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Zhang J, Jiang C, Deng G, Luo M, Ye B, Zhang H, Miao M, Li T, Zhang D. Closed-loop recycling of tough epoxy supramolecular thermosets constructed with hyperbranched topological structure. Nat Commun 2024; 15:4869. [PMID: 38849328 PMCID: PMC11161517 DOI: 10.1038/s41467-024-49272-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Accepted: 05/23/2024] [Indexed: 06/09/2024] Open
Abstract
The regulation of topological structure of covalent adaptable networks (CANs) remains a challenge for epoxy CANs. Here, we report a strategy to develop strong and tough epoxy supramolecular thermosets with rapid reprocessability and room-temperature closed-loop recyclability. These thermosets were constructed from vanillin-based hyperbranched epoxy resin (VanEHBP) through the introduction of intermolecular hydrogen bonds and dual dynamic covalent bonds, as well as the formation of intramolecular and intermolecular cavities. The supramolecular structures confer remarkable energy dissipation capability of thermosets, leading to high toughness and strength. Due to the dynamic imine exchange and reversible noncovalent crosslinks, the thermosets can be rapidly and effectively reprocessed at 120 °C within 30 s. Importantly, the thermosets can be efficiently depolymerized at room temperature, and the recovered materials retain the structural integrity and mechanical properties of the original samples. This strategy may be employed to design tough, closed-loop recyclable epoxy thermosets for practical applications.
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Affiliation(s)
- Junheng Zhang
- Hubei R&D Center of Hyperbranched Polymers Synthesis and Applications, South-Central Minzu University, Wuhan, 430074, China.
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, 515200, China.
| | - Can Jiang
- Hubei R&D Center of Hyperbranched Polymers Synthesis and Applications, South-Central Minzu University, Wuhan, 430074, China
| | - Guoyan Deng
- Hubei R&D Center of Hyperbranched Polymers Synthesis and Applications, South-Central Minzu University, Wuhan, 430074, China
| | - Mi Luo
- State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, 230026, China
| | - Bangjiao Ye
- State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, 230026, China
| | - Hongjun Zhang
- State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, 230026, China.
| | - Menghe Miao
- Department of Mechanical Engineering, The University of Melbourne, Grattan Street, Parkville, Victoria, 3010, Australia
| | - Tingcheng Li
- Hubei R&D Center of Hyperbranched Polymers Synthesis and Applications, South-Central Minzu University, Wuhan, 430074, China
| | - Daohong Zhang
- Hubei R&D Center of Hyperbranched Polymers Synthesis and Applications, South-Central Minzu University, Wuhan, 430074, China.
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Yang T, Lu X, Wang X, Wei X, An N, Li Y, Wang W, Li X, Fang X, Sun J. Upcycling of Carbon Fiber/Thermoset Composites into High-Performance Elastomers and Repurposed Carbon Fibers. Angew Chem Int Ed Engl 2024; 63:e202403972. [PMID: 38491769 DOI: 10.1002/anie.202403972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 03/15/2024] [Accepted: 03/15/2024] [Indexed: 03/18/2024]
Abstract
Recycling of carbon fiber-reinforced polymer composites (CFRCs) based on thermosetting plastics is difficult. In the present study, high-performance CFRCs are fabricated through complexation of aromatic pinacol-cross-linked polyurethane (PU-AP) thermosets with carbon fiber (CF) cloths. PU-AP thermosets exhibit a breaking strength of 95.5 MPa and toughness of 473.6 MJ m-3 and contain abundant hydrogen-bonding groups, which can have strong adhesion with CFs. Because of the high interfacial adhesion between CF cloths and PU-AP thermosets and high toughness of PU-AP thermosets, CF/PU-AP composites possess a high tensile strength of >870 MPa. Upon heating in N,N-dimethylacetamide (DMAc) at 100 °C, the aromatic pinacols in the CF/PU-AP composites can be cleaved, generating non-destructive CF cloths and linear polymers that can be converted to high-performance elastomers. The elastomers are mechanically robust, healable, reprocessable, and damage-resistant with an extremely high tensile strength of 74.2 MPa and fracture energy of 149.6 kJ m-2. As a result, dissociation of CF/PU-AP composites enables the recovery of reusable CF cloths and high-performance elastomers, thus realizing the upcycling of CF/PU-AP composites.
