无机粒子填充PP/POE共混物的制备及其性能研究

摘要

Layered kaolin,granular CaCO3 and rod-like attapulgite (ATP) were employed as inorganic fillers,and then the polypropylene (PP)/poly(ethylene-co-1-octene) (POE) compounds filled with the three inorganic particles were prepared by melt extrusion.The mechanical properties,processability and microstructures of the resultant compounds were investigated by universal testing machine,impact testing machine,melt flow rate measurer and scanning electron microscopy,respectively.The results indicated that the tensile strength of the compounds achieved the maximum value of 29.1 MPa when 2.5 wt ％ of ATP was incorporated,whereas their notched impact strength reached the maximum value of 14.0 kJ/m-2 at CaCO3 content of 2.5 wt ％.In addition,the processability of PP/POE/CaCO3 compounds was improved significantly,which was attributed to the spherical CaCO3 particles acting as "ball bearings" in the matrix.%采用层状高岭土(kaolin)、粒状碳酸钙(CaCO3)及棒状凹凸棒土(ATP)3种不同结构的无机粒子分别对聚丙烯/乙烯-辛烯共聚物(PP/POE)共混物进行填充改性制备PP/POE/无机粒子复合材料,并采用万能拉伸试验机、冲击试验机、熔体流动速率仪及扫描电子显微镜对所制备的复合材料进行力学性能、加工性能及微观形貌分析.结果表明,当ATP含量为2.5％(质量分数,下同)时,PP/POE/ATP复合材料的拉伸强度达最大值29.1 MPa;当CaCO3含量为2.5％时,PP/P(OE/CaCO3复合材料的缺口冲击强度达最大值14.0 kJ/m2;粒状CaCO3的“滚珠效应”使得PP/POE共混物的加工性能得以改善.