Poly（lactic acid）/montmorillonite nanocomposites were prepared by the melt inter calation method. Their structures and thermal properties were investigated by WA XD, DSC and TGA techniques. The WAXD results show tha...Poly（lactic acid）/montmorillonite nanocomposites were prepared by the melt inter calation method. Their structures and thermal properties were investigated by WA XD, DSC and TGA techniques. The WAXD results show that the interlayer spacin g of montmorillonite in the nanocomposites was increased after melt intercalat ion, indicating that the molecular chains of poly（lactic acid） had been interc alated into the montmo-rillonite layers. The thermal stability of poly（lact ic acid） was obviously improved after intercalation with montmorillonite. Compar ed with that of pure poly（lactic acid）, the thermal decomposition temperatures o f the nanocomposites were increased by about 22.5 ℃ in air and 14 ℃ in N2 , respectively.展开更多
利用席佛碱催化体系催化二氧化碳(CO2)和环氧氯丙烷(ECH)共聚反应,合成出新型环状碳酸酯(ECHCO2)。利用红外光谱、核磁等方法对产物进行了表征。结果表明,最优化的试验温度是60℃,这一催化剂体系催化的活性高达920 polymer/(mol Co h),...利用席佛碱催化体系催化二氧化碳(CO2)和环氧氯丙烷(ECH)共聚反应,合成出新型环状碳酸酯(ECHCO2)。利用红外光谱、核磁等方法对产物进行了表征。结果表明,最优化的试验温度是60℃,这一催化剂体系催化的活性高达920 polymer/(mol Co h),并且有较高的选择性,高达99%。展开更多
文摘Poly（lactic acid）/montmorillonite nanocomposites were prepared by the melt inter calation method. Their structures and thermal properties were investigated by WA XD, DSC and TGA techniques. The WAXD results show that the interlayer spacin g of montmorillonite in the nanocomposites was increased after melt intercalat ion, indicating that the molecular chains of poly（lactic acid） had been interc alated into the montmo-rillonite layers. The thermal stability of poly（lact ic acid） was obviously improved after intercalation with montmorillonite. Compar ed with that of pure poly（lactic acid）, the thermal decomposition temperatures o f the nanocomposites were increased by about 22.5 ℃ in air and 14 ℃ in N2 , respectively.
