微型注塑POM/MoS_2复合材料微观形貌和结晶行为研究  

Study on Micro-morphology and Crystallization Behaviors of Microinjection Molded POM/MoS_2 Composites

作　　者：杨森[1] 陈英红[1] 丁薇薇[1] 

机构地区：[1]四川大学高分子研究所高分子材料工程国家重点实验室,四川成都610065

出　　处：《塑料科技》2016年第4期27-31,共5页Plastics Science and Technology

基　　金：国家自然科学基金(51010004;51433006);高等学校学科创新引智计划(B13040)

摘　　要：制备了聚甲醛/二硫化钼(POM/Mo S_2)复合材料并对其进行微型注塑,考察了POM/Mo S_2微型制品的微观形貌,同时研究了注射条件对其取向和结晶行为的影响。扫描电子显微镜(SEM)和偏光显微镜(PLM)分析结果表明:POM/Mo S_2微型制品具有典型的皮芯结构,其中Mo S_2片状粒子在剪切层沿流动方向取向排列,而在芯层则呈无规排列。二维广角X射线衍射分析(2D-WAXD)和差示扫描量热分析(DSC)的结果表明:微型注塑的模具温度和注射速率对微型制品的取向和结晶行为都有较大的影响。随着模具温度的提升,相应微型注塑制品的取向程度呈下降趋势,但POM的熔点和结晶度提高;随着注射速率的提高,相应微型制品的取向程度及POM的结晶度均呈上升趋势,但POM的熔点变化不明显。The microinjection molding of the prepared polyoxymethylene/molybdenum disulfide（POM/MoS2） composite was conducted. Then the micro-morphology of the POM/MoS2 micropart and the influences of injection conditions on the corresponding orientation behavior and crystallization behavior were investigated. The images of polarized optical microscope（PLM） and scanning electronic microscope（SEM） showed that： the POM/MoS2 micropart possessed the typical skincore structure. In the shear layer, the orientated MoS2 flake particles were found to be aligned along the melt flow direction. However, in the core layer, the MoS2 flake particles showed irregular distribution. The differential scanning calorimeter（DSC） and two dimensional wide angle X-ray diffraction（2D-WAXD） results indicated that： the microinjection molding conditions including mold temperature and injection speed had obvious influences on the orientation behavior and crystallization behavior of microparts. With the increasing mold temperature, the corresponding orientation degree of micropart presented a descending trend, but the melting point and crystallinity of POM increased. With the increasing injection speed, the orientation degree of micropart and the crystallinity of POM showed an increasing tendency, but the melting point of POM did not change obviously.

关 键 词：聚甲醛 二硫化钼 微型注塑 微观形貌 结晶行为 

分 类 号：TQ326.51[化学工程—合成树脂塑料工业]