School of Materials Science and Engineering, Tianjin University , Tianjin 300072, P. R China.
Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, Tianjin 300072, P. R China.
ACS Appl Mater Interfaces. 2017 Feb 1;9(4):4066-4073. doi: 10.1021/acsami.6b15075. Epub 2017 Jan 20.
Multistimuli-responsive polymers are materials of emerging interest but synthetically challenging. In this work, supramolecular assembly was employed as a facile and effective approach for constructing 3,3',5,5'-azobenzenetetracarboxylic acid (Habtc)/poly(diallyldimethylammonium chloride) (PDAC) supramolecules. Structural transformations of Habtc can be induced by light, mechanical force, and heat and influenced by free volume. Thus, the fabricated free-standing Habtc/PDAC film underwent bending/unbending movements upon treatment with light, humidity, or temperature, as asymmetric structural transformations on either side of the film generated asymmetric contraction/stretching forces. Fast rates of shape recovery were achieved for the film on exposure to gently flowing humid nitrogen. The bending/unbending motions are controllable, reversible, and repeatable. Hence, this light-, humido-, and thermo-responsive film has great potential in device applications for advanced functions.
多重刺激响应聚合物是新兴的研究热点，但在合成上具有挑战性。在这项工作中，超分子组装被用作构建 3,3',5,5'-偶氮苯四羧酸（Habtc）/聚二烯丙基二甲基氯化铵（PDAC）超分子的简便有效方法。Habtc 的结构转变可以由光、机械力和热诱导，并受自由体积影响。因此，所制备的自由站立的 Habtc/PDAC 薄膜在受到光、湿度或温度处理时会发生弯曲/伸直运动，因为薄膜两侧的不对称结构转变会产生不对称的收缩/拉伸力。当薄膜暴露于温和流动的氮气中时，能够快速实现形状恢复。弯曲/伸直运动是可控的、可逆的和可重复的。因此，这种对光、湿度和温度响应的薄膜在用于先进功能的器件应用中具有很大的潜力。
