1
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Yang J, Song X, Chen D, Liu Y, Wang Y, Shi J. The improvement of flame retardancy and compatibility of PBAT/PLLA via a hybrid polyurethane. Int J Biol Macromol 2024; 273:133057. [PMID: 38866295 DOI: 10.1016/j.ijbiomac.2024.133057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2024] [Revised: 05/31/2024] [Accepted: 06/07/2024] [Indexed: 06/14/2024]
Abstract
Poly (butylene adipate-co-terephthalate)/poly (L-lactic acid) (PBAT/PLLA) is one of the most important biodegradable polymer combinations; however, they are flammable with heavy melt dripping and incompatible. To achieve the objective of flame retardation and compatibility, a hybrid polyurethane (PU) with multiple flame retardation elements is synthesized via a new ring-opening polymerization (ROP) method and integrated into PBAT/PLLA film. The PU not only dissolves in different organic solvents at mild temperature but also improves the compatibility of PBAT/PLLA. As PU with respect to PBAT/PLLA is 20 wt%, the limiting oxygen index (LOI) and UL-94 reach 25.5 % and V-0 rating, respectively. In cone calorimeter test, the peak heat release rate (pHRR) of PU/PBAT/PLLA is ahead of PBAT/PLLA, and the total heat release (THR) decreases to 25.85 MJ/m2. The fire safety is achieved successfully. The initial pyrolysis of PU promotes the formation of a seed carbon layer; it continuously breaks down into a series of phosphorus‑oxygen radicals and generates different inert gases, while the pyrolytic solid products accelerate the carbonization to form the carbon/silicon composite layer. Then the polymeric combustion is braked completely. Besides, the PU can also tune the mechanical properties of PBAT/PLLA film and enhance its hydrophobicity. This work opens a new window for developing multifunctional flame retardant and paves the way for the richening engineering application of PBAT/PLLA.
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Affiliation(s)
- Jie Yang
- School of Chemical Engineering, Changchun University of Technology, China
| | - Xiaofeng Song
- School of Chemical Engineering, Changchun University of Technology, China; Jiangxi Center of Modern Apparel Engineering and Technology, Jiangxi Institute of Fashion Technology, China.
| | - Dongsheng Chen
- Jiangxi Center of Modern Apparel Engineering and Technology, Jiangxi Institute of Fashion Technology, China
| | - Yihan Liu
- School of Chemical Engineering, Changchun University of Technology, China
| | - Yanhe Wang
- Jiangxi Center of Modern Apparel Engineering and Technology, Jiangxi Institute of Fashion Technology, China
| | - Jianguo Shi
- School of Chemical Engineering, Changchun University of Technology, China
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2
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Chen Y, Song X, Wang Y, Huang Y, Wang Y, Zhu C. The effect of Pluronic P123 on shape memory of cross-linked polyurethane/poly(l-lactide) biocomposite. Int J Biol Macromol 2024; 259:128788. [PMID: 38154706 DOI: 10.1016/j.ijbiomac.2023.128788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 12/02/2023] [Accepted: 12/12/2023] [Indexed: 12/30/2023]
Abstract
Polyurethane (PU) and poly(l-lactide) (PLLA) have attracted increasing attention in the development of shape memory polymers (SMPs) due to their good biocompatibility and degradability. Although Pluronic P123 can be used to tune polymeric surface hydrophilicity, its effect on SM performance is a mystery. In this study, a soluble cross-linked PU is synthesized as the switching phase and combined with PLLA and P123 to construct a hydrothermally responsive SM composite. The water contact angle of PU/PLLA/P123 decreases from 22.7° to 5.1° within 2 min. PU and P123 form the switching group, which enhances the SM behavior of the composite. The shape fixity (Rf) and shape recovery (Rr) of PU/PLLA/P123 are 94.4 % and 98 % in 55 °C water, respectively, and the shape recovery time is only 10 s. P123 plays the role of "turbine" in the SM process. PU/PLLA/P123 exhibits a balance between stiffness and elasticity, and good degradability. Furthermore, PU/PLLA/P123 is also biocompatible and beneficial to cell proliferation and growth. Therefore, it offers an alternative approach to developing hydrothermally responsive SM biocomposites based on P123, PU and PLLA for biomedical applications.
