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

新的实验涉及相对湿度跳跃（RH-跳跃）和二氧化碳压力跳跃（PCO 2-跳跃）将进行调查的结构恢复和物理老化反应的聚合物进行快速变化的塑化环境和化学活性。 PH或PCO 2跃变的影响将与温度跃变引起的影响进行定量比较。 比较将测试基本假设，即增塑剂含量的变化在数量上类似于玻璃的温度变化-增塑剂含量的变化在数量上类似于玻璃形成系统的温度变化。 经典的老化和结构恢复的TNM-KAHR模型将扩展到包括增塑剂的影响，并与实验数据进行定量比较。现代塑料的使用要求它们在短时间和长时间内都表现出尺寸稳定性和防潮性。 电子、汽车和基础设施应用对水和二氧化碳等增塑分子对聚合物性能影响的数据和模型的要求越来越高。 拟议的工作可以提供独特的和基本的数据，测试用于描述塑料在这种环境中的机械和尺寸行为的模型的有效性。

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.