作　　者： (黄华华）; (胡金莲）;

机构地区： 中山大学材料科学与工程学院,广东广州510275 香港理工大学应用科学与纺织系,香港999077

出　　处： 《石油化工》 2017年第6期763-766,共4页

摘　　要： 基于亲水性天然高分子明胶为记忆开关、聚氨酯弹性体为网络节点,通过共混技术,制得水敏感型形状记忆材料,开发了一种具有水响应形状记忆功能、制备简单易得的智能材料。采用SEM和DMA表征材料的形貌和热性质。表征结果显示,明胶与聚氨酯具有良好相容性,有利于共混体系的稳定,同时明胶的玻璃化转变温度在水分子作用下可降至室温,是其作为水响应记忆开关的关键因素。实验结果表明,通过记忆程序设计研究发现该材料的形状回复时间和回复率可在一定范围内进行调节,且形状固定率都超过70%;经动态机械行为研究发现明胶的加入可显著提高弹性体基材的储能模量(E′),而记忆驱动力正来源于材料的E′在水作用前后的急剧变化。 This article reported a simple method to explore a new smart material with water-sensitive shape-memory function. Hydrophilic natural gelatin was used as the switch,and polyurethane elastomer（TPU） was as the network,to obtain shape-memory blends. The morphology and thermal properties of blends were studied by SEM and DMA,respectively. It indicated that there was good compatibility between gelatin and TPU phases. The glass transition temperature of gelatin could be reduced to room temperature when immersed into water,which reflected that gelatin can be used as the water-sensitive switch. It was found that shape recovery time and recovery ratio of the blends could be adjusted in a certain range,and their shape fixity ratio values were high,over than 70%,according to the designed shape-memory programming. Dynamic mechanical behavior of blends was also investigated,and the result indicated that storage modulus of TPU matrix could be significantly improved by the addition of gelatin. The driving force of shape-memory function of these blends is from the drastic change of their storage modulus.

关 键 词： 形状记忆聚合物 水敏感 明胶 聚氨酯弹性体