Solid-State Dynamics, Phase Structure, and Properties of Rotaxanated Polymers

将用各种分析技术检查旋转掺杂聚合物，以建立这类材料的结构/流动性/性能关系。 基于非常不同的大环组分描述了两种类型的聚轮烷：（1）冠醚，和（2）环糊精。 在基于冠醚的轮黄烷化聚合物中，大环通常比主体主链更移动的。 在基于环糊精的轮黄烷化聚合物中，大环形成刚性氢键隧道，其中线性聚合物主链可以表现出比未螺纹化时更大的移动性。 将探讨和比较这些动态架构对散装物理性能的影响。 特别是，冲击强度和微相分离将研究一系列冠醚为基础的轮烷酸聚合物作为大环负载的函数。 两种新的结构将制备和评价从线性聚合物与环糊精的轮黄烷化：（1）轮黄烷化和非轮黄烷化链段的铰接结构，和（2）螺纹交联。 热性能和机械性能将与通过固态NMR、X射线散射和电子显微镜获得的固态动力学和相结构信息相关联。本研究属于新型聚合物和有机材料的表征领域。

Rotaxantated polymers will be examined with a variety of analytical techniques to establish structure/mobility/property relationships for this class of materials. Two types of polyrotaxanes are described based on very different macrocyclic components: (1) crown ethers, and (2) cyclodextrins. In crown-ether-based rotaxanated polymers, the macrocycle is typically more mobile than the host backbone. In cyclodextrin-based rotaxanated polymers, the macrocycles form rigid hydrogen-bonded tunnels inside which the linear polymer backbones can exhibit greater mobility than when not threaded. The consequences of these dynamic architectures on bulk physical properties will be explored and compared. In particular, impact strength and microphase separation will be investigated for a series of crown-ether-based rotaxanated polymers as a function of macrocycle loading. Two novel constructions will be prepared and evaluated from the rotaxanation of linear polymers with cyclodextrins: (1) articulated structures of rotaxanated and nonrotaxanated chain segments, and (2) threaded crosslinking. Thermal and mechanical properties will be correlated with information on solid-state dynamics and phase structures obtained through solid-state NMR, x-ray scattering, and electron microscopy.This research is in the area of characterization of novel polymeric and organic materials.