拉伸形变作用下UHMWPE／PP／OMMT纳米复合材料的制备与表征  

Preparation and Characterization of UHMWPE/PP/OMMT Composites Under Dynamic Elongation Flow

作　　者：张晓秋 谭永彬 李远豪 张桂珍[1] 

机构地区：[1]华南理工大学聚合物新型成型装备国家工程研究中心,华南理工大学聚合物成型加工工程教育部重点实验室,广东广州510640

出　　处：《塑料工业》2017年第11期38-42,46,共6页China Plastics Industry

基　　金：广州市一般科技研究专项(201607010240);国家重点研发计划项目(2016YFB0302301);国家自然科学基金资助项目(51505153);广东省自然科学基金博士启动基金项目(2016A030310429)

摘　　要：研究在拉伸流场作用下,有机化处理后的蒙脱土(OMMT)与超高分子量聚乙烯(UHMWPE)/聚丙烯(PP)在不同混炼时间下的分散效果。UHMWPE/PP/OMMT复合材料质量比固定为70/30/3,混炼时间分别为3、4、5、6、7 min。观察复合材料的微观结构、热学性能以及流变性能的变化。结果发现,在拉伸流场作用下,OMMT在3min后可初步均匀分布于基体之中。增加混炼时间,OMMT的分散效果只有小幅度的优化,但UHMWPE的结晶度有明显上升,而流变性能无明显变化。由于PP与OMMT的热稳定性不如UHMWPE,复合材料的热分解温度相比于纯UHMWPE降低。混炼时间过长时,材料出现了部分分解,导致结晶度和热稳定性的劣化。The microstructure and morphology of ultra-high molecular weight polyethylene （UHMWPE）/polypropylene （PP）/organ-montmorillonite （OMMT） composites under dynamic elongation flow tbr different mixing time were studied. The UHMWPE/PP/OMMT blend （mass ratios of 70/30/3 ） was prepared in a novel vane extruder for 3, 4, 5, 6 and 7 min, respectively. And the effect of various mixing time on thermal property and theology were investigated. The results show that OMMT sheets are dispersed uniformly in 3 min in the extension field. With the increase of mixing time, the dispersion effect of OMMT is optimized slightly in the composites. OMMT plays a role as heterogeneous nucleation agent in the composites, so that the crystallization of UHMWPE increases with mixing time at first then decreases due to the degradation of the materials. The composites show the optimum crystallization in 6 min. However, the result of dynamic rheological analysis shows that the flowability of UHMWPE/PP nearly keeps steady when the mixing time changes.

关 键 词：拉伸流场 超高分子量聚乙烯 聚丙烯 有机蒙脱土 混炼时间 

分 类 号：TB332[一般工业技术—材料科学与工程] TB383.1