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Affiliation(s)
- Tiantian Yang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Xingyuan Lu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Xiaohan Wang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Xiang Wei
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Ni An
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Yixuan Li
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Wenjie Wang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Xiang Li
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Xu Fang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Junqi Sun
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
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Wu H, Wang H, Luo M, Yuan Z, Chen Y, Jin B, Wu W, Ye B, Zhang H, Wu J. Mechanically robust, self-reporting and healable polyurethane elastomers by incorporating symmetric/asymmetric chain extenders. MATERIALS HORIZONS 2024; 11:1548-1559. [PMID: 38263896 DOI: 10.1039/d3mh01987j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
Self-healing elastomers usually show poor mechanical properties and environmental stability, and they cannot self-report mechanical/chemical damage. Herein, an innovative design strategy is reported that combines symmetric/asymmetric chain extenders to create large yet disordered hard domains within polyurethane (PU) elastomers, enabling the integration of mechanical robustness and self-reporting and self-healing capabilities to overcome both mechanical and chemical damage. Specifically, large yet disordered hard domains were created by governing the molar contents of asymmetric fluorescent 2-(4-aminophenyl)-5-aminobenzimidazole (PABZ) and symmetric 4-aminophenyl disulfide (APDS). Such a structural feature led to a small free-volume fraction, prominent strain-induced crystallization (SIC), and high energy of dissipation, enabling the PU elastomer to display outstanding mechanical strength (60.7 MPa) and toughness (177.9 MJ m-3). Meanwhile, the loose stacking of disordered hard domains imposed small restriction on network chains and imparted the network with high relaxation dynamics, leading to high healing efficiency (97.8%). More importantly, the fluorescence intensity was stimulus-responsive and thus the PU elastomer could self-report mechanical/chemical damage and healing processes. The PU elastomer also showed potential application prospects in information encoding and encryption. Furthermore, selecting polydimethylsiloxane as one of the soft segments could effectively endow the PU elastomer with intrinsic hydrophobicity. Therefore, this work provides valuable guidance for designing multi-functional materials with anti-counterfeiting, self-reporting, and healing properties as well as high mechanical properties and hydrophobicity.
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Affiliation(s)
- Haitao Wu
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
| | - Hao Wang
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
| | - Mi Luo
- State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
| | - Zhaoyang Yuan
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
| | - Yiwen Chen
- State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
| | - Biqiang Jin
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
| | - Wenqiang Wu
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
| | - Bangjiao Ye
- State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
| | - Hongjun Zhang
- State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
| | - Jinrong Wu
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
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Liu X, Wu H, Xu W, Jiang Y, Zhang J, Ye B, Zhang H, Chen S, Miao M, Zhang D. Ultrastrong and High-Tough Thermoset Epoxy Resins from Hyperbranched Topological Structure and Subnanoscaled Free Volume. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2308434. [PMID: 37897665 DOI: 10.1002/adma.202308434] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 10/27/2023] [Indexed: 10/30/2023]
Abstract
The strength and toughness of thermoset epoxy resins are generally mutually exclusive, as are the high performance and rapid recyclability. Experimentally determined mechanical strength values are usually much lower than their theoretical values. The preparation of thermoset epoxy resins with high modulus, high toughness, ultrastrong strength, and highly efficient recyclability is still a challenge. Here, novel hyperbranched epoxy resins (Bn, n = 6, 12, 24) with imide structures by a thiol-ene click reaction. Bn shows an excellent comprehensive function in simultaneously improving the strength, modulus, toughness, low-temperature resistance, and degradability of diglycidyl ether of bisphenol-A (DGEBA). All the mechanical properties first increase and then decrease with minimization of the free volume properties. The improvement is attributable to uniform molecular holes or free volume by a molecular mixture of linear and hyperbranched topological structures. The precise measurement and controllability of the molecular free volume properties of epoxy resins is first discovered, as well as the imide structure degradation of crosslinked epoxy resins. The two conflicts are successfully resolved between strength and toughness and between high performance during service and high efficiency during degradation. These findings provide a route for designing ultrastrong, tough, and recyclable thermoset epoxy resins.
