201
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Chang R, An H, Li X, Zhou R, Qin J, Tian Y, Deng K. Self-healable polymer gels with multi-responsiveness of gel–sol–gel transition and degradability. Polym Chem 2017. [DOI: 10.1039/c6py02122k] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
P(NIPAM-co-FPA) contains an aldehyde group and a phenolic ester moiety is synthesized. The aldehyde group can form reversible covalent bonds with hydrazide to endow the polymer gels with self-healing properties. The self-healable polymer gel can be degraded in Na2CO3 solution based on cleavage of phenolic ester bond.
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Affiliation(s)
- Ruixue Chang
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Heng An
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Xu Li
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Ruyi Zhou
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Jianglei Qin
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Yuelan Tian
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Kuilin Deng
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
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202
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Bhargava A, Peng K, Stieg J, Mirzaeifar R, Shahab S. Focused ultrasound actuation of shape memory polymers; acoustic-thermoelastic modeling and testing. RSC Adv 2017. [DOI: 10.1039/c7ra07396h] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Controlled drug delivery (CDD) technologies have received extensive attention recently.
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Affiliation(s)
- Aarushi Bhargava
- Department of Biomedical Engineering and Mechanics
- Virginia Polytechnic Institute and State University
- Blacksburg
- USA
| | - Kaiyuan Peng
- Department of Mechanical Engineering
- Virginia Polytechnic Institute and State University
- Blacksburg
- USA
| | - Jerry Stieg
- Department of Mechanical Engineering
- Virginia Polytechnic Institute and State University
- Blacksburg
- USA
| | - Reza Mirzaeifar
- Department of Mechanical Engineering
- Virginia Polytechnic Institute and State University
- Blacksburg
- USA
| | - Shima Shahab
- Department of Biomedical Engineering and Mechanics
- Virginia Polytechnic Institute and State University
- Blacksburg
- USA
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203
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Li J, Hu W, Li C, Yang S, Wu W, Jiang H. Palladium-catalyzed cascade reaction of haloalkynes with unactivated alkenes for assembly of functionalized oxetanes. Org Chem Front 2017. [DOI: 10.1039/c6qo00633g] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A novel and efficient Pd-catalyzed intermolecular oxidative carboetherification of haloalkynes with unactivated alkenes for constructing functionalized oxetanes has been demonstrated.
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Affiliation(s)
- Jianxiao Li
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640
- China
| | - Weigao Hu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640
- China
| | - Chunsheng Li
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640
- China
| | - Shaorong Yang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640
- China
| | - Wanqing Wu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640
- China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640
- China
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204
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Amaral AJR, Pasparakis G. Stimuli responsive self-healing polymers: gels, elastomers and membranes. Polym Chem 2017. [DOI: 10.1039/c7py01386h] [Citation(s) in RCA: 110] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The development of responsive polymers with self-healing properties has expanded significantly which allow for the fabrication of complex materials in a highly controllable manner, for diverse uses in biomaterials science, electronics, sensors and actuators and coating technologies.
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205
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Park GG, Park YK, Park JK, Lee JW. Flexible and wrinkle-free electrode fabricated with polyurethane binder for lithium-ion batteries. RSC Adv 2017. [DOI: 10.1039/c7ra00800g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Flexible and wrinkle-free electrodes for lithium-ion batteries (LIBs) have been developed by using polyurethane as a binder. The electrodes provide LIBs with robust mechanical properties and good electrochemical performances along with MWNT.
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Affiliation(s)
- Geun-gyung Park
- Department of Energy Engineering
- Dankook University
- Cheonan 31116
- Republic of Korea
| | - Yang-kyu Park
- Department of Energy Engineering
- Dankook University
- Cheonan 31116
- Republic of Korea
| | - Joon-ki Park
- Department of Energy Engineering
- Dankook University
- Cheonan 31116
- Republic of Korea
| | - Jae-won Lee
- Department of Energy Engineering
- Dankook University
- Cheonan 31116
- Republic of Korea
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206
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Willocq B, Khelifa F, Brancart J, Van Assche G, Dubois P, Raquez JM. One-component Diels–Alder based polyurethanes: a unique way to self-heal. RSC Adv 2017. [DOI: 10.1039/c7ra09898g] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
In the present work, we synthesized one-component self-healing polyurethanes based on thermo-reversible furan/maleimide Diels–Alder reactions.
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Affiliation(s)
- B. Willocq
- Laboratory of Polymeric and Composite Materials (LPCM)
- Center of Innovation and Research in Materials and Polymers (CIRMAP)
- University of Mons
- B-7000 Mons
- Belgium
| | - F. Khelifa
- Laboratory of Polymeric and Composite Materials (LPCM)
- Center of Innovation and Research in Materials and Polymers (CIRMAP)
- University of Mons
- B-7000 Mons
- Belgium
| | - J. Brancart
- Physical Chemistry and Polymer Science (FYSC)
- Vrije Universiteit Brussel
- Brussels
- Belgium
| | - G. Van Assche
- Physical Chemistry and Polymer Science (FYSC)
- Vrije Universiteit Brussel
- Brussels
- Belgium
| | - Ph. Dubois
- Laboratory of Polymeric and Composite Materials (LPCM)
- Center of Innovation and Research in Materials and Polymers (CIRMAP)
- University of Mons
- B-7000 Mons
- Belgium
| | - J.-M. Raquez
- Laboratory of Polymeric and Composite Materials (LPCM)
- Center of Innovation and Research in Materials and Polymers (CIRMAP)
- University of Mons
- B-7000 Mons
- Belgium
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207
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An H, Li X, Fu X, Hu J, Lang X, Liu X, Wang Y, Wang H, Chang R, Qin J. Self-healable hydrogels with NaHCO3 degradability and a reversible gel–sol–gel transition from phenolic ester containing polymers. RSC Adv 2017. [DOI: 10.1039/c7ra05854c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Self-healable hydrogels which can be degraded by NaHCO3 were prepared. Based on the reversible properties the hydrogel showed gel–sol–gel transition under a variety of stimuli.
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Affiliation(s)
- Heng An
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Xu Li
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Xuehong Fu
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Juan Hu
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Xiaojie Lang
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Xiaoyu Liu
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Yong Wang
- College of Basic Medical Science
- Hebei University
- Baoding 071002
- China
| | - Haijun Wang
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Ruixue Chang
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Jianglei Qin
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
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208
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Wang X, Bian G, Zhang M, Chang L, Li Z, Li X, An H, Qin J, Chang R, Wang H. Self-healable hydrogels with cross-linking induced thermo-responsiveness and multi-triggered gel–sol–gel transition. Polym Chem 2017. [DOI: 10.1039/c7py00445a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Self-healable hydrogels with cross-linking induced thermo-responsiveness (CIT) were prepared from ketone-group containing P(DMA-stat-DAA).
