6，7-二甲氧基香豆素的合成工艺改进

利用蒙脱土(MMT)的阳离子交换特性,将十二烷基三甲基氯化铵(BS-12)引入蒙脱土层间,对蒙脱土进行有机化预处理,使蒙脱土在甲基丙烯酸甲酯(MMA)中的分散性提高。借助普通乳液聚合的方法,制备出聚甲基丙烯酸甲酯(PMMA)/蒙脱土嵌入混杂材料。对混杂材料进行XRD分析,结果表明PMMA嵌入了蒙脱土层间,使层间距明显扩大。采用熔融共混的方法制备了PVC/蒙脱土复合材料,并对其强度和韧性进行了研究。结果表明,聚甲基丙烯酸甲酯/蒙脱土嵌入混杂材料可使PVC的强度和韧性分别提高17%和489.2%。

Improved synthesis technics of 6,7-dimethoxy coumarin

Based on the characteristic of negative charges exchange of montmorillonite(MMT),making the dodecyl trimethyl ammonium chloride(BS-12) imbedded in the layer of MMT,we pretreated MMT and enhanced the dispersion of MMT in MMA.By means of emulsion polymerization,PMMA organ-MMT imbedding composite was prepared.By means of XRD,analysis indicated that PMMA was imbedded in the layer of montmorillonite and the layer distance was expanded obviously.Then using melt blending method,PVC/MMT composite was prepared and the intensity,toughness were also studied.The results show that PMMA organ-MMT imbedding composite can respectively enhance the intensity and toughness of PVC by 17% and 489.2%.