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Affiliation(s)
- Youhua Chen
- School of Chemical Engineering, Changchun University of Technology, China
| | - Xiaofeng Song
- School of Chemical Engineering, Changchun University of Technology, China; Jiangxi Center of Modern Apparel Engineering and Technology, Jiangxi Institute of Fashion Technology, China.
| | - Ying Wang
- School of Chemical Engineering, Changchun University of Technology, China
| | - Yuan Huang
- School of Chemical Engineering, Changchun University of Technology, China
| | - Yanhe Wang
- Jiangxi Center of Modern Apparel Engineering and Technology, Jiangxi Institute of Fashion Technology, China
| | - Chuanming Zhu
- School of Chemical Engineering, Changchun University of Technology, China
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3
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Staszczak M, Urbański L, Cristea M, Ionita D, Pieczyska EA. Investigation of Shape Memory Polyurethane Properties in Cold Programming Process Towards Its Applications. Polymers (Basel) 2024; 16:219. [PMID: 38257020 PMCID: PMC10819366 DOI: 10.3390/polym16020219] [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: 11/30/2023] [Revised: 01/05/2024] [Accepted: 01/10/2024] [Indexed: 01/24/2024] Open
Abstract
Thermoresponsive shape memory polymers (SMPs) with the remarkable ability to remember a temporary shape and recover their original one using temperature have been gaining more and more attention in a wide range of applications. Traditionally, SMPs are investigated using a method named often "hot-programming", since they are heated above their glass transition temperature (Tg) and after that, reshaped and cooled below Tg to achieve and fix the desired configuration. Upon reheating, these materials return to their original shape. However, the heating of SMPs above their Tg during a thermomechanical cycle to trigger a change in their shape creates a temperature gradient within the material structure and causes significant thermal expansion of the polymer sample resulting in a reduction in its shape recovery property. These phenomena, in turn, limit the application fields of SMPs, in which fast actuation, dimensional stability and low thermal expansion coefficient are crucial. This paper aims at a comprehensive experimental investigation of thermoplastic polyurethane shape memory polymer (PU-SMP) using the cold programming approach, in which the deformation of the SMP into the programmed shape is conducted at temperatures below Tg. The PU-SMP glass transition temperature equals approximately 65 °C. Structural, mechanical and thermomechanical characterization was performed, and the results on the identification of functional properties of PU-SMPs in quite a large strain range beyond yield limit were obtained. The average shape fixity ratio of the PU-SMP at room temperature programming was found to be approximately 90%, while the average shape fixity ratio at 45 °C (Tg - 20 °C) was approximately 97%. Whereas, the average shape recovery ratio was 93% at room temperature programming and it was equal to approximately 90% at 45 °C. However, the results obtained using the traditional method, the so-called hot programming at 65 °C, indicate a higher shape fixity value of 98%, but a lower shape recovery of 90%. Thus, the obtained results confirmed good shape memory properties of the PU-SMPs at a large strain range at various temperatures. Furthermore, the experiments conducted at both temperatures below Tg demonstrated that cold programming can be successfully applied to PU-SMPs with a relatively high Tg. Knowledge of the PU-SMP shape memory and shape fixity properties, estimated without risk of material degradation, caused by heating above Tg, makes them attractive for various applications, e.g., in electronic components, aircraft or aerospace structures.
