光学级聚碳酸酯冲击断面典型形貌及形成机理  

Impact fracture morphology and its formation mechanism for optical-grade polycarbonate

作　　者：冯跃战[1] 王波[1] 郑海丽[1] 陆波[1] 王志新[1] 郑国强[1] 刘春太[1] 

机构地区：[1]郑州大学材料科学与工程学院,橡塑模具国家工程研究中心,河南省郑州市450001

出　　处：《合成树脂及塑料》2013年第5期71-75,共5页China Synthetic Resin and Plastics

基　　金：国家自然科学基金资助项

摘　　要：研究了退火处理后光学级聚碳酸酯(PC)的冲击断面形貌,重点分析了周期条纹和带状形貌的形成机理。经退火处理的PC冲击断面形貌主要由断裂源区、雾区和末端带状区组成。基于断面形貌分析,认为雾区内周期条纹的形成是应力波改变了银纹及其附近基体的应力场,从而导致裂纹路径发生改变的结果。周期条纹中银纹带和无特征区宽度的变化则是裂纹扩展时所在银纹层厚度减小的结果。末端带状区内带状形貌的形成机理是一个裂纹扩展的间歇过程,即"黏-滑"过程。The authors studied the morphology of impact fracture surface of annealed optical-grade poly- carbonate （PC）, with an emphasis on the formation mechanism of cycle stripes and band morphology. The mor- phology of impact fracture surface of annealed PC could be divided into fracture original region, mist region and end-wall band region. Based on the analysis of the fracture surface morphology, it is considered that the forma- tion of cycle stripes in the mist region is the result that the stress fields of the craze and matrix near the craze are changed by stress waves, leading to the change of crack paths. The decrease of the thickness of the craze layer during crack propagation results in the change of the craze band and the nondescript region＇ s width in cycle stripes. The formation mechanism of the band morphology in the end-wall band region is a batch process of crack propagation, i.e. a stick-slip ＂process.

关 键 词：聚碳酸酯 冲击断面 周期条纹 带状形貌 应力波 

分 类 号：TQ323.41[化学工程—合成树脂塑料工业]