Material property design of polymer alloy using particle dispersed phase

众所周知，环氧树脂和PMMA是脆性材料。但是，橡胶改性聚合物合金通过加入橡胶颗粒而得到更高的增韧。高韧性的机理在研究中还不清楚。橡胶改性环氧树脂在低温下发生蠕变变形。了解裂纹尖端附近的损伤、蠕变和蠕变断裂行为对橡胶改性聚合物合金的使用具有重要意义。本研究采用有限元法和实验方法对橡胶改性环氧树脂和PMMA材料的性能进行了评价。本研究对CT标本进行了骨折试验。材料具有弹性、塑性和蠕变特性。在裂纹尖端附近观察到橡胶颗粒的蠕变损伤区和蠕变损伤。根据试验得到的蠕变曲线，建立了考虑蠕变损伤的蠕变近似方程。线性、非线性、蠕变和损伤的结果可作为橡胶改性聚合物合金设计的依据。

It is well-known that the epoxy resin and PMMA are brittle materials. But, a rubber modified polymer alloy is toughened higher by including rubber particles. The mechanism of higher toughness has been not known in the studies. And the rubber modified epoxy is deformed by creep at lower temperature. It is important to understand the damage near the crack-tip, the creep and the creep fracture behavior in order to use the rubber modified polymer alloy.In this study, The material behaviors are the rubber modified epoxy and PMMA are evaluated by the finite element method and experiments. The fracture tests of CT specimen and performed in this study. The material behaviors are elastic, plastic and creep one. The creep damage zone and the creep damage of the rubber particle near the crack-tip is observed in the experiments. The creep approximate equation taking account of creep damage is created using the creep curve obtained from the experiment. The result of the linear, nonlinear, creep, and damage can be based in the design of the rubber modified polymer alloy.