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Affiliation(s)
- Xin Liu
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, Hubei R&D Center of Hyperbranched Polymers Synthesis and Applications, South-Central Minzu University, Wuhan, 430074, China
| | - Huanghu Wu
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, Hubei R&D Center of Hyperbranched Polymers Synthesis and Applications, South-Central Minzu University, Wuhan, 430074, China
| | - Wei Xu
- State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, 230026, China
| | - Yu Jiang
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, Hubei R&D Center of Hyperbranched Polymers Synthesis and Applications, South-Central Minzu University, Wuhan, 430074, China
| | - Junheng Zhang
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, Hubei R&D Center of Hyperbranched Polymers Synthesis and Applications, South-Central Minzu University, Wuhan, 430074, China
| | - Bangjiao Ye
- State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, 230026, China
| | - Hongjun Zhang
- State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, 230026, China
| | - Sufang Chen
- Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan, 430205, China
| | - Menghe Miao
- Department of Mechanical Engineering, The University of Melbourne, Grattan Street, Parkville, VIC, 3010, Australia
| | - Daohong Zhang
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, Hubei R&D Center of Hyperbranched Polymers Synthesis and Applications, South-Central Minzu University, Wuhan, 430074, China
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5
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Liu J, Xiang Y, Chen Y, Zhang H, Ye B, Ren L, Tan W, Kappler A, Hou J. Quantitative Contribution of Oxygen Vacancy Defects to Arsenate Immobilization on Hematite. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:12453-12464. [PMID: 37561149 DOI: 10.1021/acs.est.3c03441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
Hematite is a common iron oxide in natural environments, which has been observed to influence the transport and fate of arsenate by its association with hematite. Although oxygen vacancies were demonstrated to exist in hematite, their contributions to the arsenate immobilization have not been quantified. In this study, hematite samples with tunable oxygen vacancy defect (OVD) concentrations were synthesized by treating defect-free hematite using different NaBH4 solutions. The vacancy defects were characterized by positron annihilation lifetime spectroscopy, Doppler broadening of annihilation radiation, extended X-ray absorption fine structure (EXAFS), thermogravimetric mass spectrometry (TG-MS), electron paramagnetic resonance (EPR), and X-ray photoelectron spectroscopy (XPS). The results revealed that oxygen vacancy was the primary defect type existing on the hematite surface. TG-MS combined with EPR analysis allowed quantification of OVD concentrations in hematite. Batch experiments revealed that OVDs had a positive effect on arsenate adsorption, which could be quantitatively described by a linear relationship between the OVD concentration (Cdef, mmol m-2) and the enhanced arsenate adsorption amount caused by defects (ΔQm, μmol m-2) (ΔQm = 20.94 Cdef, R2 = 0.9813). NH3-diffuse reflectance infrared Fourier transform (NH3-DRIFT) analysis and density functional theory (DFT) calculations demonstrated that OVDs in hematite were beneficial to the improvement in adsorption strength of surface-active sites, thus considerably promoting the immobilization of arsenate.
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Affiliation(s)
- Juan Liu
- State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Yongjin Xiang
- State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Yiwen Chen
- State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
| | - Hongjun Zhang
- State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
| | - Bangjiao Ye
- State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
| | - Lu Ren
- School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Wenfeng Tan
- State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Andreas Kappler
- Geomicrobiology, Department of Geosciences, University of Tuebingen, Tuebingen 72076, Germany
| | - Jingtao Hou
- State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
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6
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Consolati G, Nichetti D, Quasso F. Probing the Free Volume in Polymers by Means of Positron Annihilation Lifetime Spectroscopy. Polymers (Basel) 2023; 15:3128. [PMID: 37514518 PMCID: PMC10386335 DOI: 10.3390/polym15143128] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/18/2023] [Accepted: 07/20/2023] [Indexed: 07/30/2023] Open
Abstract
Positron annihilation lifetime spectroscopy (PALS) is a valuable technique to investigate defects in solids, such as vacancy clusters and grain boundaries in metals and alloys, as well as lattice imperfections in semiconductors. Positron spectroscopy is able to reveal the size, structure and concentration of vacancies with a sensitivity of 10-7. In the field of porous and amorphous systems, PALS can probe cavities in the range from a few tenths up to several tens of nm. In the case of polymers, PALS is one of the few techniques able to give information on the holes forming the free volume. This quantity, which cannot be measured with macroscopic techniques, is correlated to important mechanical, thermal, and transport properties of polymers. It can be deduced theoretically by applying suitable equations of state derived by cell models, and PALS supplies a quantitative measure of the free volume by probing the corresponding sub-nanometric holes. The system used is positronium (Ps), an unstable atom formed by a positron and an electron, whose lifetime can be related to the typical size of the holes. When analyzed in terms of continuous lifetimes, the positron annihilation spectrum allows one to gain insight into the distribution of the free volume holes, an almost unique feature of this technique. The present paper is an overview of PALS, addressed in particular to readers not familiar with this technique, with emphasis on the experimental aspects. After a general introduction on free volume, positronium, and the experimental apparatus needed to acquire the corresponding lifetime, some of the recent results obtained by various groups will be shown, highlighting the connections between the free volume as probed by PALS and structural properties of the investigated materials.
