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

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

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(NACA)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。

Combined effect of sodium 2,2＇-methylene-bis-（4,6-di-tert-butyphenyl）phosphate（NA-11）and sodium bicycle[2,2,1]-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 ofαphase iPP.The crystallization peak temperature increases by 20.3℃and the crystallinity increases by 8.8% when 0.4wt%1∶1combined 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.