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Affiliation(s)
- Maria Staszczak
- Institute of Fundamental Technological Research, Polish Academy of Sciences, 02-106 Warsaw, Poland; (M.S.); (L.U.)
| | - Leszek Urbański
- Institute of Fundamental Technological Research, Polish Academy of Sciences, 02-106 Warsaw, Poland; (M.S.); (L.U.)
| | - Mariana Cristea
- “Petru Poni” Institute of Macromolecular Chemistry, 700487 Iasi, Romania; (M.C.); (D.I.)
| | - Daniela Ionita
- “Petru Poni” Institute of Macromolecular Chemistry, 700487 Iasi, Romania; (M.C.); (D.I.)
| | - Elżbieta Alicja Pieczyska
- Institute of Fundamental Technological Research, Polish Academy of Sciences, 02-106 Warsaw, Poland; (M.S.); (L.U.)
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4
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Ibebunjo K, Tella S, Kiljunen S, Repo E. Shape Memory Respirator Mask for Airborne Viruses. Polymers (Basel) 2023; 15:polym15081859. [PMID: 37112005 PMCID: PMC10145067 DOI: 10.3390/polym15081859] [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: 02/13/2023] [Revised: 03/25/2023] [Accepted: 04/04/2023] [Indexed: 04/29/2023] Open
Abstract
The emergence of COVID-19 has spurred demand for facemasks and prompted many studies aiming to develop masks that provide maximum protection. Filtration capacity and fit define the level of protection a mask can provide, and the fit is in large part determined by face shape and size. Due to differences in face dimensions and shapes, a mask of one size will not be likely to fit all faces. In this work, we examined shape memory polymers (SMPs) for producing facemasks that are able to alter their shape and size to fit every face. Polymer blends with and without additives or compatibilizers were melt-extruded, and their morphology, melting and crystallization behavior, mechanical properties, and shape memory (SM) behavior were characterized. All the blends had phase-separated morphology. The mechanical properties of the SMPs were modified by altering the content of polymers and compatibilizers or additives in the blends. The reversible and fixing phases are determined by the melting transitions. SM behavior is caused by physical interaction at the interface between the two phases in the blend and the crystallization of the reversible phase. The optimal SM blend and printing material for the mask was determined to be a polylactic acid (PLA)/polycaprolactone (PCL) blend with 30% PCL. A 3D-printed respirator mask was manufactured and fitted to several faces after being thermally activated at 65°C. The mask had excellent SM and could be molded and remolded to fit a variety of facial shapes and sizes. The mask also exhibited self-healing and healed from surface scratches.
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Affiliation(s)
- Kosisochi Ibebunjo
- Department of Separation Science, School of Engineering Science, LUT University, FI-53850 Lappeenranta, Finland
| | - Susanna Tella
- Faculty of Health Care and Social Services, LAB University of Applied Sciences, FI-53850 Lappeenranta, Finland
| | - Samantha Kiljunen
- Department of Separation Science, School of Engineering Science, LUT University, FI-53850 Lappeenranta, Finland
| | - Eveliina Repo
- Department of Separation Science, School of Engineering Science, LUT University, FI-53850 Lappeenranta, Finland
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5
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Wu F, Hu J, Yang S, Li G, Chen H, Fang H. High‐efficiency shape memory copolymers of
polycaprolactone
/
thermoplastic polyurethane
fabricated via in situ ring‐opening polymerization. POLYM ENG SCI 2023. [DOI: 10.1002/pen.26272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Affiliation(s)
- Fangjuan Wu
- College of Materials Science and Engineering Fujian University of Technology Fuzhou China