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Affiliation(s)
- Xuemeng Wang
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Gang Bian
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Miao Zhang
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Limin Chang
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Zhiwei Li
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Xu Li
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Heng An
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Jianglei Qin
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Ruixue Chang
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Haijun Wang
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
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209
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Degirmenci I, Coote ML. UNDERSTANDING THE BEHAVIOUR OF SULPHUR-CENTRED RADICALS DURING POLYMER SELF-HEALING. JOURNAL OF THE TURKISH CHEMICAL SOCIETY, SECTION A: CHEMISTRY 2016. [DOI: 10.18596/jotcsa.287305] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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210
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John S, Joseph A, Kuruvilla M, T S. Inhibition of Mild Steel Corrosion using Chitosan–Polyvinyl Alcohol Nanocomposite Films by Sol–Gel Method: An Environmentally Friendly Approach. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/s40735-016-0062-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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211
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212
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Self-healing hyperbranched polytriazoles prepared by metal-free click polymerization of propiolate and azide monomers. Sci China Chem 2016. [DOI: 10.1007/s11426-016-0251-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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213
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Affiliation(s)
- Patrick Commins
- New York University Abu Dhabi; Abu Dhabi United Arab Emirates
| | - Hideyuki Hara
- Bruker Biospin K.K.; 3-9, Moriya, Kanagawa, Yokohama Kanagawa 221-0022 Japan
| | - Panče Naumov
- New York University Abu Dhabi; Abu Dhabi United Arab Emirates
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214
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Commins P, Hara H, Naumov P. Self-Healing Molecular Crystals. Angew Chem Int Ed Engl 2016; 55:13028-13032. [DOI: 10.1002/anie.201606003] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Patrick Commins
- New York University Abu Dhabi; Abu Dhabi United Arab Emirates
| | - Hideyuki Hara
- Bruker Biospin K.K.; 3-9, Moriya, Kanagawa, Yokohama Kanagawa 221-0022 Japan
| | - Panče Naumov
- New York University Abu Dhabi; Abu Dhabi United Arab Emirates
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215
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Huang Y, Zhu M, Huang Y, Pei Z, Li H, Wang Z, Xue Q, Zhi C. Multifunctional Energy Storage and Conversion Devices. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:8344-8364. [PMID: 27434499 DOI: 10.1002/adma.201601928] [Citation(s) in RCA: 151] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 05/27/2016] [Indexed: 05/19/2023]
Abstract
Multifunctional energy storage and conversion devices that incorporate novel features and functions in intelligent and interactive modes, represent a radical advance in consumer products, such as wearable electronics, healthcare devices, artificial intelligence, electric vehicles, smart household, and space satellites, etc. Here, smart energy devices are defined to be energy devices that are responsive to changes in configurational integrity, voltage, mechanical deformation, light, and temperature, called self-healability, electrochromism, shape memory, photodetection, and thermal responsivity. Advisable materials, device designs, and performances are crucial for the development of energy electronics endowed with these smart functions. Integrating these smart functions in energy storage and conversion devices gives rise to great challenges from the viewpoint of both understanding the fundamental mechanisms and practical implementation. Current state-of-art examples of these smart multifunctional energy devices, pertinent to materials, fabrication strategies, and performances, are highlighted. In addition, current challenges and potential solutions from materials synthesis to device performances are discussed. Finally, some important directions in this fast developing field are considered to further expand their application.
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Affiliation(s)
- Yan Huang
- Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, S.A.R., China
| | - Minshen Zhu
- Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, S.A.R., China
| | - Yang Huang
- Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, S.A.R., China
| | - Zengxia Pei
- Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, S.A.R., China
| | - Hongfei Li
- Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, S.A.R., China
| | - Zifeng Wang
- Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, S.A.R., China
| | - Qi Xue
- Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, S.A.R., China
| | - Chunyi Zhi
- Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, S.A.R., China.
- Shenzhen Research Institute, City University of Hong Kong, Shenzhen, 518000, China.
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216
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Lai JC, Mei JF, Jia XY, Li CH, You XZ, Bao Z. A Stiff and Healable Polymer Based on Dynamic-Covalent Boroxine Bonds. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:8277-8282. [PMID: 27387198 DOI: 10.1002/adma.201602332] [Citation(s) in RCA: 181] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Revised: 06/15/2016] [Indexed: 05/05/2023]
Abstract
A stiff and healable polymer is obtained by using the dynamic-covalent boroxine bond to crosslink PDMS chain into 3D networks. The as-prepared polymer is very strong and stiff, and can bear a load of more than 450 times its weight. When damaged, it can be completely healed upon heating after wetting.
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Affiliation(s)
- Jian-Cheng Lai
- State Key laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Jin-Feng Mei
- State Key laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Xiao-Yong Jia
- State Key laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
| | - Cheng-Hui Li
- State Key laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
| | - Xiao-Zeng You
- State Key laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
| | - Zhenan Bao
- State Key laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA.
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217
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Terban MW, Dabbous R, Debellis AD, Pöselt E, Billinge SJL. Structures of Hard Phases in Thermoplastic Polyurethanes. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b00889] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Maxwell W. Terban
- Department
of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
| | | | - Anthony D. Debellis
- Quantum
Chemistry and Hybrid Modeling Research, BASF Corporation, Tarrytown, New York 10591, United States
| | - Elmar Pöselt
- BASF Polyurethanes
GmbH, 49448 Lemförde, Germany
| | - Simon J. L. Billinge
- Department
of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
- Condensed
Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973 United States
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218
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Chang R, Wang X, Li X, An H, Qin J. Self-Activated Healable Hydrogels with Reversible Temperature Responsiveness. ACS APPLIED MATERIALS & INTERFACES 2016; 8:25544-25551. [PMID: 27589014 DOI: 10.1021/acsami.6b08279] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The self-healable polymer hydrogel along with reversible temperature responsiveness was prepared through self-catalyzed dynamic acylhydrazone formation and exchange without any additional stimulus or catalyst. The hydrogel was prepared from a copolymer of N-isopropylacrylamide and acylhydrazine P(NIPAM-co-AH) cross-linked by PEO dialdehyde. Besides self-healed under catalysis of acid and aniline, the hydrogel can also self-heal activated by excess of acylhydrazine groups. Without interference of catalyst during the hydrogel formation and self-healing, this kind of hydrogel prepared from biocompatible polymers can be used in more areas including biotechnology and be more persistent. The hydrogel with a large part of the PNIPAM segment also showed temperature responsiveness around body temperature influenced by the variation in group ratio. This self-healable hydrogel has great potential application in areas related to bioscience and biotechnology.
