Conformations and Mobilities of Polymer Chains in Narrow Channels of Their Crystalline Inclusion Compounds

结晶包合物窄通道中聚合物链的构象和迁移率

• 批准号: 9201094
• 负责人: Alan Tonelli
• 金额: $ 20.98万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-08-15 至 1996-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9201094&HistoricalAwards=false
• 关键词: Conformations; Mobilities; Polymer; Chains; Narrow

Among solid polymer phases, the crystalline inclusion compounds (IC) formed between guest polymer chains and small-molecule host clathrates are unique. In inclusion compounds guest polymer chains are confined to narrow channels whose walls are formed by the host clathrate matrix, and, as a consequence, are isolated from all neighboring polymer chains. The net result is a solid crystalline phase where polymer chains are well-separated from their neighbors. This environment affords the opportunity to study isolated, yet solid, polymer chains as they conform and move in their IC channels, where they are free from the influences of neighboring polymer chains, which in bulk polymer phases are often highly cooperative and complex. Differential thermal analysis, X-ray, Fourier transform infrared, and especially solid-state Nuclear magnetic resonance observations of polymers in inclusion compounds and their comparison to bulk polymer observations should permit an assessment of the inherent mobilities and conformations of solid polymers and help us to evaluate the effects of constraining environments (narrow channels) on the same. Ultimately, an attempt will be made to spin and draw fibers from their inclusion compounds with the hope that the highly extended and isolated polymer chains will produce fibers with improved strengths because of their high extensions and the absence of a chain folded morphology when they are coalesced.

在固体聚合物相中，客体高分子链和小分子包合物之间形成的结晶包合物(IC)是独一无二的。在包合物中，客体聚合物链被限制在狭窄的通道中，其壁由主体包合物基质形成，因此与所有相邻的聚合物链隔离。最终的结果是一种固体结晶相，其中聚合物链与它们的邻居很好地分开。这种环境为研究孤立但固体的聚合物链提供了机会，因为它们在IC通道中顺应和移动，不受邻近聚合物链的影响，这些聚合物链在本体聚合物相中通常是高度合作和复杂的。包合物中聚合物的差热分析、X射线、傅里叶变换红外，特别是固态核磁共振观测，以及它们与整体聚合物观测的比较，应该能够评估固体聚合物的固有迁移率和构象，并帮助我们评估约束环境(狭窄通道)对其的影响。最终，人们将尝试从它们的包裹体化合物中纺丝和拉伸纤维，希望高度延伸和孤立的聚合物链将产生强度更高的纤维，因为它们延伸得很高，并且当它们结合时没有链折叠的形态。