α/β复合成核剂协同增强煤基均聚聚丙烯力学性能
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国家能源集团宁夏煤业有限责任公司煤炭化学工业技术研究院,宁夏 银川 750411

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国家能源集团宁夏煤业有限责任公司科技创新项目(NXMY-20-32)


Synergistic Improving of Mechanical Properties of Coal-Based Homo Polypropylene by  Hybrid Nucleating Agent
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    摘要:

    针对煤基均聚聚丙烯结晶过程中?晶型成核生长能力较弱、冲击强度较低的问题,利用差示扫描量热仪(DSC)、广角X射线衍射(WAXD)和万能材料实验机研究了单独添加?、?和复合添加?/?成核剂对煤基均聚聚丙烯的结晶性能和力学性能的影响。研究表明,单独添加?或?成核剂均会存在一定的性能缺陷。DSC测试结果表明,?/?复合成核剂中?成核剂的存在会抑制?晶型的生成,?晶熔融峰强度会增加,在降温结晶曲线中也呈现出明显的?晶优先成核现象。与此同时,XRD结果表明,复合成核剂可以提高聚丙烯的?晶体的相对含量(Kβ)。?/?复合成核剂的加入有助于同时实现煤基均聚聚丙烯的刚韧平衡, 当复合成核剂添加量为0.15wt%,?/?质量比为1:2时,PP的拉伸强度提高了15.9%,断裂伸长率提高了305.3%,冲击强度提高72.5%。

    Abstract:

    In order to solve the problems of weak ? nucleation and crystal growth in the crystallization process of coal-based homo polypropylene (PP) and its resultant low impact strength, the effects of adding ? or ? nucleating agent and ?/? hybrid nucleating agent on the crystallization and mechanical properties of coal-based homo PP were studied by differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and universal material tester. The results show that adding?? or ? nucleating agents will lead to certain performance defects. DSC test results show that the presence of ? nucleating agent in ?/?? hybrid nucleating agent will inhibit the generation of ? crystal type, the intensity of ? crystal melt peak will increase, and the preferential nucleation of ? crystal is also obvious in the cooling crystallization curve. Meanwhile, XRD results showed that the hybrid nucleating agent could increase the relative content of ?-crystal (K?) of coal-based homo polypropylene. The addition of ?/?? hybrid nucleating agent helped to achieve the stiffness and toughness balance of coal-based homo polypropylene at the same time. When the hybrid nucleation agent addition was 0.15 wt% (?/? ratio is 1:2), the tensile strength of coal-based homo PP increased by 15.9 %, elongation at break increased by 305.3 % and impact strength increased by 72.5 %.

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  • 收稿日期:2022-02-21
  • 最后修改日期:2022-08-03
  • 录用日期:2022-08-05
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