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Affiliation(s)
- Ruixue Chang
- College of Chemistry and Environmental Science, Hebei University , 180 East Wusi Road, Baoding 071002, China
| | - Xuemeng Wang
- College of Chemistry and Environmental Science, Hebei University , 180 East Wusi Road, Baoding 071002, China
| | - Xu Li
- College of Chemistry and Environmental Science, Hebei University , 180 East Wusi Road, Baoding 071002, China
| | - Heng An
- College of Chemistry and Environmental Science, Hebei University , 180 East Wusi Road, Baoding 071002, China
| | - Jianglei Qin
- College of Chemistry and Environmental Science, Hebei University , 180 East Wusi Road, Baoding 071002, China
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219
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Zheng K, Zhu X, Qian X, Li J, Yang J, Nie J. Cationic photopolymerization of 3-benzyloxymethyl-3-ethyl-oxetane. POLYM INT 2016. [DOI: 10.1002/pi.5258] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Kaijing Zheng
- State Key Laboratory of Chemical Resource Engineering; Beijing University of Chemical Technology; Beijing 100029 P.R. China
| | - Xiaoqun Zhu
- State Key Laboratory of Chemical Resource Engineering; Beijing University of Chemical Technology; Beijing 100029 P.R. China
| | - Xiaochun Qian
- Changzhou Tronly New Electronic Materials Co. Ltd; Changzhou 213000 P.R. China
| | - Jun Li
- Changzhou Tronly New Electronic Materials Co. Ltd; Changzhou 213000 P.R. China
| | - Jinliang Yang
- Changzhou Institute of Advanced Materials; Beijing University of Chemical Technology; Changzhou Jiangsu 213164 P.R. China
| | - Jun Nie
- State Key Laboratory of Chemical Resource Engineering; Beijing University of Chemical Technology; Beijing 100029 P.R. China
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220
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Lei WX, Chen XC, Hu M, Chang H, Xu H, Ren KF, Ji J. Dynamic spongy films to immobilize hydrophobic antimicrobial peptides for self-healing bactericidal coating. J Mater Chem B 2016; 4:6358-6365. [PMID: 32263537 DOI: 10.1039/c6tb01967f] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A constant increase of nosocomial infections that are caused by adhesion and colonization of pathogenic microorganisms, especially drug-resistant bacteria, on the surfaces of healthcare devices has received considerable attention worldwide. In this study, bioinspired by antimicrobial skins of natural living beings, we developed a self-healing bactericidal coating through the immobilization of hydrophobic antimicrobial peptides (AMPs) into a multilayer film, which was constructed through the enhanced exponential layer-by-layer assembly of polyethylenimine (PEI) and poly(acrylic acid) (PAA). The (PEI/PAA) film shows particular dynamic properties from the as-prepared thin solid film to a spongy microporous structure via acid solution treatment, and then back to the thin solid film by eliminating micropores via the treatment of saturated humidity. Consequently, the loading and integration of hydrophobic AMPs such as gramicidin A (GA) into the (PEI/PAA) film were achieved via simple wicking action with GA solution and subsequent humidity treatment, respectively. The GA loading densities can be precisely controlled by using different concentrations of GA solution. We demonstrated that the GA immobilized (PEI/PAA) film has rapid self-healing properties, and that Gram-positive bacteria S. aureus including the methicillin-resistant type were efficiently killed through the contact-killing mode. Collectively, this self-healing bactericidal coating shows practical potential in a variety of healthcare applications.
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Affiliation(s)
- Wen-Xi Lei
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
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221
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Bull JA, Croft RA, Davis OA, Doran R, Morgan KF. Oxetanes: Recent Advances in Synthesis, Reactivity, and Medicinal Chemistry. Chem Rev 2016; 116:12150-12233. [DOI: 10.1021/acs.chemrev.6b00274] [Citation(s) in RCA: 241] [Impact Index Per Article: 30.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- James A. Bull
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| | - Rosemary A. Croft
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| | - Owen A. Davis
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| | - Robert Doran
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| | - Kate F. Morgan
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
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222
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Liu K, Jiang X, Hunziker P. Carbohydrate-based amphiphilic nano delivery systems for cancer therapy. NANOSCALE 2016; 8:16091-16156. [PMID: 27714108 DOI: 10.1039/c6nr04489a] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Nanoparticles (NPs) are novel drug delivery systems that have been attracting more and more attention in recent years, and have been used for the treatment of cancer, infection, inflammation and other diseases. Among the numerous classes of materials employed for constructing NPs, organic polymers are outstanding due to the flexibility of design and synthesis and the ease of modification and functionalization. In particular, NP based amphiphilic polymers make a great contribution to the delivery of poorly-water soluble drugs. For example, natural, biocompatible and biodegradable products like polysaccharides are widely used as building blocks for the preparation of such drug delivery vehicles. This review will detail carbohydrate based amphiphilic polymeric systems for cancer therapy. Specifically, it focuses on the nature of the polymer employed for the preparation of targeted nanocarriers, the synthetic methods, as well as strategies for the application and evaluation of biological activity. Applications of the amphiphilic polymer systems include drug delivery, gene delivery, photosensitizer delivery, diagnostic imaging and specific ligand-assisted cellular uptake. As a result, a thorough understanding of the relationship between chemical structure and biological properties facilitate the optimal design and rational clinical application of the resulting carbohydrate based nano delivery systems for cancer therapy.
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Affiliation(s)
- Kegang Liu
- Nanomedicine Research Lab CLINAM, University Hospital Basel, Bernoullistrasse 20, Basel, CH-4056, Switzerland.
| | - Xiaohua Jiang
- Institute of Molecular Pharmacy, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Patrick Hunziker
- Nanomedicine Research Lab CLINAM, University Hospital Basel, Bernoullistrasse 20, Basel, CH-4056, Switzerland. and CLINAM Foundation for Clinical Nanomedicine, Alemannengasse 12, Basel, CH-4016, Switzerland.