- Key Laboratory of Polymer Materials and Products of Universities in Fujian Fujian University of Technology Fuzhou China
| | - Jiahuan Hu
- College of Materials Science and Engineering Fujian University of Technology Fuzhou China
| | - Shangda Yang
- College of Materials Science and Engineering Fujian University of Technology Fuzhou China
| | - Guifeng Li
- College of Materials Science and Engineering Fujian University of Technology Fuzhou China
| | - Haoxiang Chen
- College of Materials Science and Engineering Fujian University of Technology Fuzhou China
| | - Hui Fang
- College of Materials Science and Engineering Fujian University of Technology Fuzhou China
- Key Laboratory of Polymer Materials and Products of Universities in Fujian Fujian University of Technology Fuzhou China
- Fujian Provincial Key Laboratory of Advanced Materials Processing and Application Fujian University of Technology Fuzhou China
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6
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Rahmatabadi D, Aberoumand M, Soltanmohammadi K, Soleyman E, Ghasemi I, Baniassadi M, Abrinia K, Zolfagharian A, Bodaghi M, Baghani M. A New Strategy for Achieving Shape Memory Effects in 4D Printed Two-Layer Composite Structures. Polymers (Basel) 2022; 14:polym14245446. [PMID: 36559813 PMCID: PMC9787995 DOI: 10.3390/polym14245446] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 12/07/2022] [Accepted: 12/09/2022] [Indexed: 12/15/2022] Open
Abstract
In this study, a new strategy and design for achieving a shape memory effect (SME) and 4D printed two-layer composite structures is unveiled, thanks to fused deposition modeling (FDM) biomaterial printing of commercial filaments, which do not have an SME. We used ABS and PCL as two well-known thermoplastics, and TPU as elastomer filaments that were printed in a two-layer structure. The thermoplastic layer plays the role of constraint for the elastomeric layer. A rubber-to-glass transition of the thermoplastic layer acts as a switching phenomenon that provides the capability of stabilizing the temporary shape, as well as storing the deformation stress for the subsequent recovery of the permanent shape by phase changing the thermoplastic layer in the opposite direction. The results show that ABS-TPU had fixity and recovery ratios above 90%. The PCL-TPU composite structure also demonstrated complete recovery, but its fixity was 77.42%. The difference in the SME of the two composite structures is related to the transition for each thermoplastic and programming temperature. Additionally, in the early cycles, the shape-memory performance decreased, and in the fourth and fifth cycles, it almost stabilized. The scanning electron microscopy (SEM) photographs illustrated superior interfacial bonding and part integrity in the case of multi-material 3D printing.
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Affiliation(s)
- Davood Rahmatabadi
- School of Mechanical Engineering, University of Tehran, Tehran 14174, Iran
| | | | | | - Elyas Soleyman
- School of Mechanical Engineering, University of Tehran, Tehran 14174, Iran
| | - Ismaeil Ghasemi
- Faculty of Processing, Iran Polymer and Petrochemical Institute, Tehran 14975, Iran
| | - Majid Baniassadi
- School of Mechanical Engineering, University of Tehran, Tehran 14174, Iran
| | - Karen Abrinia
- School of Mechanical Engineering, University of Tehran, Tehran 14174, Iran
| | - Ali Zolfagharian
- School of Engineering, Deakin University, Geelong 3216, Australia
| | - Mahdi Bodaghi
- Department of Engineering, School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, UK
- Correspondence: (M.B.); (M.B.)
| | - Mostafa Baghani
- School of Mechanical Engineering, University of Tehran, Tehran 14174, Iran
- Correspondence: (M.B.); (M.B.)
