化工学报Issue(5)：1931-1938,8.DOI:10.11949/j.issn.0438-1157.20141661
剪切历史对微注塑制品形态结构和力学性能的影响
Influence of shear history on morphology, microstructure and mechanical properties of micro injection molded parts
摘要
Abstract
Micro injection molding experiments were conducted to investigate the influence of shear history on morphology, microstructure and mechanical properties of the micro-scale parts by changing injection speed based on the iPP parts with thickness of 0.2, 0.5 and 1 mm. Shear rate was analyzed with software Moldflow. Skin-core structure appeared in the thickness direction in both 0.5 mm and 1 mm parts, and imperfect shish-kebab structure appeared in the transition layer between skin layer and core layer of 0.5 mm and 1 mm parts, however, column crystal was shown in the transition layer of 0.2 mm parts. The whole shear level in shear history increased with increasing injection speed for all the parts with three thicknesses. The ratio of skin layer of 0.5 mm and 1 mm parts decreased with increasing injection speed, and yield stress, elongation at break, breaking strength and modulus decreased as the ratio of skin layer decreased. For 0.2 mm parts, the ratio of skin layer increased with increasing injection speed, and yield stress, breaking strength, modulus increased with increasing ratio of skin layer, while elongation at break decreased.关键词
微注塑成型/微尺度/等规聚丙烯/剪切历史/结晶/形态/显微结构/力学性能Key words
micro-injection molding/microscale/isotactic polypropylene/shear history/crystallization/morphology/microstructure/mechanical properties分类
化学化工引用本文复制引用
王佳佳,王利霞,卞宁,王东方,王永贞,张杨,李倩,申长雨..剪切历史对微注塑制品形态结构和力学性能的影响[J].化工学报,2015,(5):1931-1938,8.基金项目
国家自然科学基金项目（11372287）；高等学校博士学科点专项科研基金项目(20124101110007)。@@@@supported by the National Natural Science Foundation of China (11372287), the Specialized Research Fund for the Doctoral Program of High Education of China(20124101110007) （20124101110007）