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223
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Mei J, Jia X, Lai J, Sun Y, Li C, Wu J, Cao Y, You X, Bao Z. A Highly Stretchable and Autonomous Self‐Healing Polymer Based on Combination of Pt···Pt and π–π Interactions. Macromol Rapid Commun 2016; 37:1667-1675. [DOI: 10.1002/marc.201600428] [Citation(s) in RCA: 156] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 07/21/2016] [Indexed: 01/02/2023]
Affiliation(s)
- Jin‐Feng Mei
- State Key laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China
| | - Xiao‐Yong Jia
- State Key laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China
| | - Jian‐Cheng Lai
- State Key laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China
| | - Yang Sun
- State Key laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China
- National Laboratory of Solid State Microstructure Department of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China
| | - Cheng‐Hui Li
- State Key laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China
| | - Jun‐Hua Wu
- National Laboratory of Solid State Microstructure Department of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China
| | - Yi Cao
- National Laboratory of Solid State Microstructure Department of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China
| | - Xiao‐Zeng You
- State Key laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China
| | - Zhenan Bao
- Department of Chemical Engineering Stanford University Stanford CA 94305 USA
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224
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Guo W, Jia Y, Tian K, Xu Z, Jiao J, Li R, Wu Y, Cao L, Wang H. UV-Triggered Self-Healing of a Single Robust SiO2 Microcapsule Based on Cationic Polymerization for Potential Application in Aerospace Coatings. ACS APPLIED MATERIALS & INTERFACES 2016; 8:21046-21054. [PMID: 27463101 DOI: 10.1021/acsami.6b06091] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
UV-triggered self-healing of single microcapsules has been a good candidate to enhance the life of polymer-based aerospace coatings because of its rapid healing process and healing chemistry based on an accurate stoichiometric ratio. However, free radical photoinitiators used in single microcapsules commonly suffer from possible deactivation due to the presence of oxygen in the space environment. Moreover, entrapment of polymeric microcapsules into coatings often involves elevated temperature or a strong solvent, probably leading to swelling or degradation of polymer shell, and ultimately the loss of active healing species into the host matrix. We herein describe the first single robust SiO2 microcapsule self-healing system based on UV-triggered cationic polymerization for potential application in aerospace coatings. On the basis of the similarity of solubility parameters of the active healing species and the SiO2 precursor, the epoxy resin and cationic photoinitiator are successfully encapsulated into a single SiO2 microcapsule via a combined interfacial/in situ polymerization. The single SiO2 microcapsule shows solvent resistance and thermal stability, especially a strong resistance for thermal cycling in a simulated space environment. In addition, the up to 89% curing efficiency of the epoxy resin in 30 min, and the obvious filling of scratches in the epoxy matrix demonstrate the excellent UV-induced healing performance of SiO2 microcapsules, attributed to a high load of healing species within the capsule (up to 87 wt %) and healing chemistry based on an accurate stoichiometric ratio of the photoinitiator and epoxy resin at 9/100. More importantly, healing chemistry based on a UV-triggered cationic polymerization mechanism is not sensitive to oxygen, extremely facilitating future embedment of this single SiO2 microcapsule in spacecraft coatings to achieve self-healing in a space environment with abundant UV radiation and oxygen.
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Affiliation(s)
- Wanchun Guo
- Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University , Qinhuangdao, Hebei 066004, China
| | - Yin Jia
- Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University , Qinhuangdao, Hebei 066004, China
| | - Kesong Tian
- Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University , Qinhuangdao, Hebei 066004, China
| | - Zhaopeng Xu
- Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province, School of Information Science and Engineering, Yanshan University , Qinhuangdao, Hebei 066004, China
| | - Jiao Jiao
- Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University , Qinhuangdao, Hebei 066004, China
| | - Ruifei Li
- Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University , Qinhuangdao, Hebei 066004, China
| | - Yuehao Wu
- Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University , Qinhuangdao, Hebei 066004, China
| | - Ling Cao
- Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University , Qinhuangdao, Hebei 066004, China
| | - Haiyan Wang
- Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University , Qinhuangdao, Hebei 066004, China
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225
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Jin K, Li L, Torkelson JM. Recyclable Crosslinked Polymer Networks via One-Step Controlled Radical Polymerization. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:6746-50. [PMID: 27206061 DOI: 10.1002/adma.201600871] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Revised: 04/17/2016] [Indexed: 05/19/2023]
Abstract
A nitroxide-mediated polymerization strategy allows one-step synthesis of recyclable crosslinked polymeric materials from any monomers or polymers that contain carbon-carbon double bonds amenable to radical polymerization. The resulting materials with dynamic covalent bonds can show full property recovery after multiple melt-reprocessing recycles. This one-step strategy provides for both robust, relatively sustainable recyclability of crosslinked polymers and design of networks for advanced technologies.
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Affiliation(s)
- Kailong Jin
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Lingqiao Li
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - John M Torkelson
- Department of Chemical and Biological Engineering, Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
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226
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Wang W, Liu Y, Leng J. Recent developments in shape memory polymer nanocomposites: Actuation methods and mechanisms. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.03.007] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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227
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Kathan M, Kovaříček P, Jurissek C, Senf A, Dallmann A, Thünemann AF, Hecht S. Control of Imine Exchange Kinetics with Photoswitches to Modulate Self-Healing in Polysiloxane Networks by Light Illumination. Angew Chem Int Ed Engl 2016; 55:13882-13886. [PMID: 27391109 DOI: 10.1002/anie.201605311] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Indexed: 12/12/2022]
Abstract
Various aldehyde-containing photoswitches have been developed whose reactivity toward amines can be controlled externally. A thermally stable bifunctional diarylethene, which in its ring-closed form exhibits imine formation accelerated by one order of magnitude, was used as a photoswitchable crosslinker and mixed with a commercially available amino-functionalized polysiloxane to yield a rubbery material with viscoelastic and self-healing properties that can be reversibly tuned by irradiation.
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Affiliation(s)
- Michael Kathan
- Department of Chemistry & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor Strasse 2, 12489, Berlin, Germany
| | - Petr Kovaříček
- Department of Chemistry & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor Strasse 2, 12489, Berlin, Germany
| | - Christoph Jurissek
- Department of Chemistry & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor Strasse 2, 12489, Berlin, Germany
| | - Antti Senf
- Department of Chemistry & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor Strasse 2, 12489, Berlin, Germany
| | - Andre Dallmann
- Department of Chemistry & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor Strasse 2, 12489, Berlin, Germany
| | - Andreas F Thünemann
- Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205, Berlin, Germany
| | - Stefan Hecht
- Department of Chemistry & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor Strasse 2, 12489, Berlin, Germany.
