Intermolecular Bonding and Microphase Separation in Multiblock Copolymers

多嵌段共聚物中的分子间键合和微相分离

• 批准号: 9016959
• 负责人: Stuart Cooper
• 金额: $ 17.9万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-01-01 至 1992-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9016959&HistoricalAwards=false
• 关键词: Intermolecular; Bonding; Microphase; Separation; Multiblock

The three general directions of study are aimed at gaining a quantitative understanding of phase separation in multiblock polymers. The first direction intends to address the microphase separation transition (MST) in polyurethane systems using small- angle x-ray scattering (SAXS), differential scanning calorimetry (DSC), and melt rheometry. Simplified polyurethane systems will be studied which minimize complications due to hard segment crystallization and thermal degradation. The second direction addresses the problem of crystallization in multiblock polymers. A study of the relationship between crystallization and the MST is proposed using a polyurethane system whose MST may be altered relative to the hard segment melting point. A SAXS study of crystallization and annnealing processes in poly(ether-ester) copolymers is also proposed, emphasizing changes in hard domain morphology occuring during recrystallization after melting. Complementary to these studies is work aimed at understanding the role of polymerization conditions on spherulitic texture development. The third, and final direction of study is the use of solid-state NMR techniques to characterize polyurethane morphology. Model hard segment compounds will be investigated using cross polarization/magic-angle spinning techniques with C-13 as the probe nucleus. This work will be complemented with proton NMR studies in order to gain an understanding of site-specific mobilities in the hard domains. This work will be extended to polyether-polyurethane copolymers with an aim toward characterization of the interfacial regions.

这三个研究方向的目的是获得一个 多块体相分离的定量认识 聚合物 第一个方向旨在解决微相 分离过渡（MST）在聚氨酯系统中使用小- 角X射线散射（SAXS），差示扫描量热法 (DSC)和熔体流变测定法。 简化的聚氨酯系统将 研究了最大限度地减少硬节段引起的并发症 结晶和热降解。 第二方向 解决了多嵌段聚合物中的结晶问题。 研究了结晶与MST之间的关系， 建议使用聚氨酯系统，其MST可以改变 相对于硬链段熔点。 小角X射线散射研究 聚醚酯的结晶和退火过程 还提出了共聚物，强调硬域的变化 熔融后再结晶过程中出现的形态。 作为这些研究的补充， 聚合条件对球晶织构的影响 发展 第三，也是最后一个研究方向是使用 固态NMR技术来表征聚氨酯形态。 模型硬段化合物将使用交叉 以C-13为探针的偏振/魔角旋转技术 原子核 这项工作将补充质子核磁共振研究， 为了获得对特定地点的流动性的理解， 硬域 本工作将扩展到聚醚聚氨酯 共聚物，目的是表征界面 地区