ABS对β-iPP晶成长及其复合材料的力学性能

Study of acrylonitrile-butadiene-styrene as β-nucleating agent for isotactic polypropylene and its mechanical properties

采用熔融挤出法制备了一系列不同ABS含量的ABS/iPP复合材料。研究了该复合材料的结晶性能和力学性能。广角X射线衍射扫描结果表明,ABS诱导iPP在β(300)面结晶,在ABS含量为5%(质量分数)时,复合材料β晶的相对含量为0.45;DSC结果表明,ABS的加入能提高复合材料的结晶温度和结晶速率;偏光显微镜观察结果表明,在iPP中加入ABS后,iPP在ABS表面附着生成β球晶。ABS的加入能在一定程度上提高iPP的机械性能,在ABS含量为5%(质量分数)时,复合材料的抗冲击强度提高了16%,热变形温度提高了5℃。综上所述,ABS可以作为iPP的大分子β成核剂,促进β-iPP晶的成长。

ABS/iPP composites were prepared by extrusion processing and its crystallization,mechanical proper-ties were studied.The result of WAXD showed that β-modification was induced with the help of ABS alongβ(300)lattice pland,and α-modification was restrained.When the content of ABS was 5wt%,the relative con-tent ofβ-crystal in iPP was 0.45,and the crystallinity was 66.94%.The results also showed that the relative content ofβ-crystal was hard to increase continually,because the crystalline rate was too fast for iPP chain seg-ment to adjust its chirality to formβ-crystal.It was found from DSC that the crystalline temperature and rate of iPP was increased with the adding of ABS,and the melting peak ofβ-crystal was appeared in the melting curve of ABS/iPP composites.It was observed in POM figures thatβ-crystal of iPP chain segment was crystallized be-long ABS chain segment.In addition,the mechanical properties and heat distortion temperature were increased. In conclusion,ABS can be used as polymericβ-nucleating agent for inducing iPP intoβ-modification and impro-ving the properties of iPP.