β成核剂对聚丙烯结构与性能的影响  

Influence ofβ-nucleating agent on structure and properties of polypropylene

作　　者：辛华[1] 任庆海[1] 段拓 白娟娟[1] 

机构地区：[1]陕西科技大学化学与化工学院,陕西西安710021 [2]西安中材型材有限公司,陕西西安710075

出　　处：《陕西科技大学学报（自然科学版）》2014年第6期96-99,共4页Journal of Shaanxi University of Science & Technology

基　　金：陕西省科技厅自然科学基金项目(2012JM6011);陕西科技大学博士科研启动基金项目(BJ12-27)

摘　　要：以苯甲酸钠作为聚丙烯(PP)的β晶型成核剂,采用熔融共混法制备出β晶改性PP.同时,采用冲击、拉伸、XRD、PLM及SEM等方法,对改性PP的力学性能、结晶行为及微观结构等进行了研究.结果表明,当成核剂用量为0.4%时,改性PP的冲击强度可达到66.2J/m2,总结晶度达到76.9%.苯甲酸钠的加入,诱导PP中部分α晶型向β晶型发生转变,改性PP的晶核密度增大,球晶尺寸细化.改性后PP由脆性断裂转变为韧性断裂.Polypropylene（PP） modified by crystal nucleating agent （sodium benzoate） was prepared by melt blending .T he mechanical properties ,crystallization behavior and microstructure of the modified PP were studied by the tests of impact strength ,tensile strength , XRD ,PLM and SEM .The results showed that the impact strength of modified PP was 66 .2 J/m^2 and the degree of crystallization was 76 .9% when adding 0 .4% sodium benzoate .The addition of sodium benzoate inducedαcrystal of PP into βcrystal .Compared with unmodified PP ,the sodium benzoate caused spherulite size of PP diminishing ,the quantity increasing ,and the fracture mechanism shifting from brittle fracture to ductile fracture .

关 键 词：聚丙烯 Β成核剂 结晶 韧性断裂 

分 类 号：TQ314.24[化学工程—高聚物工业]