功能化纳米石墨烯片/PP-PP-g-MAH复合材料的制备与表征
Preparation and characterization of functionalized nano-graphene sheet/PP-PP-g-MAH composites

采用溶液共混法制备了乙二胺功能化石墨烯片/聚丙烯-马来酸酐接枝聚丙烯(GS-EDA/PP-PP-g-MAH)复合材料。利用FTIR、XRD、DSC、SEM和拉伸等表征手段对氧化石墨(GO)、GS-EDA及复合材料的结构和性能进行表征。研究结果表明: 乙二胺(EDA)成功接枝到石墨烯片(GS)的表面上;在共混过程中, GS-EDA与PP-g-MAH之间产生了强烈的氢键作用, 使GS-EDA均匀分散于基体中。DSC测试表明: GS-EDA的加入使GS-EDA/PP-PP-g-MAH复合材料的结晶峰向高温方向移动。随着GS-EDA加入量的增大, GS-EDA/PP-PP-g-MAH复合材料的拉伸强度呈先升后降的趋势。当加入质量分数为0.5%的GS-EDA时, 复合材料的拉伸强度达到最大, 较纯PP-PP-g-MAH的增加了24.7%, 较PP的增加了17.5%。SEM观察表明: 加入少量的GS-EDA时, GS-EDA能均匀分散于基体中, 但加入过多的GS-EDA将引起团聚。 Ethylenediamine functionalized graphene sheet/polypropylene-maleic anhydride grafted polypropylene (GS-EDA/PP-PP-g-MAH) composites were prepared by using solution compounding method. The structure and properties of graphite oxide (GO), GS-EDA and the composites were characterized by using FTIR, XRD, DSC, SEM and tensile test. The results indicate that the ethylenediamine (EDA) has been successfully grafted onto the surface of graphene sheet (GS), and hydrogen bond interactions which help GS-EDA disperse well in matrix happens between GS-EDA and PP-g-MAH during the compounding. DSC test shows that the crystallization peaks of GS-EDA/PP-PP-g-MAH composites move to higher temperatures due to the incorporation of GS-EDA.Tensile strength of GS-EDA/PP-PP-g-MAH composites increases and then decreases with increasing GS-EDA contents. With 0.5wt% mass fraction of GS-EDA, the tensile strength of composites approaches the ultimate value. Comparing to pure PP-PP-g-MAH and PP, the tensile strength increases by 24.7% and 17.5%, respectively. SEM observations show that GS-EDA disperses uniformly in matrix at low content but aggregates at higher incorporation. 教育部春晖合作计划基金(Z2010097); 四川省教育厅青年基金(11ZB005); 西华大学特种材料与制备技术重点实验室开放研究基金(SZjj2012-020)。