核-壳结构ACR增韧改性PCTFE的性能与结晶行为

摘要

Polychlorotrifluoroethylene(PCTFE)was toughed with core-shell acrylate copolymer(ACR)as the toughening modifier. The effects of the content of ACR on the mechanical properties, microstructure, processing flow behavior and crystallization behavior of PCTFE/ACR blends were studied by universal testing machine, torque rheometer, scanning electron microscope(SEM), differential scanning calorimeter(DSC), polarized light microscope(PLM), etc. The results indicate that ACR can improve the impact strength of PCTFE, and the blends show ductile fracture characteristics when the amount of ACR is more than 6 phr. The plasticizing time of PCTFE/ACR blends is gradually shortened and the performance of processing flow of PCTFE/ACR blends is improved with the increase in the amount of ACR. ACR does not change the crystal morphology of PCTFE which is still rod form, while the crystal size is reduced and the crystallinity is decreased.%以核-壳结构丙烯酸酯共聚物（ACR）为改性剂对聚三氟氯乙烯（PCTFE）进行增韧改性，采用万能试验机、转矩流变仪、扫描电子显微镜、差示扫描量热仪及偏光显微镜等研究了ACR用量对PCTFE/ACR共混物力学性能、微观结构、加工流变行为及结晶行为的影响。结果表明：ACR可有效提高PCTFE的冲击强度，当ACR用量大于6 phr时，PCTFE/ACR共混物呈现韧性断裂特征；随着ACR用量的增加，PCTFE/ACR共混物的塑化时间逐渐缩短，加工流变性能得到改善；ACR的加入并未改变PCTFE晶体的棒状形态，但晶体尺寸减小，结晶度有所降低。