Ultrastructural Studies of Polymers

聚合物的超微结构研究

• 批准号: 8907433
• 负责人: Edwin Thomas
• 金额: $ 30.49万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-06-01 至 1992-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8907433&HistoricalAwards=false
• 关键词: Ultrastructural; Studies; Polymers

This research deals with two areas of polymer materials research (1) phase transitions, morphology, and properties of block copolymers; and (2) high-resolution electron microscopy (HREM) of crystalline polymers. The first area involves the detailed study of neat linear and star diblock copolymers and block copolymer/homopolymer blends as concerns order-disorder transitions and order-order transitions. Emphasis will be placed on understanding the molecular parameters which govern phase morphology and stability. Both small and especially large-strain mechanical behavior of these model ordered microcomposites will be examined and related to the evolution of domain morphology with extent of deformation. The word in HREM will focus on understanding the details of chain packing in flexible chain-folded crystals particularly as regards regions where the chain arrangement reflects fundamental information on crystal growth (primary nucleus, twin boundaries, reentrant growth fronts). The main investigative techniques are transmission electron microscopy diffraction, small-angle x-ray scattering, digital image analysis, computer graphics of surfaces and mechanical testing. The goal of the research is to contribute to the basic understanding of structure-property relationships which can provide a basis for development of materials and improvement of their properties.

本研究涉及高分子材料研究的两个领域 (1)块体的相变、形态和性质 共聚物;和（2）高分辨率电子显微镜（HREM）的 结晶聚合物。 第一个领域涉及到对纯线性的详细研究 和星星二嵌段共聚物和嵌段共聚物/均聚物 共混物涉及有序-无序转变和有序-有序 过渡。 重点将放在理解 控制相形态和稳定性的分子参数。 小应变和特别是大应变的力学行为， 这些模型有序微复合材料将被检查和相关 畴形态随变形程度的演变。 这个词在HREM将侧重于了解的细节 柔性链折叠晶体中的链堆积， 考虑到链安排反映了基本的 关于晶体生长的信息（初生核，孪晶边界， 重入增长前沿）。 主要的侦查手段是透射电子 显微衍射，小角x射线散射，数字 图像分析，表面和机械的计算机图形 试验. 研究的目标是为基础的 理解结构-性质关系， 为材料的开发和改进提供基础 他们的财产。