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228
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Kathan M, Kovaříček P, Jurissek C, Senf A, Dallmann A, Thünemann AF, Hecht S. Kontrolle der Kinetik von Iminaustauschreaktionen mit Photoschaltern zur lichtgesteuerten Modulation der Selbstheilung in Polysiloxannetzwerken. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605311] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Michael Kathan
- Department of Chemistry & IRIS Adlershof; Humboldt-Universität zu Berlin; Brook-Taylor Straße 2 12489 Berlin Deutschland
| | - Petr Kovaříček
- Department of Chemistry & IRIS Adlershof; Humboldt-Universität zu Berlin; Brook-Taylor Straße 2 12489 Berlin Deutschland
| | - Christoph Jurissek
- Department of Chemistry & IRIS Adlershof; Humboldt-Universität zu Berlin; Brook-Taylor Straße 2 12489 Berlin Deutschland
| | - Antti Senf
- Department of Chemistry & IRIS Adlershof; Humboldt-Universität zu Berlin; Brook-Taylor Straße 2 12489 Berlin Deutschland
| | - Andre Dallmann
- Department of Chemistry & IRIS Adlershof; Humboldt-Universität zu Berlin; Brook-Taylor Straße 2 12489 Berlin Deutschland
| | - Andreas F. Thünemann
- Bundesanstalt für Materialforschung und -prüfung; Unter den Eichen 87 12205 Berlin Deutschland
| | - Stefan Hecht
- Department of Chemistry & IRIS Adlershof; Humboldt-Universität zu Berlin; Brook-Taylor Straße 2 12489 Berlin Deutschland
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229
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Feula A, Tang X, Giannakopoulos I, Chippindale AM, Hamley IW, Greco F, Paul Buckley C, Siviour CR, Hayes W. An adhesive elastomeric supramolecular polyurethane healable at body temperature. Chem Sci 2016; 7:4291-4300. [PMID: 30090288 PMCID: PMC6054028 DOI: 10.1039/c5sc04864h] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 03/14/2016] [Indexed: 01/23/2023] Open
Abstract
In this paper, we report the synthesis and healing ability of a non-cytotoxic supramolecular polyurethane network whose mechanical properties can be recovered efficiently (>99%) at the temperature of the human body (37 °C). Rheological analysis revealed an acceleration in the drop of the storage modulus above 37 °C, on account of the dissociation of the supramolecular polyurethane network, and this decrease in viscosity enables the efficient recovery of the mechanical properties. Microscopic and mechanical characterisation has shown that this material is able to recover mechanical properties across a damage site with minimal contact required between the interfaces and also demonstrated that the mechanical properties improved when compared to other low temperature healing elastomers or gel-like materials. The supramolecular polyurethane was found to be non-toxic in a cytotoxicity assay carried out in human skin fibroblasts (cell viability > 94% and non-significantly different compared to the untreated control). This supramolecular network material also exhibited excellent adhesion to pig skin and could be healed completely in situ post damage indicating that biomedical applications could be targeted, such as artificial skin or wound dressings with supramolecular materials of this type.
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Affiliation(s)
- Antonio Feula
- Department of Chemistry , University of Reading , Whiteknights , Reading , RG6 6AD , UK .
| | - Xuegang Tang
- Department of Engineering Science , Oxford University , Parks Road , Oxford , OX1 3PJ , UK
| | - Ioannis Giannakopoulos
- Department of Engineering Science , Oxford University , Parks Road , Oxford , OX1 3PJ , UK
| | - Ann M Chippindale
- Department of Chemistry , University of Reading , Whiteknights , Reading , RG6 6AD , UK .
| | - Ian W Hamley
- Department of Chemistry , University of Reading , Whiteknights , Reading , RG6 6AD , UK .
| | - Francesca Greco
- Reading School of Pharmacy , University of Reading , Whiteknights , Reading , RG6 6AD , UK
| | - C Paul Buckley
- Department of Engineering Science , Oxford University , Parks Road , Oxford , OX1 3PJ , UK
| | - Clive R Siviour
- Department of Engineering Science , Oxford University , Parks Road , Oxford , OX1 3PJ , UK
| | - Wayne Hayes
- Department of Chemistry , University of Reading , Whiteknights , Reading , RG6 6AD , UK .
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230
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Yu L, Xu K, Ge L, Wan W, Darabi A, Xing M, Zhong W. Cytocompatible, Photoreversible, and Self-Healing Hydrogels for Regulating Bone Marrow Stromal Cell Differentiation. Macromol Biosci 2016; 16:1381-90. [DOI: 10.1002/mabi.201500457] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 02/02/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Lianlian Yu
- Department of Biosystem Engineering; University of Manitoba; Winnipeg MB R3T 2N2 Canada
| | - Kaige Xu
- Department of Mechanical Engineering; University of Manitoba; Winnipeg MB R3T 2N2 Canada
| | - Liangpeng Ge
- Department of Mechanical Engineering; University of Manitoba; Winnipeg MB R3T 2N2 Canada
| | - Wenbing Wan
- Department of Mechanical Engineering; University of Manitoba; Winnipeg MB R3T 2N2 Canada
| | - Ali Darabi
- Department of Mechanical Engineering; University of Manitoba; Winnipeg MB R3T 2N2 Canada
| | - Malcolm Xing
- Department of Mechanical Engineering; University of Manitoba; Winnipeg MB R3T 2N2 Canada
- Manitoba Institute of Child Health; Winnipeg MB R3T 2N2 Canada
- Department of Biochemistry and Medical Genetics; University of Manitoba; Winnipeg MB R3T 2N2 Canada
| | - Wen Zhong
- Department of Biosystem Engineering; University of Manitoba; Winnipeg MB R3T 2N2 Canada
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231
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232
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Roy N, Tomović Ž, Buhler E, Lehn JM. An Easily Accessible Self-Healing Transparent Film Based on a 2D Supramolecular Network of Hydrogen-Bonding Interactions between Polymeric Chains. Chemistry 2016; 22:13513-20. [DOI: 10.1002/chem.201601378] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Nabarun Roy
- ISIS; Université de Strasbourg, 8; allée Gaspard Monge 67000 Strasbourg France
- BASF Polyurethanes GmbH; 60 Elastogranstrasse 49448 Lemförde Germany
| | - Željko Tomović
- BASF Polyurethanes GmbH; 60 Elastogranstrasse 49448 Lemförde Germany
| | - Eric Buhler
- Matière et Systèmes Complexes (MSC) Laboratory; UMR CNRS 7057; University Paris Diderot-Paris 7, Sorbonne Paris Cité, Bâtiment Condorcet; 75205 Paris cedex 13 France
| | - Jean-Marie Lehn
- ISIS; Université de Strasbourg, 8; allée Gaspard Monge 67000 Strasbourg France
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233
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Autonomous self-healing structural composites with bio-inspired design. Sci Rep 2016; 6:25059. [PMID: 27146382 PMCID: PMC4857079 DOI: 10.1038/srep25059] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Accepted: 04/08/2016] [Indexed: 11/19/2022] Open
Abstract
Strong and tough natural composites such as bone, silk or nacre are often built from stiff blocks bound together using thin interfacial soft layers that can also provide sacrificial bonds for self-repair. Here we show that it is possible exploit this design in order to create self-healing structural composites by using thin supramolecular polymer interfaces between ceramic blocks. We have built model brick-and-mortar structures with ceramic contents above 95 vol% that exhibit strengths of the order of MPa (three orders of magnitude higher than the interfacial polymer) and fracture energies that are two orders of magnitude higher than those of the glass bricks. More importantly, these properties can be fully recovered after fracture without using external stimuli or delivering healing agents. This approach demonstrates a very promising route towards the design of strong, ideal self-healing materials able to self-repair repeatedly without degradation or external stimuli.
