文章摘要
石墨烯杂化体的制备及对聚丙烯的阻燃
Preparation of Graphene Hybrids and Their Flame Retardation on Polypropylene
  
DOI:10.16865/j.cnki.1000-7555.2018.04.023
中文关键词: 石墨烯  接枝  二氧化钛  复合材料  热性能  燃烧行为
英文关键词: graphene  grafted  titanium dioxide  composite  thermal performance  combustion behavior
基金项目:
作者单位
陶守亮1, 王继辉1, 倪爱清2, 陈宏达1, 邓志康3 1. 武汉理工大学 材料科学与工程学院 2. 复合材料新技术国家重点实验室 3. 武汉理工大学 理学院湖北 武汉 430070 
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中文摘要:
      采用Hummers法制备氧化石墨烯(GO)水溶液,利用钛酸四丁酯在此溶液中的水解反应制备石墨烯接枝二氧化钛(RGO-TiO2)纳米杂化体;通过熔融共混法制备石墨烯接枝二氧化钛改性聚丙烯复合材料(RGO-TiO2/PP),并对其热性能和燃烧行为展开研究。利用红外光谱、X射线衍射、激光拉曼光谱和扫描电镜对RGO-TiO2杂化体及复合材料的微观结构进行了表征分析;利用热重分析、极限氧指数(LOI)、垂直燃烧法、锥形量热等方法研究了复合材料的热性能和燃烧行为;利用万能试验机和冲击试验机,研究复合材料的力学性能。结果表明,在复合体系中RGO-TiO2分散性优于石墨烯片(RGO);RGO-TiO2可显著提高复合材料热稳定性,LOI从17.0%增加到21.4%,熔滴滴落速率和生烟量明显减少,热释放速率(HRR)和热释放速率峰值(PHRR)分别下降10%和43.8%;弯曲强度和冲击强度均先增加后降低。
英文摘要:
      Graphene was prepared by Hummers method. The surface of graphene was grafted with titanium dioxide to obtain graphene grafted TiO2 (RGO-TiO2) nanocomposites. The RGO-TiO2/PP composite was prepared by melt-mixing polypropylene (PP) with the hybrid. FT-IR, XRD, Raman and SEM were used to characterize the microstructure of composites. Thermogravimetric analysis (TGA), limiting oxygen index (LOI), vertical combustion method and cone calorimeter were used to study the thermal performance and combustion behavior of the composites. The results show that RGO-TiO2 is more dispersible than GNS in the composite system. The mechanical properties of the composites were studied by universal testing machine and impact testing machine. A small amount of RGO-TiO2 can improve the thermal stability of the composites, increase the LOI by 20.6%, decrease the fusion dripping rate and the amount of smoke in the vertical combustion. The heat release rate (HRR) and the peak heat release rate (PHRR) decrease by 10% and 43.8%, respectively, and with the increase of the RGO-TiO2 content, the flame retardancy of the composites is improved. Bending strength and impact strength are increased and then decreased.
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