有机MMT对高密度聚乙烯改性的研究

采用十二烷基三甲基氯化铵、十六烷基三甲基氯化铵、十六烷基三甲基溴化铵和双十八烷基二甲基氯化铵4种阳离子表面活性剂对钠基蒙脱土(MMT)进行有机化处理，制备了有机MMT(OMMT)。将OMMT与高密度聚乙烯(HDPE)进行熔融插层制备了HDPE／OMMT纳米复合材料，研究了OMMT的层间距同季铵盐烷基链的关系。结果表明，OMMT的层间距随烷基链长度的增加而增大；随着OMMT含量的增加，HDPE／OMMT纳米复合材料的断裂伸长率和拉伸强度降低，弯曲弹性模量增加，弯曲强度出现极大值，使该纳米复合材料的力学性能得到了一定的改善。

STUDY ON MODIFYING OF HIGH DENSITY POLYETHYLENE BY ORGANIC MMT

The sodium montmorillonite(MMT) is treated by four kinds of cation surfactants such as dodecyl trimethyl ammonium chloride, hexadecyl trimethyl ammonium chloride, hexadecyl trimethyl ammonium bromide and di-octadecyl dimethyl ammonium chloride, and organic MMT(OMMT) is obtained. HDPE/OMMT nanometer composite is prepared through melt intercalation. At the same time, the relationship of interlayer space of OMMT with the alkyl chain of quaternary ammonium salt is studied. The results show that the interlayer space of OMMT increases with the growth of alkyl chain. With the increase of content of OMMT, the breaking elongation and tensile strength of HDPE/OMMT nanometer composite decrease, the flexural modulus increases, the flexural strength occurs the maximum, and the mechanical properties of the composite get certain improvement.