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234
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Jia XY, Mei JF, Lai JC, Li CH, You XZ. A Highly Stretchable Polymer that Can Be Thermally Healed at Mild Temperature. Macromol Rapid Commun 2016; 37:952-6. [DOI: 10.1002/marc.201600142] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 04/02/2016] [Indexed: 01/25/2023]
Affiliation(s)
- Xiao-Yong Jia
- State Key Laboratory of Coordination Chemistry; School of Chemistry and Chemical Engineering; Collaborative Innovation Centre of Advanced Microstructures; Nanjing University; Nanjing 210093 P. R. China
| | - Jin-Feng Mei
- State Key Laboratory of Coordination Chemistry; School of Chemistry and Chemical Engineering; Collaborative Innovation Centre of Advanced Microstructures; Nanjing University; Nanjing 210093 P. R. China
| | - Jian-Cheng Lai
- State Key Laboratory of Coordination Chemistry; School of Chemistry and Chemical Engineering; Collaborative Innovation Centre of Advanced Microstructures; Nanjing University; Nanjing 210093 P. R. China
| | - Cheng-Hui Li
- State Key Laboratory of Coordination Chemistry; School of Chemistry and Chemical Engineering; Collaborative Innovation Centre of Advanced Microstructures; Nanjing University; Nanjing 210093 P. R. China
| | - Xiao-Zeng You
- State Key Laboratory of Coordination Chemistry; School of Chemistry and Chemical Engineering; Collaborative Innovation Centre of Advanced Microstructures; Nanjing University; Nanjing 210093 P. R. China
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235
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A highly stretchable autonomous self-healing elastomer. Nat Chem 2016; 8:618-24. [PMID: 27219708 DOI: 10.1038/nchem.2492] [Citation(s) in RCA: 675] [Impact Index Per Article: 84.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 03/03/2016] [Indexed: 12/22/2022]
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236
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Tao Y, Hasan A, Deeb G, Hu C, Han H. Rheological and Mechanical Behavior of Silk Fibroin Reinforced Waterborne Polyurethane. Polymers (Basel) 2016; 8:E94. [PMID: 30979186 PMCID: PMC6432601 DOI: 10.3390/polym8030094] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Revised: 03/01/2016] [Accepted: 03/03/2016] [Indexed: 11/16/2022] Open
Abstract
Waterborne polyurethane (WPU) is a versatile and environment-friendly material with growing applications in both industry and academia. Silk fibroin (SF) is an attractive material known for its structural, biological and hemocompatible properties. The SF reinforced waterborne polyurethane (WPU) is a promising scaffold material for tissue engineering applications. In this work, we report synthesis and characterization of a novel nanocomposite using SF reinforced WPU. The rheological behaviors of WPU and WPU-SF dispersions with different solid contents were investigated with steady shear and dynamic oscillatory tests to evaluate the formation of the cross-linked gel structure. The average particle size and the zeta potential of WPU-SF dispersions with different SF content were examined at 25 °C to investigate the interaction between SF and WPU. FTIR, SEM, TEM and tensile testing were performed to study the effects of SF content on the structural morphology and mechanical properties of the resultant composite films. Experimental results revealed formation of gel network in the WPU dispersions at solid contents more than 17 wt %. The conjugate reaction between the WPU and SF as well as the hydrogen bond between them helped in dispersing the SF powder into the WPU matrix as small aggregates. Addition of SF to the WPU also improved the Young's modulus from 0.30 to 3.91 MPa, tensile strength from 0.56 to 8.94 MPa, and elongation at break from 1067% to 2480%, as SF was increased up to 5 wt %. Thus, significant strengthening and toughening can be achieved by introducing SF powder into the WPU formulations.
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Affiliation(s)
- Yongzhen Tao
- Key Laboratory of Green Processing and Functional Textiles of New Textile Materials, Ministry of Education, Wuhan Textile University, Wuhan 430073, China.
| | - Anwarul Hasan
- Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, Doha 2713, Qatar.
- Biomedical Engineering, and Department of Mechanical Engineering, Faculty of Engineering and Architecture, American University of Beirut, Beirut 1107 2020, Lebanon.
- Biomaterials Innovation Research Center, Division of Biomedical Engineering, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA 02139, USA.
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
| | - George Deeb
- Biomedical Engineering, and Department of Mechanical Engineering, Faculty of Engineering and Architecture, American University of Beirut, Beirut 1107 2020, Lebanon.
| | - Changkai Hu
- Key Laboratory of Green Processing and Functional Textiles of New Textile Materials, Ministry of Education, Wuhan Textile University, Wuhan 430073, China.
| | - Huipeng Han
- Key Laboratory of Green Processing and Functional Textiles of New Textile Materials, Ministry of Education, Wuhan Textile University, Wuhan 430073, China.
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237
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Wang J, Kaplan JA, Colson YL, Grinstaff MW. Stretch-Induced Drug Delivery from Superhydrophobic Polymer Composites: Use of Crack Propagation Failure Modes for Controlling Release Rates. Angew Chem Int Ed Engl 2016; 55:2796-800. [PMID: 26804182 PMCID: PMC4899983 DOI: 10.1002/anie.201511052] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Indexed: 12/14/2022]
Abstract
The concept of using crack propagation in polymeric materials to control drug release and its first demonstration are reported. The composite drug delivery system consists of highly-textured superhydrophobic electrosprayed microparticle coatings, composed of biodegradable and biocompatible polymers poly(caprolactone) and poly(glycerol monostearate carbonate-co-caprolactone), and a cellulose/polyester core. The release of entrapped agents is controlled by the magnitude of applied strain, resulting in a graded response from water infiltration through the propagating patterned cracks in the coating. Strain-dependent delivery of the anticancer agents cisplatin and 7-ethyl-10-hydroxycamptothecin to esophageal cancer cells (OE33) in vitro is observed. Finally the device is integrated with an esophageal stent to demonstrate delivery of fluorescein diacetate, using applied tension, to an ex vivo esophagus.
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Affiliation(s)
- Julia Wang
- Departments of Biomedical Engineering and Chemistry, Boston University, Boston, MA, 02215, USA
| | - Jonah A Kaplan
- Departments of Biomedical Engineering and Chemistry, Boston University, Boston, MA, 02215, USA
| | - Yolonda L Colson
- Division of Thoracic Surgery, Department of Surgery, Brigham and Women's Hospital, Boston, MA, 02115, USA
| | - Mark W Grinstaff
- Departments of Biomedical Engineering and Chemistry, Boston University, Boston, MA, 02215, USA.