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7
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Aiswarya S, Awasthi P, Banerjee SS. Self-healing thermoplastic elastomeric materials: Challenges, opportunities and new approaches. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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8
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Dual stimulus response mechanical properties tunable biodegradable and biocompatible PLCL/PPDO based shape memory composites. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Wen J, Chen T, Wang J, Tuo X, Gong Y, Guo J. Study on the healing performance of poly(
ε
‐caprolactone) filled ultraviolet‐curable
3D
printed cyclic trimethylolpropane formal acrylate shape memory polymers. J Appl Polym Sci 2022. [DOI: 10.1002/app.53085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jia Wen
- Dalian Polytechnic University Dalian People's Republic of China
| | - Tingjun Chen
- Dalian Polytechnic University Dalian People's Republic of China
| | - Jiayao Wang
- Dalian Polytechnic University Dalian People's Republic of China
| | - Xiaohang Tuo
- Dalian Polytechnic University Dalian People's Republic of China
| | - Yumei Gong
- Dalian Polytechnic University Dalian People's Republic of China
| | - Jing Guo
- Dalian Polytechnic University Dalian People's Republic of China
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10
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Tzoumani I, Soto Beobide A, Iatridi Z, Voyiatzis GA, Bokias G, Kallitsis JK. Glycidyl Methacrylate-Based Copolymers as Healing Agents of Waterborne Polyurethanes. Int J Mol Sci 2022; 23:ijms23158118. [PMID: 35897694 PMCID: PMC9332020 DOI: 10.3390/ijms23158118] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 07/15/2022] [Accepted: 07/21/2022] [Indexed: 11/22/2022] Open
Abstract
Self-healing materials and self-healing mechanisms are two topics that have attracted huge scientific interest in recent decades. Macromolecular chemistry can provide appropriately tailored functional polymers with desired healing properties. Herein, we report the incorporation of glycidyl methacrylate-based (GMA) copolymers in waterborne polyurethanes (WPUs) and the study of their potential healing ability. Two types of copolymers were synthesized, namely the hydrophobic P(BA-co-GMAy) copolymers of GMA with n-butyl acrylate (BA) and the amphiphilic copolymers P(PEGMA-co-GMAy) of GMA with a poly(ethylene glycol) methyl ether methacrylate (PEGMA) macromonomer. We demonstrate that the blending of these types of copolymers with two WPUs leads to homogenous composites. While the addition of P(BA-co-GMAy) in the WPUs leads to amorphous materials, the addition of P(PEGMA-co-GMAy) copolymers leads to hybrid composite systems varying from amorphous to semi-crystalline, depending on copolymer or blend composition. The healing efficiency of these copolymers was explored upon application of two external triggers (addition of water or heating). Promising healing results were exhibited by the final composites when water was used as a healing trigger.
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Affiliation(s)
- Ioanna Tzoumani
- Department of Chemistry, University of Patras, GR-26504 Patras, Greece; (I.T.); (A.S.B.); (G.B.); (J.K.K.)
| | - Amaia Soto Beobide
- Department of Chemistry, University of Patras, GR-26504 Patras, Greece; (I.T.); (A.S.B.); (G.B.); (J.K.K.)
- FORTH/ICE-HT, Stadiou Street, P.O. Box 1414, GR-26504 Patras, Greece;
| | - Zacharoula Iatridi
- Department of Chemistry, University of Patras, GR-26504 Patras, Greece; (I.T.); (A.S.B.); (G.B.); (J.K.K.)
- Correspondence:
| | | | - Georgios Bokias
- Department of Chemistry, University of Patras, GR-26504 Patras, Greece; (I.T.); (A.S.B.); (G.B.); (J.K.K.)
| | - Joannis K. Kallitsis
- Department of Chemistry, University of Patras, GR-26504 Patras, Greece; (I.T.); (A.S.B.); (G.B.); (J.K.K.)
