PS-EG插层复合物制备及其改性聚苯乙烯的研究

通过化学氧化、高温处理将天然鳞片石墨制成膨胀石墨(EG),采用原位聚合法制备了聚苯乙烯-膨胀石墨(PS-EG)插层复合物,并将PS-EG复合物与PS进行熔融共混,研究了PS-EG复合物含量对PS结构及性能的影响。结果表明,PS-EG的加入,使得PS的冲击强度和热性能提高,而拉伸强度下降;当PS-EG含量为9%(质量分数,下同)时,PS的冲击强度提高了63.4%;EG在复合材料中呈蠕虫状分布;PS-EG复合物的存在增加了复合材料的界面效应,冲击断面呈现孔洞式结构。

Preparation of Polystyrene-expanded Graphite Intercalated Complex and Its Modification on Polystyrene

Expandable graphite was prepared from natural flake graphite via chemical oxidation and high temperature processing.Via in-situ polymerization of styrene in presence of expanded graphite polystyrene-expanded graphite(PS-EG) composites were obtained.Melt blending PS-EG with neat polystyrene leaded to polystyrene/polystyrene-expanded(PS/PS-EG) composites.The mechanical properties,thermal stability,and the microstructure of the composites were studied.The impact strength,and thermal stability were improved with the adding of PS-EG.Compared with the neat polystyrene,the impact strength of PS/PS-EG composites was improved 63.4 %,when the content of PS-EG was 9 %,however the tensile strength showed a large decreasing.Micro-analysis showed that expanded graphite dispersed homogeneously in the form of vermiculate in the composites,and the existence of PS-EG increased the interface effect of PS/PS-EG composite,the cross section of the composites displayed a pinhole structure.