The Influence of Chemical Microstructure and Pressure on theMechanisms of Crystallization in Polymers

化学微观结构和压力对聚合物结晶机理的影响

• 批准号: 9107675
• 负责人: Paul Phillips
• 金额: $ 22.5万
• 依托单位: University of Tennessee Knoxville
• 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: 1991-05-01 至 1994-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9107675&HistoricalAwards=false
• 关键词: Influence; Chemical; Microstructure; Pressure; theMechanisms

There are many variables that affect the physical and mechanical properties of crystalline polymers through the processing and fabrication stages of manufacture. Four of the most important are temperature, pressure, molecular weight, and chain microstructure. The long-term objective of this research is to understand the way in which all four of these variables interact in determining the details of the crystallization process. Building on past work, the synergistic effects of these variables will be investigated for several systems. Several recent important developments in crystallization theory will be investigated for homopolymers and copolymers based principally on polyethylene, polypropylene, and some semi-rigid polymers. The research will enable quantitative analysis to be made of crystallization theories. It will help unravel the complicated synergisms of the variables referred to above. In addition it will investigate the dependence on pressure- temperature of the phase transformations in polypropylene, which may be of significance to the development of new processing methods. Much of the basic aspects of the research will involve experimental and theoretical approaches to this essential, but relatively unexplored, feature of crystallization.

有许多变量会影响物理和机械性能 结晶聚合物通过加工和 制造阶段。 其中最重要的四个是 温度、压力、分子量和链微观结构。 这项研究的长期目标是了解 其中所有四个变量相互作用， 结晶过程的细节。 在过去工作的基础上， 将研究这些变量的协同效应， 几个系统。 最近的一些重要发展， 结晶理论将研究均聚物和 主要基于聚乙烯、聚丙烯和 一些半刚性聚合物 该研究将使定量 结晶理论分析。 它将帮助 解开所提到的变量的复杂协同作用 以上 此外，它将研究对压力的依赖性- 聚丙烯的相变温度， 可能对新工艺的开发具有重要意义 方法. 研究的许多基本方面将涉及 实验和理论的方法，但 相对未开发的结晶特征。