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摘要研究了石墨烯、β成核剂NB328分别加入聚丙烯(PP)中及二者复合加入对PP结晶行为与力学性能的影响。用正交偏光显微镜、X射线衍射、DSC等方法对PP结晶形貌和力学性能进行了分析。研究结果表明，石墨烯是一种聚丙烯α晶型成核剂，可使α球晶尺寸减小，结晶温度升高。当石墨烯的含量为0.010wt%时，PP结晶性能最好，结晶度最大同时温度提高约3℃；聚丙烯力学性能此时亦为最优，拉伸强度提高了14%。NB328可诱导聚丙烯形成β晶相同时球晶尺寸减小，结晶峰温度提高。NB328最佳含量为0.100wt%，此时体系中β晶相含量(Kβ)达72.50%,此时力学性能最优。用正交实验法研究石墨烯/NB328复合成核剂在聚丙烯中的作用情况。结果表明，复合成核剂中β成核剂的含量是影响体系力学性能和结晶行为的主要因素。复合成核剂的最佳配比为石墨烯含量0.010wt%，NB328 0.200wt%，此时聚丙烯结晶性良好，力学性能最优。42540
关键词 石墨烯 β成核剂 聚丙烯 结晶行为
毕业论文设计说明书外文摘要
Title The Influence of Nucleating Agent on The Crystallization Behavior of Polypropylene (PP)
Abstract
The influence of the β-nucleating agent and graphene on the crystallization and properties of PP were studied respectively. The mechanical properties，strueture charaeteristies of different PP system and the β-phase content of β-nucleated PP were determined by Differential Scanning Calorimeter(DSC)，polarized optical microscope(POM)and X-ray Diffraction(XRD). The results indicated that the crystallization temperature(Tc) of graphene/PP system was increased while the spherulite size obviously decreased compared with that of net PP. So did the β-nucleated PP. The best content of graphene was 0.010wt%. The content of β-phase (K βvalue) can reach as high as 72.50% with only 0.100wt% of NB328 addition. By orthogonal experimental method , to add β-nucleating agent and graphene a different proportion of polypropylene at the same time，The results showed that the concentration of β-nucleating agent was the main factor of mechanical properties and crystallization behavior. The optimum concentration of additive was β-nucleating agent 0.010wt% and graphene 0.200wt%,while the mechanical properties and strueture charaeteristies were optimal。
Keywords Graphene β-nucleating agent Polypropylene Crystallization behavior
目 次
1 绪论 1
1.1 课题的研究背景 1
1.2 聚丙烯成核剂种类 1
1.3 聚丙烯成核机理 3
1.4 聚丙烯成核剂改性新材料的应用 4
1.5 本课题主要研究内容 4
2 实验 1
2.1 实验试剂 1
2.2 仪器设备 1
2.3 样品制备 2
2.3 测试与表征 3
3 结果与讨论 1
3.1 石墨烯对PP结晶行为与性能的影响 1
3.2 NB328对PP结晶行为与性能的影响 5
3.3 复合成核剂石墨烯/NB328对PP结晶行为与性能的影响 10
结 论 17
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