聚丙烯/液晶/马来酸酐接枝聚丙烯复合材料的结构性能

Structure Properties of PP/LCP/PP-g-MAH Composites Prepared by Melt Blending

选用液晶聚合物(LCP)对聚丙烯(PP)进行熔融共混,采用马来酸酐接枝聚丙烯(PP-g-MAH)对PP/LCP复合材料进行改性,采用热分析(DSC)和电子扫描电镜(SEM)对复合材料结构与性能进行研究。研究发现:添加少量液晶对PP具有一定的增强和增韧作用,与纯PP相比,PP/LCP(100/10)拉伸强度和冲击强度分别提高了5.4%和21.3%;在PP-g-MAH接枝改性后,PP/LCP/PP-g-MAH(100/10/3)比PP/LCP(100/10)拉伸强度提高了18.5%,冲击强度提高了33.2%。增加LCP含量,提高了PP/LCP共混物中PP组分熔融温度,但是结晶度降低;加入少量的PP-g-MAH,提高了PP/LCP/PP-g-MAH共混物耐热温度和PP组分结晶度。SEM照片显示,加入液晶组分,有利于PP/LCP共混物形成取向结构;加入PP-g-MAH,有利于LCP形成取向微纤,改善制品的综合性能。

A commercial liquid crystalline polymer（LCP） was used to blend with polypropylene（PP）,and a PP-g-MAH was used to improve the compatibilization of PP and LCP.The structure-properties of PP/LCP and PP/LCP/PP-g-MAH composites were studied with DSC and SEM.The results showed that the addition of a little LCP is beneficial for strengthening and reinforcing PP/LCP blends.Compared with pure PP,the impact strength and tensile strength of PP/LCP（100/10） is increased by 21.3% and 5.4%,respectively.With the addition of LCP,the melt temperature of PP component is increased while its crystallinity decreased.Compared with PP/LCP（100/10） blend,the addition of PP-g-MAH,increases the tensile strength and impact strength of PP/LCP/PP-g-MAH（100/10/3） blend.SEM photos showed that,with the addition of LCP component the preferred orientation structure is formed for PP/LCP blends,and the preferred orientation of LCP microfiber is formed with the addition of PP-g-MAH,which are beneficial for enhancing article＇s over-all properties.