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以十六烷基季铵盐有机化蒙脱土(MMT)为无机相,以乙烯-乙烯醇共聚物为基体,通过熔融插层法制备了聚乙烯-乙烯醇/有机蒙脱土(EVOH/MMT)纳米复合材料,利用示差扫描量热仪(DSC)研究了EVOH/MMT复合材料的结晶行为。结果表明:MMT与EVOH插层后使EVOH/有机蒙脱土纳米复合材料的熔点和熔融热降低。经季铵盐处理过的蒙脱土片层在EVOH/有机蒙脱土纳米复合材料结晶过程中的异相成核作用不明显。在相同结晶条件下,EVOH/MMT纳米复合材料的结晶速率比EVOH慢。MMT的加入使EVOH/MMT纳米复合材料的熔融温度(Tm)从EVOH的180.7℃降低到175.2℃,结晶温度(Tc)从EVOH的157.9℃降低到153.1℃,而玻璃化转变温度(Tg)却较EVOH升高了大约2.6℃。
Polyethylene / vinyl alcohol / montmorillonite (EVOH / montmorillonite) was prepared by melt intercalation method using cetyl quaternary ammonium montmorillonite (MMT) as the inorganic phase and ethylene-vinyl alcohol copolymer as the matrix. MMT) nanocomposites, the crystallization behavior of EVOH / MMT composites was investigated by differential scanning calorimetry (DSC). The results show that the melting point and the heat of fusion of the EVOH / OMMT nanocomposites decrease after MMT and EVOH intercalation. Heterogeneous nucleation of the quaternary ammonium salt montmorillonite layer during EVOH / MMT nanocomposite crystallization was not obvious. Under the same crystallization conditions, the crystallization rate of EVOH / MMT nanocomposites is slower than that of EVOH. The addition of MMT decreased the melting temperature (Tm) of EVOH / MMT nanocomposites from 180.7 ℃ to 175.2 ℃ and the crystallization temperature (Tc) from 157.9 ℃ to 153.1 ℃ of EVOH, while the glass transition temperature About 2.6 ° C higher than EVOH.