Towards Establishing General Principles of Toughening of Engineering Polymers: Studies into Intrinsic Material Properties

9523078 YEE该项目旨在推动抗断裂工程塑料和聚合物基复合材料的发展。它将发展增韧科学的基础知识，并将在产品开发和安全方面为聚合物工业提供指导。橡胶粒子剪切屈服增韧和热塑性粒子微裂解/银纹/桥联增韧是改善材料性能的两种最重要的增韧方法。这两种机制之间的一个基本联系是聚合物的本征应力状态相关的变形。识别增强颗粒附近的应力状态和表征在这种应力状态下基质的变形是关键问题。只有通过对聚合物变形的实验研究和对增韧机理细节的定量分析才能解决这些问题。***

9523078 Yee This project is to advance the development of fracture-resistant engineering plastics and polymer-matrix composite materials. It will develop fundamental knowledge in the science of toughening, and will provide guidance to the polymer industry in product development and safety. Shear-yielding toughening via rubber particles and micro-cracking/crazing/bridging toughening via thermoplastic particles are the two most important toughening methods used to improve material performance. A fundamental connection between these two mechanisms is the intrinsic stress state dependent deformation of polymers. Identification of the stress state near the reinforcing particles and characterizing the deformation of the matrix in this stress state are critical issues. These issues can only be resolved through experimental studies of the polymer deformations and quantitative analyses of the details of the toughening mechanisms. ***