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Affiliation(s)
- Giovanni Consolati
- Department of Aerospace Science and Technology, Politecnico di Milano, Via LaMasa, 34, 20156 Milano, Italy
- INFN, Sezione di Milano, Via Celoria, 16, 20133 Milano, Italy
| | | | - Fiorenza Quasso
- Department of Aerospace Science and Technology, Politecnico di Milano, Via LaMasa, 34, 20156 Milano, Italy
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7
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Liu N, Cheng J, Liu L, Gao S, Hou W, Luo M, Zhang H, Ye B, Zhou J. Crosslinking two-dimensional metalloporphyrin (Me-TCPP) nanosheet with poly(ethylene) glycol semi-interpenetrating polymer network for ultrahigh CO2/N2 separation selectivity via “rubber-band” straightening effect. J Memb Sci 2023. [DOI: 10.1016/j.memsci.2023.121537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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8
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Li T, Zhang Y, Sun Y, Dai H, Chen J. Preparation and characterization of low-permittivity polyimide-based composite membrane. JOURNAL OF POLYMER RESEARCH 2023. [DOI: 10.1007/s10965-023-03508-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/14/2023]
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9
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Du S, Huang J, Ryder MR, Daemen LL, Yang C, Zhang H, Yin P, Lai Y, Xiao J, Dai S, Chen B. Probing sub-5 Ångstrom micropores in carbon for precise light olefin/paraffin separation. Nat Commun 2023; 14:1197. [PMID: 36864084 PMCID: PMC9981619 DOI: 10.1038/s41467-023-36890-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 02/17/2023] [Indexed: 03/04/2023] Open
Abstract
Olefin/paraffin separation is an important but challenging and energy-intensive process in petrochemical industry. The realization of carbons with size-exclusion capability is highly desirable but rarely reported. Herein, we report polydopamine-derived carbons (PDA-Cx, where x refers to the pyrolysis temperature) with tailorable sub-5 Å micropore orifices together with larger microvoids by one-step pyrolysis. The sub-5 Å micropore orifices centered at 4.1-4.3 Å in PDA-C800 and 3.7-4.0 Å in PDA-C900 allow the entry of olefins while entirely excluding their paraffin counterparts, performing a precise cut-off to discriminate olefin/paraffin with sub-angstrom discrepancy. The larger voids enable high C2H4 and C3H6 capacities of 2.25 and 1.98 mmol g-1 under ambient conditions, respectively. Breakthrough experiments confirm that a one-step adsorption-desorption process can obtain high-purity olefins. Inelastic neutron scattering further reveals the host-guest interaction of adsorbed C2H4 and C3H6 molecules in PDA-Cx. This study opens an avenue to exploit the sub-5 Å micropores in carbon and their desirable size-exclusion effect.
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Affiliation(s)
- Shengjun Du
- grid.79703.3a0000 0004 1764 3838School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, China
| | - Jiawu Huang
- grid.79703.3a0000 0004 1764 3838School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, China
| | - Matthew R. Ryder
- grid.135519.a0000 0004 0446 2659Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN USA
| | - Luke L. Daemen
- grid.135519.a0000 0004 0446 2659Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN USA
| | - Cuiting Yang
- grid.79703.3a0000 0004 1764 3838School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, China
| | - Hongjun Zhang
- grid.59053.3a0000000121679639State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, China
| | - Panchao Yin
- grid.79703.3a0000 0004 1764 3838State Key Laboratory of Luminescent Materials and Devices, School of Molecular Science and Engineering, South China University of Technology, Guangzhou, China
| | - Yuyan Lai
- grid.79703.3a0000 0004 1764 3838State Key Laboratory of Luminescent Materials and Devices, School of Molecular Science and Engineering, South China University of Technology, Guangzhou, China
| | - Jing Xiao
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, China.
| | - Sheng Dai
- Department of Chemistry, Institute for Advanced Materials and Manufacturing, University of Tennessee, Knoxville, TN, USA. .,Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
| | - Banglin Chen
- Fujian Provincial Key Laboratory of Polymer Materials, College of Chemistry & Materials Science, Fujian Normal University, Fuzhou, Fujian, China.
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10
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Jiao Y, Wu Q, Xu W, Lai W, Xiao L, Mei X, Zhang H, Luo S. Coordination enhancement of hydrogen and helium recovery in polybenzimidazole-based carbon molecular sieve membranes. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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11
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Jiao Y, Liu M, Wu Q, Zheng P, Xu W, Ye B, Zhang H, Guo R, Luo S. Finely tuning the microporosity in phosphoric acid doped triptycene-containing polybenzimidazole membranes for highly permselective helium and hydrogen recovery. J Memb Sci 2023. [DOI: 10.1016/j.memsci.2023.121474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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12
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Carbon nanotubes grown on ZIF-L(Zn@Co) surface improved CO2 permeability of mixed matrix membranes. J Memb Sci 2023. [DOI: 10.1016/j.memsci.2023.121356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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13
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Zhong X, Zhang L, Bao J, Li W, Liu H, Dong B. Preparation and compression mechanical properties of carbon fiber/epoxy nanoparticle composites. HIGH PERFORM POLYM 2022. [DOI: 10.1177/09540083221140755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In this work, the epoxy resin cured with chlorinated fluorene amine as the curing agent was obtained, which significantly increased the resin modulus and did not reduce the impact toughness, compared with the common curing system. Al2O3 nanoparticles were used to stiffen the new curing epoxy system, which did not reduce the compression strength of the resin but increased the compression modulus. The microscopic morphology showed that the rigid particles were uniformly dispersed in the resin matrix, and the addition of rigid particles mildly affected the reactional and rheological properties of the resin system. The minimum viscosity of the matrix increased with the additional number of particles. The composite was prepared using the nanoparticle-modified epoxy resin with carbon fiber (CF), and the compression strength of the composite was significantly improved by nearly 30% compared with that composed of the common epoxy system.
