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微相分离结合氢键复合构筑弹性体 被引量:3

Combining Microphase Separation and Hydrogen-bonding Complexation to Construct Elastomer
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摘要 通过嵌段聚合物的微相分离和高分子氢键复合,使用聚苯乙烯-b-聚丙烯酸-b-聚苯乙烯(SAS)三嵌段聚合物和聚氧化乙烯(PEO)均聚物构筑了具有多层次结构的弹性体(SA/E).聚丙烯酸(PAA)与PEO形成柔性的氢键复合物(PAA/PEO),刚性的聚苯乙烯(PS)与PAA和PEO不相容而发生微相分离,PS作为交联点连接着柔性的PAA/PEO.与PAA/PEO氢键复合物相比,SA/E弹性体力学性能明显提升,通过控制PS质量分数可调节弹性体的模量和强度等力学性能.SA/E弹性体表现出湿度敏感性.并且弹性体经拉伸训练后可获得一定的取向性,弹性回复率保持在98%以上.本弹性体在湿度传感、柔性器件、医用材料等领域具有潜在应用,为构筑新型弹性体提供思路. By integrating the microphase separation and hydrogen-bonding complexation,here,triblock copolymer polystyrene-b-poly(acrylic acid)-b-polystyrene(SAS)and homopolymer poly(ethylene oxide)(PEO)were used to construct the elastomer(SA/E)with different hierarchical structures.Poly(acrylic acid)(PAA)and PEO can form flexible and stretchable hydrogen-bonded complex.Polystyrene(PS)is neither compatible with PAA nor PEO,and the microphase separation structure will be formed when SAS is associated with PEO.The vitrified PS domains acted as physical cross-link points for soft PAA/PEO hydrogen-bonding complex domains.Compared with PAA/PEO homopolymer hydrogen-bonding complex,the SA/E elastomer shows higher modulus and strength,while maintain the considerable breaking elongation.By changing the PS molecular weight fraction,the SA/E can assemble to various microphase structures and present different mechanical and elastic properties.In addition,the SA/E shows excellent humidity adaptable behavior.The SA/E has different mechanical strengths at different relative humidity conditions.The moisture absorbed in SA/E can serve as plasticizer to enhance the flexibility of PAA/PEO hydrogen-bonding complex domains.Moreover,by cyclic stretching-releasing training,the elastic recovery ratio of SA/E is significantly improved,up to 98%.The elastomer has potential application in smart sensors,flexible devices,and advanced medical materials.This research also provides new methods and ideas for constructing new elastic materials.
作者 王伟杰 张彩虹 黄浩 刘泽新 简韩鑫 杨曙光 Wei-jie Wang;Cai-hong Zhang;Hao Huang;Ze-xin Liu;Han-xin Jian;Shu-guang Yang(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Center for Advanced Low-dimension Materials,College of Material Science and Engineering,Donghua University,Shanghai 201620)
出处 《高分子学报》 SCIE CAS CSCD 北大核心 2023年第4期487-495,共9页 Acta Polymerica Sinica
基金 国家自然科学基金(基金号51973029) 教育部装发联合基金(基金号8091B022141)资助。
关键词 弹性体 高分子复合物 嵌段聚合物 微相分离 氢键复合 Elastomer Polymer complex Block-copolymer Microphase separation Hydrogen-bonding association
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