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238
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Yin MJ, Yao M, Gao S, Zhang AP, Tam HY, Wai PKA. Rapid 3D Patterning of Poly(acrylic acid) Ionic Hydrogel for Miniature pH Sensors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:1394-1399. [PMID: 26643765 DOI: 10.1002/adma.201504021] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 10/20/2015] [Indexed: 06/05/2023]
Abstract
Poly(acrylic acid) (PAA), as a highly ionic conductive hydrogel, can reversibly swell/deswell according to the surrounding pH conditions. An optical maskless -stereolithography technology is presented to rapidly 3D pattern PAA for device fabrication. A highly sensitive miniature pH sensor is demonstrated by in situ printing of periodic PAA micropads on a tapered optical microfiber.
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Affiliation(s)
- Ming-Jie Yin
- Photonics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, SAR, China
| | - Mian Yao
- Photonics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, SAR, China
- Photonics Research Center, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, SAR, China
| | - Shaorui Gao
- Photonics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, SAR, China
| | - A Ping Zhang
- Photonics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, SAR, China
| | - Hwa-Yaw Tam
- Photonics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, SAR, China
| | - Ping-Kong A Wai
- Photonics Research Center, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, SAR, China
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239
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Wang J, Kaplan JA, Colson YL, Grinstaff MW. Stretch‐Induced Drug Delivery from Superhydrophobic Polymer Composites: Use of Crack Propagation Failure Modes for Controlling Release Rates. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201511052] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Julia Wang
- Departments of Biomedical Engineering and Chemistry Boston University Boston MA 02215 USA
| | - Jonah A. Kaplan
- Departments of Biomedical Engineering and Chemistry Boston University Boston MA 02215 USA
| | - Yolonda L. Colson
- Division of Thoracic Surgery Department of Surgery Brigham and Women's Hospital Boston MA 02115 USA
| | - Mark W. Grinstaff
- Departments of Biomedical Engineering and Chemistry Boston University Boston MA 02215 USA
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240
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Hia IL, Vahedi V, Pasbakhsh P. Self-Healing Polymer Composites: Prospects, Challenges, and Applications. POLYM REV 2016. [DOI: 10.1080/15583724.2015.1106555] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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241
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Scheiner M, Dickens TJ, Okoli O. Progress towards self-healing polymers for composite structural applications. POLYMER 2016. [DOI: 10.1016/j.polymer.2015.11.008] [Citation(s) in RCA: 100] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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242
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Yang Y, Urbas A, Gonzalez-Bonet A, Sheridan RJ, Seppala JE, Beers KL, Sun J. A composition-controlled cross-linking resin network through rapid visible-light photo-copolymerization. Polym Chem 2016. [DOI: 10.1039/c6py00606j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
This work introduces a cross-linked resin network with controlled chemical composition, a clinically practical procedure to make it in situ, and appropriate analytical tools for chemical structure and kinetic studies.
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Affiliation(s)
- Yin Yang
- Dr. Anthony Volpe Research Center
- American Dental Association Foundation
- National Institute of Standards and Technology
- Gaithersburg
- USA
| | - Aaron Urbas
- Biosystems and Biomaterials Division
- Materials and Measurement Laboratory
- National Institute of Standards and Technology
- Gaithersburg
- USA
| | - Andres Gonzalez-Bonet
- Dr. Anthony Volpe Research Center
- American Dental Association Foundation
- National Institute of Standards and Technology
- Gaithersburg
- USA
| | - Richard J. Sheridan
- Materials Science and Engineering Division
- Materials and Measurement Laboratory
- National Institute of Standards and Technology
- Gaithersburg
- USA
| | - Jonathan E. Seppala
- Materials Science and Engineering Division
- Materials and Measurement Laboratory
- National Institute of Standards and Technology
- Gaithersburg
- USA
| | - Kathryn L. Beers
- Materials Science and Engineering Division
- Materials and Measurement Laboratory
- National Institute of Standards and Technology
- Gaithersburg
- USA
| | - Jirun Sun
- Dr. Anthony Volpe Research Center
- American Dental Association Foundation
- National Institute of Standards and Technology
- Gaithersburg
- USA
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243
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Karimata A, Matsumoto K, Endo T. Synthesis and characterization of polyurethanes bearing carbosilane segments. RSC Adv 2016. [DOI: 10.1039/c6ra19352h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
New polyurethanes bearing carbosilane segment (1a–c) were synthesized and found to exhibit lower glass transition temperature and storage moduli than corresponding reference polyurethanes 2a–c, while thermal stability was retained.
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Affiliation(s)
- Ayumu Karimata
- Molecular Engineering Institute
- Kindai University
- Iizuka
- Japan
| | - Kozo Matsumoto
- Molecular Engineering Institute
- Kindai University
- Iizuka
- Japan
- Department of Biological & Environmental Chemistry
| | - Takeshi Endo
- Molecular Engineering Institute
- Kindai University
- Iizuka
- Japan
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244
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Huang Y, Zhong M, Huang Y, Zhu M, Pei Z, Wang Z, Xue Q, Xie X, Zhi C. A self-healable and highly stretchable supercapacitor based on a dual crosslinked polyelectrolyte. Nat Commun 2015; 6:10310. [PMID: 26691661 PMCID: PMC4703889 DOI: 10.1038/ncomms10310] [Citation(s) in RCA: 282] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 11/27/2015] [Indexed: 12/22/2022] Open
Abstract
Superior self-healability and stretchability are critical elements for the practical wide-scale adoption of personalized electronics such as portable and wearable energy storage devices. However, the low healing efficiency of self-healable supercapacitors and the small strain of stretchable supercapacitors are fundamentally limited by conventional polyvinyl alcohol-based acidic electrolytes, which are intrinsically neither self-healable nor highly stretchable. Here we report an electrolyte comprising polyacrylic acid dual crosslinked by hydrogen bonding and vinyl hybrid silica nanoparticles, which displays all superior functions and provides a solution to the intrinsic self-healability and high stretchability problems of a supercapacitor. Supercapacitors with this electrolyte are non-autonomic self-healable, retaining the capacitance completely even after 20 cycles of breaking/healing. These supercapacitors are stretched up to 600% strain with enhanced performance using a designed facile electrode fabrication procedure.