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Affiliation(s)
- Xiangyu Zhong
- AVIC MTI Composite Technology Center, AVIC Composite Corporation Ltd., National Key Laboratory of Advanced Composites, Beijing, China
| | - Lianwang Zhang
- AVIC MTI Composite Technology Center, AVIC Composite Corporation Ltd., National Key Laboratory of Advanced Composites, Beijing, China
| | - Jianwen Bao
- AVIC MTI Composite Technology Center, AVIC Composite Corporation Ltd., National Key Laboratory of Advanced Composites, Beijing, China
| | - Weidong Li
- AVIC MTI Composite Technology Center, AVIC Composite Corporation Ltd., National Key Laboratory of Advanced Composites, Beijing, China
| | - Hansong Liu
- AVIC MTI Composite Technology Center, AVIC Composite Corporation Ltd., National Key Laboratory of Advanced Composites, Beijing, China
| | - Botao Dong
- AVIC MTI Composite Technology Center, AVIC Composite Corporation Ltd., National Key Laboratory of Advanced Composites, Beijing, China
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14
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Liu L, Wang F, Zhu Y, Qi H. Degradable Schiff base benzoxazine thermosets with high glass transition temperature and its high‐performance epoxy alloy: Synthesis and properties. POLYM ADVAN TECHNOL 2022. [DOI: 10.1002/pat.5899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Lele Liu
- Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education School of Materials Science and Engineering, East China University of Science & Technology Shanghai China
| | - Fan Wang
- Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education School of Materials Science and Engineering, East China University of Science & Technology Shanghai China
| | - Yaping Zhu
- Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education School of Materials Science and Engineering, East China University of Science & Technology Shanghai China
| | - Huimin Qi
- Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education School of Materials Science and Engineering, East China University of Science & Technology Shanghai China
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15
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Wang C, Cai Z, Xie W, Jiao Y, Liu L, Gong L, Zhang QW, Ma X, Zhang H, Luo S. Finely tuning the microporosity in dual thermally crosslinked polyimide membranes for plasticization resistance gas separations. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.120769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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16
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Lian Q, Chen H, Luo Y, Li Y, Cheng J, Liu Y. Toughening mechanism based on the physical entanglement of branched epoxy resin in the non-phase-separated inhomogeneous crosslinking network: An experimental and molecular dynamics simulation study. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124754] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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17
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Mg2(dobdc) crystals adhere to Matrimid matrix membranes bridged by diethylenetriamine (DETA) as an adhesion agent for efficient CO2 separation. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119635] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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18
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Sun Y, Li T, Dai H, Wang M, Xue R, Chen J, Liu D. Preparation and Characterization of Intrinsic Low-κ Polyimide Films. Polymers (Basel) 2021; 13:polym13234174. [PMID: 34883677 PMCID: PMC8659940 DOI: 10.3390/polym13234174] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 11/19/2021] [Accepted: 11/26/2021] [Indexed: 11/16/2022] Open
Abstract
Three fluorinated polyimide (PI-FP, PI-FO and PI-FH) films with low dielectric constants and excellent comprehensive properties were successfully prepared using a polycondensation reaction method by incorporating p-phenylenediamine (PDA), 4-4′-diaminodiphenyl ether (ODA) and 4,4′-(Hexafluoroisopropylidene) bis (p-phenyleneoxy) dianiline (HFPBDA) into 4,4′-(Hexafluoroisopropylidene) diphthalic anhydride (6FDA), respectively. The effects of the diamine monomer structure on optical, dielectric and mechanical properties were investigated. Compared with PDA and ODA, HFPBDA can effectively improve the optical and dielectric properties of PI due to due to its special chain structure. Among the three PI films, PI-FH film presents the best optic transmission (highest transmittance = 90.2%) and highest energy gap (2.69 eV). The dielectric properties of PI-FH film improve the most. The dielectric constant and loss at 104 Hz are reduced to 2.05 and 0.0034 at 104 Hz, respectively, and remain stable up to 250 °C. The mechanical properties decrease in turn for PI-FP, PI-FO and PI-FH films due to the increase in free volume fraction. Nevertheless, PI-FH film still exhibits good mechanical properties with a tensile strength of 88.4 Mpa, a tensile modulus of 2.11 GPa and an elongation at break of 4.1%. The correlation between the dielectric and mechanical properties of PI films and their free volume characteristics is well explained with the help of positron annihilation spectroscopy.
