基于金属-配体络合作用的多响应PPDO-PEG动态交联网络的制备及其形状记忆和自修复行为研究

项目名称： 基于金属-配体络合作用的多响应PPDO-PEG动态交联网络的制备及其形状记忆和自修复行为研究

项目编号： No.51473096

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 杨科珂

作者单位： 四川大学

项目金额： 85万元

中文摘要： 近年来，形状记忆高分子材料已向多刺激响应、多重形状记忆和多功能化方向发展。本项目拟采用金属-配体络合作用，将链段中含有多个联二吡啶双齿配体的聚对二氧环己酮(PPDO)-聚乙二醇(PEG)线性多嵌段共聚物通过与金属离子络合构筑ML-PDEG动态交联网络。利用金属-配体络合作用较高的键合强度，络合交联点可充当形状记忆材料的固定相，PPDO和PEG链段充当可逆相，材料可显示出热致三重形状记忆行为；而利用金属-配体络合作用的动态可逆性，络合交联点又可充当形状记忆材料的分子开关，PPDO链段充当固定相，通过紫外光控程序启动金属-配体络合作用的解离和再键合，材料可显示出光致形状记忆行为；在材料受到破坏时，这种动态可逆性又可赋予材料自修复功能。研究PPDO和PEG的共聚比例、配体在共聚物中的分布方式及密度、金属离子种类对材料形状记忆性能和自修复性能的影响，制备出综合性能优异的新型多功能智能材料。

中文关键词： 形状记忆聚合物；自修复；金属-配体络合作用；动态交联网络；多响应

英文摘要： In recent years, multiple response, multiple shape and multiple functionality become the new trend in the research field of the shape memory polymers. For the architecture design of the multiple shape polymers, the traditional polymer networks based on covalent bond were widely used, however,this type of network has its own limitation in processing compared with thermoplastic polymers. Recently, a new concept of utilizing reversible non-covalent bond to construct dynamic reversible network has been highly concerned.Among the various non-covalent bond such as hydrogen bond,π-π stacking,gest-host interaction, hydrophobic interaction and so on,metal-ligand coordination is most attractive owing to its high bond energy,multi-responsibility and reversibility with high efficiency. This project aims to develop a novel poly(p-dioxanone)-poly(ethylene glycol) dynamic crosslink network based on metal-ligand coordination (ML-PDEG), and the architecture of polymer networks could be well-defined by varying the type of metal ions and ligand, polymer precursors and the synthetic route. Accordingly, the metal-ligand coordination bond can be act as netpoints in the shape-memory mode,meanwhile,the PPDO and PEG segments can be act as the reversible phases, material may show thermally-induced triple shape effect. Furthermore, the metal-ligand coordination bond also can be serve as the molecular switch in the shape-memory mode while PPDO serve as fixing phase, then, the material exhibits light-induced shape memory effect. More important, it also plays an important role to trigger the self-healing behaviors. The inflence of architecture of the networks, the influence of distribution and the density of the metal-ligand coordination points in the hard and soft segments on the shape-memory effects and the self-healing performance will be investigated systematically. This smart material combines the virtue of excellent performance of dynamic network both on shape-memory polymers and self-healing materials, which will broaden the scope of applications of this novel dynamic networks.

英文关键词： Shape-memory polymer;self-healing;metal-ligand coordination;Dynamic networks;multi-respone