【摘要】 聚合物/黏土纳米复合材料是近几年聚合物材料改性的热点。为了进一步理解复合材料性能与结构的关系,利用自行研制的动态保压装置,借助WAXD、DSC、SEM等测试方法,研究了高密度聚乙烯(HDPE)/纳米有机蒙脱土(nano-OMMT)复合材料的结构与性能。结果表明,动态保压使OMMT纳米粒子在基体中的分散性提高,并形成插层结构。与此同时,动态剪切力场使HDPE/nano-OMMT复合材料的HDPE基体结构形态亦发生变化,试样中生成串晶结构,相比常规注塑试样,动态保压试样结晶度最大提高15%,结晶形态的变化和结晶度的提高均有利于HDPE/nano-OMMT复合材料强度的提高。力学性能试验显示,拉伸强度和冲击强度同时得到提高,HDPE/nano-OMMT复合试样的拉伸强度最大提高了119%,冲击强度最大提高430%。更多还原

【Abstract】 Polymer/clay nano-composites were extensively explored in recent years.For better understanding the relationship between structure and property of polymer material,in this paper,structure and property of HDPE/nano-OMMT composites were discussed prepared by a self-made dynamic packing injection molding(DPIM)device by WAXD,DSC and SEM.Results showed that the dispersion of nano-OMMT was exclusively improved and formed intercalated structure.On the other hand,The formation of shish-kebab was also detected in dynamic HDPE/nano-OMMT composites.Compared with conventional injection molding,the crystallinity of dynamic packing HDPE/nano-OMMT was increased by 15%,which was facilitated to improve the strength of HDPE/nano-OMMT composites.Mechanical test demonstrated both tensile strength and impact strength enhanced.In addition,the maximum increase of tensile strength and impact strength were 119%,430%,respectively.更多还原