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19
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Bipolar membrane electrodialysis for clean production of
L
‐10‐camphorsulfonic
acid: From laboratory to industrialization. AIChE J 2021. [DOI: 10.1002/aic.17490] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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20
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Consolati G, Mossini E, Nichetti D, Quasso F, Viola GM, Yaynik E. Shape and Temperature Expansion of Free Volume Holes in Some Cured Polybutadiene-Polyisoprene Rubber Blends. Int J Mol Sci 2021; 22:ijms22031436. [PMID: 33535426 PMCID: PMC7867040 DOI: 10.3390/ijms22031436] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 01/28/2021] [Accepted: 01/28/2021] [Indexed: 01/03/2023] Open
Abstract
The free volume fraction of a macromolecular structure can be assessed theoretically by using a suitable model; however, it can also be evaluated from experimental data obtained from dilatometry and positron annihilation lifetime spectra. In this second case, a regular geometry of the sub-nanometric cavities forming the free volume has to be assumed, although in fact they are irregularly shaped. The most popular approach is to guess spherical holes, which implies an isotropic growth of these last with temperature. In this work, we compared the free volume fraction, as obtained from experiments in a set of polybutadiene and polyisoprene cured rubbers and their blends, with the analogous quantity expected by using the lattice-hole model. The results allowed us to obtain insights on the approximate shape of the holes. Indeed, a cylindrical flattened geometry of the cavities produced a better agreement with the theory than the spherical shape. Furthermore, the best fit was obtained for holes that expanded preferentially in the radial direction, with a consequent decrease of the aspect ratio with temperature.
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Affiliation(s)
- Giovanni Consolati
- Department of Aerospace Science and Technology, Politecnico di Milano, Via LaMasa, 34, 20156 Milano, Italy; (F.Q.); (G.M.V.); (E.Y.)
- INFN, Sezione di Milano, Via Celoria, 16, 20133 Milano, Italy
- Correspondence:
| | - Eros Mossini
- Department of Energy, Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy;
| | | | - Fiorenza Quasso
- Department of Aerospace Science and Technology, Politecnico di Milano, Via LaMasa, 34, 20156 Milano, Italy; (F.Q.); (G.M.V.); (E.Y.)
| | - Giuseppe Maria Viola
- Department of Aerospace Science and Technology, Politecnico di Milano, Via LaMasa, 34, 20156 Milano, Italy; (F.Q.); (G.M.V.); (E.Y.)
| | - Erkin Yaynik
- Department of Aerospace Science and Technology, Politecnico di Milano, Via LaMasa, 34, 20156 Milano, Italy; (F.Q.); (G.M.V.); (E.Y.)
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21
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Chen H, Lian Q, Xu W, Hou X, Li Y, Wang Z, An D, Liu Y. Insights into the synergistic mechanism of reactive aliphatic soft chains and nano‐silica on toughening epoxy resins with improved mechanical properties and low viscosity. J Appl Polym Sci 2021. [DOI: 10.1002/app.50484] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Hongfeng Chen
- College of Materials Science and Engineering, Key Laboratory of Functional Nanocomposites of Shanxi Province North University of China Taiyuan China
| | - Qingsong Lian
- College of Materials Science and Engineering, Key Laboratory of Functional Nanocomposites of Shanxi Province North University of China Taiyuan China
- The Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials Beijing University of Chemical Technology Beijing China
| | - Weijie Xu
- College of Materials Science and Engineering, Key Laboratory of Functional Nanocomposites of Shanxi Province North University of China Taiyuan China
| | - Xuqi Hou
- The Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials Beijing University of Chemical Technology Beijing China
| | - Yan Li
- Department of Materials Application Research AVIC Manufacturing Technology Institute Beijing China
| | - Zhi Wang
- College of Materials Science and Engineering, Key Laboratory of Functional Nanocomposites of Shanxi Province North University of China Taiyuan China
| | - Dong An
- College of Materials Science and Engineering, Key Laboratory of Functional Nanocomposites of Shanxi Province North University of China Taiyuan China
| | - Yaqing Liu
- College of Materials Science and Engineering, Key Laboratory of Functional Nanocomposites of Shanxi Province North University of China Taiyuan China
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22
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Lanno GM, Ramos C, Preem L, Putrinš M, Laidmäe I, Tenson T, Kogermann K. Antibacterial Porous Electrospun Fibers as Skin Scaffolds for Wound Healing Applications. ACS OMEGA 2020; 5:30011-30022. [PMID: 33251437 PMCID: PMC7689890 DOI: 10.1021/acsomega.0c04402] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 11/03/2020] [Indexed: 05/14/2023]
Abstract
Electrospun fiber scaffolds have a huge potential for the successful treatment of infected wounds based on their unique properties. Although several studies report novel drug-loaded electrospun fiber-based biomaterials, many of these do not provide information on their interactions with eukaryotic and bacterial cells. The main aim of this study was to develop antibacterial drug-loaded porous biocompatible polycaprolactone (PCL) fiber scaffolds mimicking the native extracellular matrix for wound healing purposes. Mechanical property evaluation and different biorelevant tests were conducted in order to understand the structure-activity relationships and reveal how the surface porosity of fibers and the fiber diameter affect the scaffold interactions with the living bacterial and eukaryotic fibroblast cells. Cell migration and proliferation assays and antibiofilm assays enabled us to enlighten the biocompatibility and safety of fiber scaffolds and their suitability to be used as scaffolds for the treatment of infected wounds. Here, we report that porous PCL microfiber scaffolds obtained using electrospinning at high relative humidity served as the best surfaces for fibroblast attachment and growth compared to the nonporous microfiber or nonporous nanofiber PCL scaffolds. Porous chloramphenicol-loaded microfiber scaffolds were more elastic compared to nonporous scaffolds and had the highest antibiofilm activity. The results indicate that in addition to the fiber diameter and fiber scaffold porosity, the single-fiber surface porosity and its effect on drug release, mechanical properties, cell viability, and antibiofilm activity need to be understood when developing antibacterial biocompatible scaffolds for wound healing applications. We show that pores on single fibers within an electrospun scaffold, in addition to nano- and microscale diameter of the fibers, change the living cell-fiber interactions affecting the antibiofilm efficacy and biocompatibility of the scaffolds for the local treatment of wounds.
