摘要
通过双螺杆挤出机熔融共混制备了聚丙烯(PP)/凹凸棒土(ATP)复合材料样品,分别采用偏光显微镜和差示扫描量热仪对其结晶行为进行了研究。研究表明,复合材料样品的偏光显微镜照片呈现球晶所特有的十字消光现象,球晶尺寸与纯PP球晶的尺寸相比有所减小。非等温结晶测试结果表明,复合材料样品的结晶温度随着ATP含量的增加向高温方向移动,而且半结晶期缩短,PP/ATP复合材料的总体结晶速率增加;ATP的加入改变了PP成核的机制,起到了异相成核的作用。随着降温速率的增大,PP及PP/ATP(95/5)复合材料的结晶起始温度和结晶峰值温度均向低温方向移动,半结晶期变短。
Polypropylene （PP）/attapulgite （ATP）composites were prepared in the melt blending method through twin screw extruder, and their crystallization behaviors were respectively studied by polarized light microscope and differential scanning calorimetry. The results showed that the polarized light photo of the composite assumed cross extinct appearance characteristic of spherulites, and the dimensions of the spberulites of PP/ATP composites were smaller than those of PP. The results of non-isothermal crystalline behavior of PP/ATP composites indicated that the crystallization temperature of the composites assumed an gradually increased, the half crystallization time shortened, and the total crystallization rate of PP/ATP composites increased as ATP content increased. The addition of ATP changed the mechanism of nucleation, and acted as heterogeneous nucleating agent. To and I~, of PP and PP/ATP composites shifted to lower temperature, and t0.5 shortened as the cooling rate increased.
出处
《合成纤维》
CAS
2011年第9期19-22,共4页
Synthetic Fiber in China
关键词
聚丙烯
凹凸棒土
复合材料
结晶
polypropylene
attapulgite
composite
crystallization
