一种高效酰胺类透明成核剂对聚丙烯性能的影响  

Effect of a high-efficiency amide transparent nucleating agent on properties of polypropylene

作　　者：袁嘉晨 黎剑浩 于超 赵世成 YUAN Jiachen;LI Jianhao;YU Chao;ZHAO Shicheng(Shanghai Key Laboratory of Multiphase Materials Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;CNOOC Institute of Chemical&Advanced Materials,Beijing 102200,China)

机构地区：[1]华东理工大学化工学院,上海市多相结构材料化学工程重点实验室,上海200237 [2]中海油化工与新材料科学研究院,北京102200

出　　处：《工程塑料应用》2024年第5期159-165,共7页Engineering Plastics Application

基　　金：国家自然科学基金项目(21878089)。

摘　　要：研究了一种新型酰胺类成核剂,1,3,5-苯三甲酸三(新戊胺),对等规聚丙烯(iPP)性能的影响。首先,对iPP光学和力学性能进行表征。结果表明,该成核剂在较低的浓度下就展现了较高的成核效果,当添加量为0.3‰(质量分数,下同)时,iPP雾度降低了60.2%,弯曲弹性模量和拉伸强度分别提高了19.7%和13.7%,这说明该成核剂是一种高效的iPP透明成核剂。其次,应用偏光显微镜和差示扫描量热仪分别对iPP晶体形貌和结晶行为进行了表征。结果表明,纯iPP在30 min还未完成结晶过程,结晶速率较慢。加入成核剂后,成核iPP在4 min左右就基本完成了结晶过程,结晶速率大大提高,同时球晶尺寸明显减小。另外,成核剂使iPP结晶温度从121.1℃提高至130.0℃,熔融温度从164.1℃提高至165.8℃。这进一步说明了该成核剂的高效。最后,对纯iPP和成核iPP的等温结晶动力学进行研究,结果表明,该成核剂降低了iPP的Avrami指数n,说明其能够促进iPP的异相成核,从而加快结晶速率。The effect of a novel amide nucleating agent,1,3,5-benzene tricarboxylic acid tris(neopentylamine),on the properties of isotactic polypropylene(iPP)was investigated.The optical and mechanical properties of iPP were characterized.The results show that the nucleating agent exhibits a high nucleation effect at a low concentration.When the addition amount is 0.3‰,iPP haze is reduced by 60.2%.At the same time,the flexural modulus and tensile strength are increased by 19.7%and 13.7%.This indicates that the nucleating agent is a highly efficient transparent nucleating agent for PP.Differential scanning calorimetry and polarizing optical microscopy were respectively applied to characterize the crystalline behavior and crystal morphology of iPP.The results show that the crystallization process of pure iPP can not complete within 30 minutes and the crystallization rate is slow.After adding the nucleating agent,the crystallization process of nucleated iPP can basically complete in about 4 minutes.The crystallization rate is greatly improved,while the size of the spherical crystals is significantly reduced.In addition,the nucleating agent increases the crystallization temperature of iPP from 121.1℃to 130.0℃and the melting temperature from 164.1℃to 165.8℃.Finally,the isothermal crystallization kinetics of iPP were investigated.It is suggested that the nucleating agent can reduce the Avrami index n of iPP and can promote heterogeneous nucleation of iPP,thus accelerating the crystallization rate.

关 键 词：等规聚丙烯 酰胺类成核剂 光学性能 等温结晶动力学 结晶性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]