Jiang Zhi-Chao, Xiao Yao-Yu, Kang Yang, Li Bang-Jing, Zhang Sheng
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, 610065, China.
Chengdu Institute of Biology, Chinese Academy of Science, Chengdu, 610041, China.
Macromol Rapid Commun. 2017 Jul;38(14). doi: 10.1002/marc.201700149. Epub 2017 May 23.
Moisture or water has the advantages of being green, inexpensive, and moderate. However, it is challenging to endow water-induced shape memory property and self-healing capability to one single polymer because of the conflicting structural requirement of the two types of materials. In this study, this problem is solved through introducing two kinds of supramolecular interactions into semi-interpenetrating polymer networks (semi-IPNs). The hydrogen bonds function as water-sensitive switches, making the materials show moisture-induced shape memory effect. The host-guest interactions (β-cyclodextrin-adamantane) serve as both permanent phases and self-healing motifs, enabling further increased chain mobility at the cracks and self-healing function. In addition, these polyvinylpyrrolidone/poly(hydroxyethyl methacrylate-co-butyl acrylate) semi-IPNs also show thermosensitive triple-shape memory effect.
水分或水具有绿色、廉价且适度的优点。然而，由于这两种材料相互冲突的结构要求，要赋予单一聚合物水致形状记忆特性和自愈能力具有挑战性。在本研究中，通过将两种超分子相互作用引入半互穿聚合物网络（semi-IPNs）来解决这一问题。氢键充当水敏开关，使材料呈现湿度诱导的形状记忆效应。主客体相互作用（β-环糊精-金刚烷）既作为永久相又作为自愈基序，能够进一步提高裂纹处的链流动性并实现自愈功能。此外，这些聚乙烯吡咯烷酮/聚（甲基丙烯酸羟乙酯-丙烯酸丁酯）半互穿聚合物网络还表现出热敏三重形状记忆效应。
