Relaxation Studies on Glassy Polymers

玻璃态聚合物的弛豫研究

• 批准号: 8520789
• 负责人: Robert Yaris
• 金额: $ 51.09万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1986
• 资助国家: 美国
• 起止时间: 1986-05-01 至 1991-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8520789&HistoricalAwards=false
• 关键词: Relaxation; Studies; Glassy; Polymers

Studies are conducted on the dynamics and relaxation behavior of glassy polymers. Experimentally, the methods of modern high-resolution NMR of solids will be used in conjunction with a recently developed dilatometry technique as a probe of the molecular motions and chain-packing effects in glassy polymers. In particular, the investigator will perform so-called CPMAS NMR experiments on polycarbonates under high carbon dioxide pressure to obtain information on the effects of absorbed gas molecules on the molecular motions and chain packing. The investigator will also use multiple quantum NMR to obtain new information about the extent of correlated motion of the polymer in the glass and to correlate the NMR experiments with macroscopic properties, e.g. dynamic mechanical loss. Theoretically, the investigator will use a combination of computer simulations, phenomenological model building, and statistical mechanics to understand the relaxation processes in glassy polymers.

研究了玻璃态的动力学和弛豫行为， 聚合物 在实验上，现代高分辨核磁共振方法， 固体将与最近开发的 作为分子运动探针的分子量测量技术， 玻璃态聚合物中的链堆积效应。 特别是 研究人员将进行所谓CPMAS NMR实验， 聚碳酸酯在高二氧化碳压力下， 吸附气体分子对分子运动的影响， 链式包装 研究人员还将使用多量子NMR， 获得关于所述运动的相关运动的程度的新信息， 聚合物在玻璃和相关的核磁共振实验与 宏观特性，例如动态机械损耗。 从理论上讲， 研究人员将使用计算机模拟的组合， 现象学模型的建立和统计力学， 了解玻璃状聚合物的松弛过程。