有机磷酸酯盐与羧酸盐复配成核剂对等规聚丙烯性能的影响

以2，2'-亚甲基-双-（4，6-二叔丁基苯基）磷酸钠 （NA-11）和双环2，2，1]-庚烷-2，3-二羧酸钠 （NA-CA）2种成核剂进行复配，研究复配成核剂对等规聚丙烯（iPP）力学性能和结晶行为的影响。采用双螺杆挤出机为共混设备将成核剂与iPP共混，制备了NA-11/NA-CA/iPP复合材料。通过万能材料实验机、XRD、DSC、偏光显微镜（PLM）对其力学性能、结晶形态、微观结构进行了表征。结果表明:NA-11和NA-CA 2种成核剂复配能够显著提高iPP的拉伸性能和弯曲性能。NA-11和NA-CA复配成核剂诱导iPP形成α晶体。2种成核剂1∶1复配，添加量为0.4wt%时，iPP的结晶峰温度提高了20.3 ℃，结晶度提高了8.8%。PLM显示，NA-11和NA-CA复配成核剂使iPP球晶尺寸明显变小。NA-11和NA-CA复配成核剂具有很好的成核效果，这2种成核剂对改善聚丙烯的结晶性能和力学性能具有协同效应。 

Effects of organic phosphate salt and carboxylic acid salt combined nucleating agent on properties of isotactic polypropylene

Combined effect of sodium 2,2'-methylene-bis-(4, 6-di-tert-butyphenyl) phosphate (NA-11) and sodium bicycle2, 2, 1]-heptane-2, 3-dicarboxylate (NA-CA) on mechanical properties and crystallization behaviors of isotactic polypropylene (iPP) were investigated. The nucleating agents and iPP were blended using a twin-screw extruder to prepare NA-11/NA-CA/iPP composites. The mechanical properties, crystallization behaviors and microstructure were characterized by universal material testing machine, XRD, DSC and polarized optical microscopy (PLM). The results show that NA-11 and NA-CA nucleating agents combined can improve the tensile properties and the flexural properties of iPP. The combined nucleating agent induces the formation of α phase iPP. The crystallization peak temperature increases by 20.3 ℃ and the crystallinity increases by 8.8% when 0.4wt% 1:1 combined nucleating agents are added into iPP. PLM show that the combined nucleating agents make the spherulite size of iPP decrease obviously. NA-11 and NA-CA combined nucleating agents show good nucleating efficiency and two nucleating agents show synergistic effects on improving crystallization behaviors and mechanical properties of iPP.