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Environmental Effects on the Dimensional Stability of Polymeric Glasses: Small Molecule Plasticizers

环境对聚合物玻璃尺寸稳定性的影响：小分子增塑剂

基本信息

批准号：
0070552
负责人：
Gregory McKenna
金额：
$ 32.5万
依托单位：
Texas Tech University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2000
资助国家：
美国
起止时间：
2000-04-01 至 2004-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0070552&HistoricalAwards=false
关键词：
Environmental Effects Dimensional Stability Polymeric

项目摘要

Novel experiments involving relative humidity-jumps (RH-jump) and carbon dioxide pressure-jumps (PCO2-jump) will be performed to investigate the structural recovery and physical aging responses of polymers subjected to rapid changes in plasticizing environment and chemical activity. The effects of PH or PCO2-jumps will be compared quantitatively to those induced by temperature-jumps. The comparisons will test the underlying hypothesis that changes in plasticizer content are quantitatively similar to changes in temperature for glass-changes in plasticizer content are quantitatively similar to changes in temperature for glass-forming systems. The classic TNM-KAHR models of aging and structural recovery will be extended to include plasticizer effects and compared quantitatively with the experimental data.Modern uses of plastics demand that they show dimensional stability and moisture resistance for both short and long time durations. Electronic, automotive and infrastructure applications demand increasingly sophisticated data and model of the impact of plasticizing molecules such as water and carbon dioxide on the performance of polymers. The proposed work may provide unique and fundamental data that tests the validity of models used to describe the mechanical and dimensional behavior of plastics in such environments.

将进行涉及相对湿度跳跃（RH-跳跃）和二氧化碳压力跳跃（PCO2-跳跃）的新颖实验，以研究聚合物在塑化环境和化学活性快速变化下的结构恢复和物理老化响应。 PH 或 PCO2 突变的影响将与温度突变引起的影响进行定量比较。这些比较将检验以下基本假设：增塑剂含量的变化在数量上与玻璃温度的变化相似——增塑剂含量的变化在数量上与玻璃形成系统的温度变化相似。老化和结构恢复的经典 TNM-KAHR 模型将扩展到包括增塑剂效应，并与实验数据进行定量比较。塑料的现代用途要求它们在短期和长期内表现出尺寸稳定性和防潮性。电子、汽车和基础设施应用需要越来越复杂的数据和模型来了解水和二氧化碳等增塑分子对聚合物性能的影响。拟议的工作可以提供独特的基本数据，测试用于描述塑料在此类环境中的机械和尺寸行为的模型的有效性。