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

旋转聚合物的固态动力学、相结构和性能

• 批准号: 0072876
• 负责人: Haskell Beckham
• 金额: $ 26万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-01 至 2004-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0072876&HistoricalAwards=false
• 关键词: Solid; State; Dynamics; Phase; Structure

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.

我们将用各种分析技术来研究轮税聚合物，以确定这类材料的结构/流动性/性能关系。基于非常不同的大环组分，描述了两种类型的多轮烷：(1)冠醚和(2)环糊精。在以冠醚为基础的轮烷化聚合物中，大环通常比主链更具流动性。在基于环糊精的轮烷基化聚合物中，大环形成刚性的氢键隧道，在其中线性聚合物主链可以表现出比没有螺纹化时更大的流动性。我们将探讨和比较这些动态架构对整体物理特性的影响。特别是，将研究一系列基于冠醚的轮烷化聚合物的冲击强度和微相分离作为大循环负载的函数。通过线性聚合物与环糊精的轮烷化反应，将制备和评价两种新的结构：(1)轮烷化和非轮烷化链段的关节结构；(2)螺纹式交联。热性能和力学性能将与通过固体核磁共振、X射线散射和电子显微镜获得的固体动力学和相结构信息相关联。这项研究是在新型聚合物和有机材料的表征领域。