具有形状记忆性能的P(MMA-co-HEA)/PDMS-OH氢键复合物的研究

选择低分子量端羟基聚二甲基硅氧烷(PDMS-OH)与聚(甲基丙烯酸甲酯-co-丙烯酸β-羟乙酯)P(MMA-co-HEA)共聚物原位复合形成氢键复合物,该复合物表现出良好的形状记忆效应.通过FTIR,SEM对材料的结构和形貌进行表征,DMA表征材料的动态力学行为,并通过弯曲实验对材料的形状记忆性能进行了表征及比较.FTIR分析证明PDMS-OH与P(MMA-co-HEA)共聚物形成氢键缔合作用;SEM分析显示,随着PDMS-OH含量的升高,氢键复合物由"海-岛"相分离结构向反转相分离结构转变;DMA分析结果表明,氢键的引入有利于复合物获得更高的模量比;形状记忆性能测试结果显示该氢键复合物具有良好的形状记忆性能,形状记忆固定率超过98%、形变恢复率超过99%,并且与聚(甲基丙烯酸甲酯-co-丙烯酸乙酯)/PDMS-OH(P(MMA-co-EA)/PDMS-OH)复合物相比,氢键复合物显示出更快的形变回复速率.

SHAPE MEMORY HYDROGEN-BONDED P(MMA-co-HEA)/PDMS-OH COMPLEXES

A new type of shape-memory poly(methyl methacrylate-co-2-hydroxyethyl acrylate)/hydroxyl terminated polydimethylsiloxane(P(MMA-co-HEA)/PDMS-OH) hydrogen-bonded complexes were obtained by the copolymerization of MMA and HEA on the presence of PDMS-OH.The chemical structures,morphologies and dynamical mechanical properties of these hydrogen-bonded complexes were determined by FTIR,SEM and DMA analysis.The results show that the content of PDMS-OH significant impacts on the morphology of P(MMA-co-HEA)/PDMS-OH hydrogen-bonded complexes.The morphology of hydrogen-bonded complexes transform from sea-islands structure to inversed phase structure when the weight content of PDMS-OH increases from 20% to 30%.Shape-memory effects of hydrogen-bonded complexes were studied by bending tests.The results show that P(MMA-co-HEA)/PDMS-OH complexes achieved excellent shape memory properties with strain fixity ratio of above 98% and strain recovery ratio of above 99%.Compared to poly(methyl methacrylate-co-ethyl acrylate)/PDMS-OH(P(MMA-co-EA)/PDMS-OH) complexes,P(MMA-co-HEA)/PDMS-OH hydrogen-bonded complexes exhibit higher modulus ratio owing to the hydrogen-bonding.Furthermore,the recovery speed of hydrogen-bonded complex is faster than that of the P(MMA-co-EA)/PDMS-OH at the same temperature conditions.