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Affiliation(s)
- Georg-Marten Lanno
- Institute
of Technology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia
| | - Celia Ramos
- Institute
of Pharmacy, University of Tartu, Nooruse 1, 50411 Tartu, Estonia
| | - Liis Preem
- Institute
of Pharmacy, University of Tartu, Nooruse 1, 50411 Tartu, Estonia
| | - Marta Putrinš
- Institute
of Technology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia
| | - Ivo Laidmäe
- Institute
of Pharmacy, University of Tartu, Nooruse 1, 50411 Tartu, Estonia
- Department
of Immunology, Institute of Biomedicine and Translational Medicine, University of Tartu, Ravila 19, 50411 Tartu, Estonia
| | - Tanel Tenson
- Institute
of Technology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia
| | - Karin Kogermann
- Institute
of Pharmacy, University of Tartu, Nooruse 1, 50411 Tartu, Estonia
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23
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Effect of crosslinking rate on the glass transition temperature of polyimide cross-linked silica aerogels. JOURNAL OF POLYMER RESEARCH 2020. [DOI: 10.1007/s10965-020-02082-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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24
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Soykan U, Ozturk Sen B, Cetin S, Yahsi U, Tav C. A detailed survey for determination of the grafted semifluorinated acrylic compound effect on thermal, microstructural, free volume, mechanical and morphological features of HDPE. J Fluor Chem 2020. [DOI: 10.1016/j.jfluchem.2020.109511] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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25
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Antiplasticization of Polymer Materials: Structural Aspects and Effects on Mechanical and Diffusion-Controlled Properties. Polymers (Basel) 2020; 12:polym12040769. [PMID: 32244603 PMCID: PMC7240542 DOI: 10.3390/polym12040769] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 03/17/2020] [Accepted: 03/26/2020] [Indexed: 11/17/2022] Open
Abstract
Antiplasticization of glassy polymers, arising from the addition of small amounts of plasticizer, was examined to highlight the developments that have taken place over the last few decades, aiming to fill gaps of knowledge in the large number of disjointed publications. The analysis includes the role of polymer/plasticizer molecular interactions and the conditions leading to the cross-over from antiplasticization to plasticization. This was based on molecular dynamics considerations of thermal transitions and related relaxation spectra, alongside the deviation of free volumes from the additivity rule. Useful insights were gained from an analysis of data on molecular glasses, including the implications of the glass fragility concept. The effects of molecular packing resulting from antiplasticization are also discussed in the context of physical ageing. These include considerations on the effects on mechanical properties and diffusion-controlled behaviour. Some peculiar features of antiplasticization regarding changes in Tg were probed and the effects of water were examined, both as a single component and in combination with other plasticizers to illustrate the role of intermolecular forces. The analysis has also brought to light the shortcomings of existing theories for disregarding the dual cross-over from antiplasticization to plasticization with respect to modulus variation with temperature and for not addressing failure related properties, such as yielding, crazing and fracture toughness.
