PP纳米复合材料断面形貌分析及拉伸行为有限元模拟  

NUMERICAL SIMULATION OF TENSILE BEHAVIOR AND FRACTURE MORPHOLOGY ANALYSIS FOR PP NANOCOMPOSITES

作　　者：高明瑞[1,2] 伍玉娇[1,2] 陈雨玲[1,2] 谢高福[1] 李娟[1,2] 

机构地区：[1]贵州大学材料与冶金学院,贵阳550003 [2]国家复合改性聚合物材料工程技术研究中心,贵阳550014

出　　处：《工程塑料应用》2011年第2期62-65,共4页Engineering Plastics Application

基　　金：贵州省自然科学基金项目(黔科合J字[2010]2004);贵州大学研究生创新基金资助项目

摘　　要：采用熔融共混法制备了聚丙烯(PP)/纳米TiO2复合材料,利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)分析了复合材料的冲击和拉伸断裂行为,最后采用有限元法对复合材料的拉伸行为进行了数值模拟。结果表明,复合材料的冲击韧性较纯PP有很大程度的改善,但其拉伸断裂方式仍为脆性断裂。拉伸过程中,大的团聚体首先与基体PP相脱离,纳米粒子及其表面的柔性界面层作为一个整体与基体PP脱粘。当无机纳米粒子的质量分数较小(1%)时,单个粒子的微区应力场受其他粒子的影响不大,微区应力场重叠或交叉现象不明显;在不同载荷作用下,无机纳米粒子与PP相互作用区域应力增量最为明显,即当应力增大时,界面相首先发生破坏,无机纳米粒子与基体脱粘。Polypropylene（PP）/nano-TiO2 composites were prepared by the meh intercalation molding. The tensile and impact properties were studied based on the SEM and TEM micrographs, and then numerical simulation of tensile behaviors was carried out using a finite element method. Results showed that the toughing properties of PP were improved by the addition of nano-TiO2 and the mode of tensile fracture was brittleness. Aggregates of nano-particles would be debonding with polypropylene firstly during the tensile process, also the interface between matrix and particles along with the particles debonded with the matrix at the same time. If the volume fraction of particles was less, other particles had little influence on the local stress field of a certain particle, no obvious overlap or cross of the stress field could be found between two neighboring particles. While applying different loads, the stress jumps to maximum stress value in the interaction region of the two phase firstly, and then it occurred that the particles debonded with the matrix.

关 键 词：聚丙烯 纳米TIO2 断面形貌 拉伸行为 有限元分析 

分 类 号：TQ334.9[化学工程—橡胶工业]