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11
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Huang J, Gong Z, Chen Y. A stretchable elastomer with recyclability and shape memory assisted self-healing capabilities based on dynamic disulfide bonds. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124569] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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12
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Li C, Wang P, Zhang D. Multifunctional and robust composite coating with water repellency and self-healing against marine corrosion. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.03.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Xue X, Liang K, Wang X, Huang W, Yang H, Jiang L, Jiang Q, Jiang B, Komarneni S. Preparation and characterization of thermal‐ and light‐triggered self‐healing azobenzene polymer. POLYM ADVAN TECHNOL 2022. [DOI: 10.1002/pat.5606] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Xiaoqiang Xue
- Jiangsu Key Laboratory of Material Surface Technology, School of Material Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Changzhou China
- Industrial College of Carbon Fiber and New Materials, School of Chemical Engineering and Materials Changzhou Institute of Technology Changzhou China
- Materials Research Institute and Department of Ecosystem Science and Management, 204 Energy and the Environment Laboratory The Pennsylvania State University University Park Pennsylvania USA
- Changzhou University Huaide College Jingjiang China
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Soochow University Suzhou China
| | - Kang Liang
- Jiangsu Key Laboratory of Material Surface Technology, School of Material Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Changzhou China
| | - Xuezi Wang
- Jiangsu Key Laboratory of Material Surface Technology, School of Material Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Changzhou China
| | - Wenyan Huang
- Jiangsu Key Laboratory of Material Surface Technology, School of Material Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Changzhou China
| | - Hongjun Yang
- Jiangsu Key Laboratory of Material Surface Technology, School of Material Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Changzhou China
| | - Li Jiang
- Jiangsu Key Laboratory of Material Surface Technology, School of Material Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Changzhou China
| | - Qimin Jiang
- Jiangsu Key Laboratory of Material Surface Technology, School of Material Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Changzhou China
| | - Bibiao Jiang
- Jiangsu Key Laboratory of Material Surface Technology, School of Material Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Changzhou China
- Changzhou University Huaide College Jingjiang China
| | - Sridhar Komarneni
- Materials Research Institute and Department of Ecosystem Science and Management, 204 Energy and the Environment Laboratory The Pennsylvania State University University Park Pennsylvania USA
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14
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Chen RY, Lai CJ, Chen YJ, Wu MX, Yang H. Omnidirectional / Unidirectional Antireflection-Switchable Structures Inspired by Dragonfly Wings. J Colloid Interface Sci 2021; 610:246-257. [PMID: 34923266 DOI: 10.1016/j.jcis.2021.12.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 11/29/2021] [Accepted: 12/04/2021] [Indexed: 10/19/2022]
Abstract
Randomly arranged irregular inclined conical structure-covered dragonfly wings, distinguished from periodic conical structure-covered cicada wings, are with high optical transparency for wide viewing angles. Bioinspired by the antireflective structures, we develop a colloidal lithography approach for engineering randomly arranged irregular conical structures with shape memory polymer-based tips. The structures establish a gradual refractive index transition to suppresses optical reflection in the visible spectrum. By manipulating the configuration of structure tips through applying common solvent stimulations or contact pressures under ambient conditions, the resulting unidirectional antireflection and omnidirectional antireflection performances are able to be instantaneously and reversibly switched. The dependences of structure shape, structure inclination, structure arrangement, and structure composition on the switchable antireflection capability are also systematically investigated in this study.
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Affiliation(s)
- Ru-Yu Chen
- Department of Chemical Engineering, National Chung Hsing University, 145 Xingda Road, Taichung City 40227, Taiwan
| | - Chung-Jui Lai
- Department of Chemical Engineering, National Chung Hsing University, 145 Xingda Road, Taichung City 40227, Taiwan
| | - You-Jie Chen
- Department of Chemical Engineering, National Chung Hsing University, 145 Xingda Road, Taichung City 40227, Taiwan
| | - Mei-Xuan Wu
- Department of Chemical Engineering, National Chung Hsing University, 145 Xingda Road, Taichung City 40227, Taiwan
| | - Hongta Yang
- Department of Chemical Engineering, National Chung Hsing University, 145 Xingda Road, Taichung City 40227, Taiwan
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15
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Zhou H, Xia Y, Mu G, Gao Y, Liang S, Li G, Yang Q, Lin X, Qian F. The preparation and characterization of biodegradable PCL/PLA shape memory blends. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2021. [DOI: 10.1080/10601325.2021.1921598] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Huimin Zhou
- Department of Materials Science, School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, China