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26
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Effect of free-volume holes on static mechanical properties of epoxy resins studied by positron annihilation and PVT experiments. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122225] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Zhang HJ, Sellaiyan S, Sako K, Uedono A, Taniguchi Y, Hayashi K. Effect of Free-Volume Hole Fraction on Dynamic Mechanical Properties of Epoxy Resins Investigated by Pressure–Volume–Temperature Technique. J Phys Chem B 2020; 124:1824-1832. [DOI: 10.1021/acs.jpcb.9b10978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- H. J. Zhang
- Division of Applied Physics, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
| | - S. Sellaiyan
- Division of Applied Physics, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
| | - K. Sako
- Division of Applied Physics, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
| | - A. Uedono
- Division of Applied Physics, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
| | - Y. Taniguchi
- NIPPON STEEL Chemical & Material Co., Ltd., Kitasode 11-5, Sodegaura, Chiba 299-0266, Japan
| | - K. Hayashi
- NIPPON STEEL Chemical & Material Co., Ltd., Kitasode 11-5, Sodegaura, Chiba 299-0266, Japan
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28
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Biganeh A, Kakuee O, Rafi-Kheiri H, Lamehi-Rachti M, Sheikh N, Yahaghi E. Positron Annihilation Lifetime and Doppler Broadening Spectroscopy of polymers. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2019.108461] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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29
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Catalysis mechanism of Pd(II)@PVA membrane catalyst studied from the aspect of molecular level micro-defects by positron annihilation spectroscopy. Radiat Phys Chem Oxf Engl 1993 2019. [DOI: 10.1016/j.radphyschem.2018.10.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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30
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Chen X, Huang L, Dong C, Niu L, Zhang Y, Chen Z. Influenceof Vinyl Acetate Content on the Surface Hydrophobic Recovery of Ethylene Vinyl Acetate Copolymer after Plasma Modification. ChemistrySelect 2019. [DOI: 10.1002/slct.201803826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Xingxing Chen
- School of Urban ConstructionYangtze University Jingzhou 434023 China
| | - Long Huang
- Key Laboratory of Qinghai Salt Lake Resources Comprehensive UtilizationQinghai Salt Lake Industry Co. Ltd Golmud 816000 China
| | - Changji Dong
- Key Laboratory of Qinghai Salt Lake Resources Comprehensive UtilizationQinghai Salt Lake Industry Co. Ltd Golmud 816000 China
| | - Lihui Niu
- Key Laboratory of Qinghai Salt Lake Resources Comprehensive UtilizationQinghai Salt Lake Industry Co. Ltd Golmud 816000 China
| | - Yong Zhang
- School of Materials Science and EngineeringWuhan Institute of Technology Wuhan 430205 China
| | - Zhe Chen
- School of Materials Science and EngineeringWuhan Institute of Technology Wuhan 430205 China
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31
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Zhang J, Chen S, Qin B, Zhang D, Guo P, He Q. Preparation of hyperbranched polymeric ionic liquids for epoxy resin with simultaneous improvement of strength and toughness. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.01.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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32
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Shen D, Yuan L, Liang G, Gu A, Guan Q. Thermally resistant photocrosslinked damping poly(phenylene oxide)-fluorosilicone rubber films with broad and high effective damping temperatures. J Appl Polym Sci 2018. [DOI: 10.1002/app.47231] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Da Shen
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren'Ai Road, Suzhou 215123 China
| | - Li Yuan
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren'Ai Road, Suzhou 215123 China
| | - Guozheng Liang
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren'Ai Road, Suzhou 215123 China
| | - Aijuan Gu
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren'Ai Road, Suzhou 215123 China
| | - Qingbao Guan
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren'Ai Road, Suzhou 215123 China
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33
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Linde E, Giron NH, Celina MC. Water diffusion with temperature enabling predictions for sorption and transport behavior in thermoset materials. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.08.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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34
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35
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Kim C, Cho CH, Son I, Lee H, Han JW, Kim JG, Lee JH. Effect of microscale oil penetration on mechanical and chemical properties of carbon fiber-reinforced epoxy composites. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2017.12.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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36
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Supported Ionic Liquid Silica as Curing Agent for Epoxy Composites with Improved Mechanical and Thermal Properties. Polymers (Basel) 2017; 9:polym9100478. [PMID: 30965780 PMCID: PMC6418587 DOI: 10.3390/polym9100478] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 09/28/2017] [Accepted: 09/28/2017] [Indexed: 11/17/2022] Open
Abstract
The present study aims to improve the mechanical properties of epoxy composite by incorporating supported ionic liquid silica (IL-silica). The IL-silica not only showed improved interfacial interaction and reinforcement, but also served as cure agent of epoxy composites. The differential scanning calorimetry analysis revealed that epoxy composites could be successfully cured with IL-silica without any routine curing agents. IL-silica/epoxy composites presented higher mechanical and thermal properties compared with epoxy composite containing un-functionalized silica (u-silica). The dynamic mechanical analysis showed that the storage modulus of composites significantly increased with the addition of IL-silica in comparison to that with added u-silica, as well as the variation of Tg parameter. The incorporation of IL-silica simultaneously enhanced the tensile strength, toughness, and thermal stability of the epoxy composites. The considerable improvements in mechanical and thermal properties are ascribed to the improved dispersion of IL-silica and the enhanced interfacial interactions between epoxy matrix and IL-silica by strong covalent bonding, which results in an effective load transfer.
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