Diffusion and Segregation in Polymer Films

聚合物薄膜中的扩散和偏析

• 批准号: 9223099
• 负责人: Edward Kramer
• 金额: $ 66.05万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-04-15 至 1998-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9223099&HistoricalAwards=false
• 关键词: Diffusion; Segregation; Polymer; Films

We will continue our experiments on diffusion and segregation in polymer films, exploiting the complementary depth profiling capabilities of forward recoil spectrometry, nuclear reaction analysis, dynamic secondary ion mass spectrometry and neutron reflectometry for polymer molecules labelled with deuterium. Emphasis will be placed on understanding diffusion in microphase- separated block copolymer melts with spherical morphologies, where we will investigate both the diffusion of individual block copolymer chains and the diffusion of micelles. Emphasis will also be placed on understanding surface segregation in model mixtures of polymers, with both the details of the equilibrium concentration profile and the kinetics with which such equilibrium profiles are approached being of interest. Finally the influence of a surface attraction on phase separation by spinodal decomposition in polymer films will be further explored. The goals of this research are to develop new experimental methods for investigating the fundamental aspects of diffusion in polymers and to use these methods to critically test models of these processes. Diffusion of one polymer into another plays an important role in a variety of industrial processes ranging for melt blending of miscible polymers to friction welding and heat sealing of plastics. Basic information on diffusion rates is also required to allow predictions on the kinetics of phase separation in partially compatible polymers and to permit comparison between theory and experiments on polymer crystallization. On an even more basic level, diffusion measurements in polymers are of interest for the light they can shed on the fundamentals of viscoelastic processes ("molecular rheology") in polymer melts.

我们将继续进行扩散和分离的实验， 聚合物薄膜，利用互补的深度剖析 前向反冲光谱法、核反应 分析、动态二次离子质谱和中子 用氘标记的聚合物分子的反射计。 重点将放在理解微相扩散- 具有球形形态的分离的嵌段共聚物熔体，其中 我们将研究单个块的扩散 共聚物链和胶束的扩散。 重点还将 放在理解模型混合物中的表面偏析上， 聚合物，与平衡浓度的细节 平衡曲线和这种平衡曲线的动力学 接近感兴趣。 最后，表面的影响 聚合物中旋节线分解相分离的引力 电影将进一步探索。 本研究的目的是发展新的实验方法 用于研究聚合物中扩散的基本方面 并使用这些方法来严格测试这些模型 流程. 一种聚合物扩散到另一种聚合物中， 在各种工业过程中发挥重要作用， 可混溶聚合物的熔融共混到摩擦焊接和加热 塑料的密封。 扩散率的基本信息也是 需要允许预测相分离的动力学 在部分相容的聚合物中， 聚合物结晶理论与实验。 对咨询意见的需求也更为 基本水平，聚合物中的扩散测量是感兴趣的， 他们可以阐明粘弹性的基本原理， 聚合物熔体中的分子流变学。