| | - Ying Xia
- Department of Materials Science, School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, China
| | - Guangqing Mu
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
| | - Yuanmei Gao
- Department of Materials Science, School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, China
| | - Si Liang
- Department of Materials Science, School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, China
| | - Guozhong Li
- Department of Materials Science, School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, China
| | - Qian Yang
- Department of Materials Science, School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, China
| | - Xiaojian Lin
- Department of Materials Science, School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, China
| | - Fang Qian
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
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16
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Affiliation(s)
- Yuan Yao
- School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Tianjin University Tianjin 300350 China
| | - Meng Xiao
- School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Tianjin University Tianjin 300350 China
| | - Wenguang Liu
- School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Tianjin University Tianjin 300350 China
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17
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High Performance of Thermoplastic Polyurethane-Graphene Oxide Self-Healing Composite Film. COATINGS 2021. [DOI: 10.3390/coatings11020128] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Graphene oxide (GO) sheets were dispersed into N, N-dimethylformamide (DMF) solution by ultrasonication and then mixed with thermoplastic polyurethane (TPU) solution uniformly, and further fabricated to GO-TPU film by casting process. The thermal properties, infrared photothermal response, and self-healing performance of the GO-TPU film were systematically investigated. The experimental results demonstrate that the thermal conductivity of GO-TPU film with 4 wt % GO and the initial concentration of 20 wt % TPU is 0.3719 W·m−1·K−1, which is 83.8% increase compared to pure TPU. The GO-TPU film has excellent infrared light-to-heat conversion efficiency. The infrared light-to-heat conversion efficiency of the GO-TPU film with 7 wt % GO and the initial concentration of 20 wt % TPU reaches the maximum, and the temperature increased by 63% compared to pure TPU, reaching 165.6 °C. The scratches on the GO-TPU composite film can be completely healed after being irradiated by infrared light for 10 min, which shows that the GO-TPU composite film has good self-healing properties.
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Bhattacharya S, Hailstone R, Lewis CL. Thermoplastic Blend Exhibiting Shape Memory-Assisted Self-Healing Functionality. ACS APPLIED MATERIALS & INTERFACES 2020; 12:46733-46742. [PMID: 32931237 DOI: 10.1021/acsami.0c13645] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Here, we report on a polymer blend consisting of a soft thermoplastic polyurethane (TPU) elastomer and a low melting temperature thermoplastic healing agent (polycaprolactone, PCL). In this study, polymer blends containing up to 60 wt % PCL were prepared and the resulting mechanical, thermal, shape memory, and self-healing properties were studied. These immiscible polymers exhibit two well-separated transitions attributable to the melting of PCL and TPU hard segments. This viscoelastic behavior engendered shape memory capability at moderate processing temperatures (∼90 °C) and melt processability at elevated temperatures (>160 °C). The reversible plasticity shape memory (RPSM) effect was also characterized: when subjected to 125% strain at room temperature and subsequently heated to 90 °C, the samples nearly fully recovered to their original length. Moreover, upon heating to above PCL's melting temperature, the flow of PCL into an undeformed crack was shown to fill the crack void, thus promoting self-repair. Through the action of mild heating (90 °C/30 min), fracture surfaces are brought into intimate contact through the action of the RPSM effect and subsequently healed through the redistribution of molten PCL. The shape memory-assisted self-healing efficiency was evaluated by comparing the tensile force restoration after healing of a highly deformed, notched sample to its behavior prior to notching. It was observed that blends containing up to 30 wt % PCL showed nearly complete restoration of properties. In contrast, pure TPU showed only about 5% healing efficiency because of the absence of the PCL healing agent. Blends containing 50 and 60 wt % PCL likewise did not exhibit appreciable restoration of properties, and this was attributed to their propensity to neck during crack opening and poor mechanical properties at elevated temperatures. Blends may serve as a self-healing replacement for pure TPU in existing applications (e.g., automotive and sporting goods) or as a self-healing shape memory polymer in advanced products in soft robotic, biomedical, and microelectronic applications.
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Affiliation(s)
- Swapnil Bhattacharya
- Department of Mechanical Engineering, Rochester Institute of Technology, RochesterNew York 14623-5603, United States
| | - Richard Hailstone
- Center for Imaging Science, Rochester Institute of Technology, Rochester, New York 14623-5603, United States
| | - Christopher L Lewis
- Manufacturing and Mechanical Engineering Technology, Rochester Institute of Technology, Rochester, New York 14623-5603, United States
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