POSS-POSS相互作用对高分子形状记忆行为的影响研究

本项目建议采用不同的聚合以及大分子反应方法，将一系列具有不同R基团的单官能度、二官能度以及八官能度POSS引入形状记忆聚合物中，一方面提高形状记忆性能，如形状转变温度、形变回复性方法能及形状记忆聚合物的力学强度等，另一方面提高形状记忆聚合物的加工性能。我们拟分别通过调控POSS的R基团类型以及控制含POSS-高分子网链的构造方式来调控形状记忆聚合物中的POSS-POSS之间的相互作用，重点研究：i) 研究由纳米尺度上POSS微相构成的物理交联与传统的分子水平上化学交联的对形状记忆性能的影响的差别；ii) 研究由POSS-POSS相互作用的形成对性状记忆高分子的热转变行为和力学强度的影响，表征POSS微相对形状记忆聚合物的纳米增强作用；iii)充分利用POSS微相的物理交联提高形状记忆聚合物的加工性能。

In this project, we propose to incorporate a series of polyhedral oligomeric silsesquioxanes (POSS) with various R groups, functionality into shape memory polymers (SMPs) via different polymerization and inter-macromolecular reaction approaches, the purpose is: i) to improve the shape memory properties such as shape transition temperatures, recovery properties of shapes and mechanical strength and ii) to improve the processing properties of SMPs. The POSS-POSS interactions will be modulated through: i) changing the types of R groups in POSS macromers and ii) controlling the architectures of the POSS-containing SMPs. In this work, the effects of the following two crosslinking types on shape memory behavior would be examined: i) the physical crosslinking resulting from the POSS microdomains and ii) the conventional chemical crosslinking via the formation of chemical bonds. The effect of POSS-POSS interactions on thermal transitional behavior and mechanical strength will be investigated in terms of the nanoreinforcement of POSS microdomains on SMPs. The considerable physical crosslinking via POSS-POSS interactions remind of the preparation of the SMPs with thermoplastic and castable properties.