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Affiliation(s)
- Yan Huang
- Department of Physics and Materials Science, City University of Hong Kong, Hong Kong 999077, China
| | - Ming Zhong
- Laboratory of Advanced Materials (MOE), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Yang Huang
- Department of Physics and Materials Science, City University of Hong Kong, Hong Kong 999077, China
| | - Minshen Zhu
- Department of Physics and Materials Science, City University of Hong Kong, Hong Kong 999077, China
| | - Zengxia Pei
- Department of Physics and Materials Science, City University of Hong Kong, Hong Kong 999077, China
| | - Zifeng Wang
- Department of Physics and Materials Science, City University of Hong Kong, Hong Kong 999077, China
| | - Qi Xue
- Department of Physics and Materials Science, City University of Hong Kong, Hong Kong 999077, China
| | - Xuming Xie
- Laboratory of Advanced Materials (MOE), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Chunyi Zhi
- Department of Physics and Materials Science, City University of Hong Kong, Hong Kong 999077, China
- Shenzhen Research Institute, City University of Hong Kong, Shenzhen 518000, China
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245
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Ji S, Cao W, Yu Y, Xu H. Visible-Light-Induced Self-Healing Diselenide-Containing Polyurethane Elastomer. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:7740-7745. [PMID: 26484966 DOI: 10.1002/adma.201503661] [Citation(s) in RCA: 183] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 08/30/2015] [Indexed: 06/05/2023]
Abstract
Visible light is an easily achievable and mild trigger for self-healing materials. By incorporating dynamic diselenide bonds into polyurethane, visible-light-induced self-healing materials can be fabricated. Besides mild visible light, the healing process can also be realized using directional laser irradiation, which makes the system a remotely controllable self-healing system.
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Affiliation(s)
- Shaobo Ji
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Wei Cao
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Ying Yu
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Huaping Xu
- Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
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246
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Zheng J, Xiao P, Liu W, Zhang J, Huang Y, Chen T. Mechanical Robust and Self-Healable Supramolecular Hydrogel. Macromol Rapid Commun 2015; 37:265-70. [DOI: 10.1002/marc.201500571] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 11/09/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Jing Zheng
- Division of Polymer and Composite Materials; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Science; Ningbo 315201 P. R. China
| | - Peng Xiao
- Division of Polymer and Composite Materials; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Science; Ningbo 315201 P. R. China
| | - Wei Liu
- Division of Polymer and Composite Materials; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Science; Ningbo 315201 P. R. China
| | - Jiawei Zhang
- Division of Polymer and Composite Materials; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Science; Ningbo 315201 P. R. China
| | - Youju Huang
- Division of Polymer and Composite Materials; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Science; Ningbo 315201 P. R. China
| | - Tao Chen
- Division of Polymer and Composite Materials; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Science; Ningbo 315201 P. R. China
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247
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Gao L, He J, Hu J, Wang C. Photoresponsive Self-Healing Polymer Composite with Photoabsorbing Hybrid Microcapsules. ACS APPLIED MATERIALS & INTERFACES 2015; 7:25546-25552. [PMID: 26509429 DOI: 10.1021/acsami.5b09121] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Microcapsule-based self-healing polymer materials are highly desirable because they can heal large-volume cracks without changing the original chemical structures of polymers. However, they are limited by processing difficulties and inhomogeneous distributions of two components. Herein, we report a one-component photoresponsive self-healing polymer composite with photoabsorbing hybrid microcapsules (PAHM), which gives the microcapsules photoabsorbing properties by introducing nano-TiO2 particles as photoabsorbing and emulsified agents in the poly(urea-formaldehyde)/TiO2 hybrid shells. Upon mechanical damage and then exposure to light, the photoresponsive healing agents in the cracks will be solidified to allow for self-healing, while the healing agents in the unbroken PAHM will be protected and remain unreacted, which endows this photoresponsive microcapsule-based self-healing composite with self-healing properties like those found in the conventional two-component microcapsule-based systems. Given the universality of this hybrid polymerization method, incorporation of the photoabsorbing particles to conventional polymer shells may further broaden the scope of applications of these widely used materials.
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Affiliation(s)
- Lei Gao
- The State Key Lab of Power System, Department of Electrical Engineering, Tsinghua University , Beijing 100084, P.R. China
| | - Jinliang He
- The State Key Lab of Power System, Department of Electrical Engineering, Tsinghua University , Beijing 100084, P.R. China
| | - Jun Hu
- The State Key Lab of Power System, Department of Electrical Engineering, Tsinghua University , Beijing 100084, P.R. China
| | - Chao Wang
- Department of Chemical Engineering, Stanford University , Stanford, California 94305, United States
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248
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Photo-healable ion gel with improved mechanical properties using a tetra-arm diblock copolymer containing azobenzene groups. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.09.058] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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249
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Bharti B, Fameau AL, Rubinstein M, Velev OD. Nanocapillarity-mediated magnetic assembly of nanoparticles into ultraflexible filaments and reconfigurable networks. NATURE MATERIALS 2015; 14:1104-9. [PMID: 26237128 PMCID: PMC4816044 DOI: 10.1038/nmat4364] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 06/26/2015] [Indexed: 05/17/2023]
Abstract
The fabrication of multifunctional materials with tunable structure and properties requires programmed binding of their building blocks. For example, particles organized in long-ranged structures by external fields can be bound permanently into stiff chains through electrostatic or van der Waals attraction, or into flexible chains through soft molecular linkers such as surface-grafted DNA or polymers. Here, we show that capillarity-mediated binding between magnetic nanoparticles coated with a liquid lipid shell can be used for the assembly of ultraflexible microfilaments and network structures. These filaments can be magnetically regenerated on mechanical damage, owing to the fluidity of the capillary bridges between nanoparticles and their reversible binding on contact. Nanocapillary forces offer opportunities for assembling dynamically reconfigurable multifunctional materials that could find applications as micromanipulators, microbots with ultrasoft joints, or magnetically self-repairing gels.
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Affiliation(s)
- Bhuvnesh Bharti
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, USA
| | - Anne-Laure Fameau
- National Institute of French Agricultural Research, Nantes 44300, France
| | - Michael Rubinstein
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, USA
| | - Orlin D. Velev
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, USA
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250
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Ying H, Zhang Y, Cheng J. Dynamic urea bond for the design of reversible and self-healing polymers. Nat Commun 2015; 5:3218. [PMID: 24492620 PMCID: PMC4438999 DOI: 10.1038/ncomms4218] [Citation(s) in RCA: 447] [Impact Index Per Article: 49.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 01/08/2014] [Indexed: 01/06/2023] Open
Abstract
Polymers bearing dynamic covalent bonds may exhibit dynamic properties, such as self-healing, shape memory and environmental adaptation. However, most dynamic covalent chemistries developed so far require either catalyst or change of environmental conditions to facilitate bond reversion and dynamic property change in bulk materials. Here we report the rational design of hindered urea bonds (urea with bulky substituent attached to its nitrogen) and the use of them to make polyureas and poly(urethane-ureas) capable of catalyst-free dynamic property change and autonomous repairing at low temperature. Given the simplicity of the hindered urea bond chemistry (reaction of a bulky amine with an isocyanate), incorporation of the catalyst-free dynamic covalent urea bonds to conventional polyurea or urea-containing polymers that typically have stable bulk properties may further broaden the scope of applications of these widely used materials.
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Affiliation(s)
- Hanze Ying
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, USA
| | - Yanfeng Zhang
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, USA
| | - Jianjun Cheng
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, USA
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