中国塑料 ›› 2024, Vol. 38 ›› Issue (12): 29-36.DOI: 10.19491/j.issn.1001-9278.2024.12.005

• 材料与性能 • 上一篇    下一篇

稀土β晶成核剂对聚丙烯结晶与发泡性能研究

刘亚宁1, 刘海明2, 刘劭1, 陈士宏1, 王向东1()   

  1. 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
  • 收稿日期:2024-09-26 出版日期:2024-12-26 发布日期:2024-12-25
  • 通讯作者: 王向东(1972-),男,教授,博士研究生导师,主要从事聚合物发泡材料的研究开发,wangxid@th.btbu.edu.cn
    E-mail:wangxid@th.btbu.edu.cn
  • 基金资助:
    国家自然科学基金(52273030)

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

LIU Yaning1, LIU Haiming2, LIU Shao1, CHEN Shihong1, WANG Xiangdong1()   

  1. 1.School of Light Industry Science and Engineering,Beijing Technology and Business University,Beijing 100048,China
    2.School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China
  • Received:2024-09-26 Online:2024-12-26 Published:2024-12-25
  • Contact: WANG Xiangdong E-mail:wangxid@th.btbu.edu.cn

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。

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

Abstract:

A variety of nucleating agents were introduced into long⁃chain branched polypropylene (LCBPP) to investigate the β⁃crystal nucleating effect of a nucleating agent WBG⁃Ⅱ in 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 samples were characterized by X⁃ray diffraction, differential scanning calorimetry, and rotational rheometer to identify the highly effective β⁃crystal inducer, WBG⁃Ⅱ. The results indicated that the addition of 5 phr WBG⁃Ⅱ resulted in an increase 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⁃Ⅱ effectively induced the β⁃crystal orientation in iPP. Incorporating iPP into the LCBPP matrix significantly increased the β⁃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.

Key words: long?chain branched polypropylene, isotactic polypropylene, β?phase nucleating agent, supercritical carbon dioxide, microcellular foam

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