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