稀土β晶成核剂对聚丙烯结晶与发泡性能研究  

Effect of rare earthβ⁃nucleating agent on crystallization and foaming properties of polypropylene

作　　者：刘亚宁 刘海明 刘劭 陈士宏[1] 王向东[1] LIU Yaning;LIU Haiming;LIU Shao;CHEN Shihong;WANG Xiangdong(School of Light Industry Science and Engineering,Beijing Technology and Business University,Beijing 100048,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]北京工商大学轻工科学与工程学院,北京100048 [2]郑州大学材料科学与工程学院,郑州450001

出　　处：《中国塑料》2024年第12期29-36,共8页China Plastics

基　　金：国家自然科学基金(52273030)。

摘　　要：为探讨成核剂WBG-Ⅱ在长链支化聚丙烯(LCBPP)/等规聚丙烯(iPP)共混物中的β晶诱导效果及其对PP材料力学性能和泡沫结构的影响,通过在LCBPP中引入不同成核剂,利用X射线衍射、差示扫描量热仪和旋转流变仪对样品进行表征,筛选出高效诱导β晶的成核剂WBG-Ⅱ。结果表明,当加入5份(质量份,下同) WBG-Ⅱ时,LCBPP的冲击强度提升了128%,而拉伸强度下降幅度控制在20%以内;同时,成核剂的加入对LCBPP的熔体强度无显著负面影响。利用差示扫描量热议进一步观察发现,成核剂WBG-Ⅱ对iPP具有强效的诱导β晶取向作用;在LCBPP基体中掺入iPP显著提高了混合物中β晶的结晶度;与纯LCBPP相比,LCBPP/iPP配比1∶1的样品结晶度提高了190%;此外,加入iPP还增强了PP混合物在高频下的储能模量和复数黏度。A variety of nucleating agents were introduced into long-chain branched polypropylene(LCBPP)to investigate theβ-crystal nucleating effect of a nucleating agent WBG-Ⅱin the LCBPP/isotactic polypropylene(iPP)blends as well as to evaluate their impact on the mechanical properties and foam structure of formed PP materials.The as-prepared sam-ples were characterized by X-ray diffraction,differential scanning calorimetry,and rotational rheometer to identify the highly effectiveβ-crystal inducer,WBG-Ⅱ.The results indicated that the addition of 5 phr WBG-Ⅱresulted in an in-crease in the impact strength of LCBPP by 128%,whereas its tensile strength decreased by above 20%.Additionally,the nucleating agent had no significant adverse effect on the melt strength of LCBPP.Polarized optical microscopy(POM)observations further revealed that WBG-Ⅱeffectively induced theβ-crystal orientation in iPP.Incorporating iPP into the LCBPP matrix significantly increased theβ-crystal content in the blend.Compared to pure LCBPP,there was an increase in the crystallinity degree by 190%for the LCBPP/iPP sample at a mas ratio of 1/1.Furthermore,the addition of iPP enhanced the storage modulus and complex viscosity of the PP blend under high-frequency conditions.

关 键 词：长支链支化聚丙烯 等规聚丙烯 β晶成核剂 超临界二氧化碳 微孔泡沫 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]