羧甲基纤维素钠蒙脱土纳米复合膜的制备及性能

用溶液插层法制备出了剥离型羧甲基纤维素钠 蒙脱土纳米复合物 .X射线衍射结果中蒙脱土d0 0 1 峰的消失证实了纳米复合物的生成 ,透射电镜观察表明硅酸盐片层在羧甲基纤维素钠基体中达到了纳米级的分散 .红外测试表明 ,羧甲基纤维素钠分子上的醚键和蒙脱土分子上的硅氧键、铝氧键之间强的作用力是插层的驱动力 .加入蒙脱土后 ,提高了羧甲基纤维素钠膜的拉伸强度、热稳定性 ,降低了其水蒸汽透过系数 .

SYNTHESIS AND PROPERTIES OF SODIUM CARBOXYMETHYLCELLULOSE/MONTMORILLONITE NANOCOMPOSITES

Sodium carboxymethylcellulose/montmorillonite nanocomposites were prepared by using the solution intercalation technique. The (001) diffraction peak was not observed in the X-ray diffraction pattern of the composites. TEM studies indicated that the silicates were exfoliated and distributed in the carboxymethylcellulose matrix at the nanometer level. Infrared spectroscopy analysis revealed that the interaction between the ether oxygen atoms of the celulose molecules and the silicon-oxygen and/or the aluminum-oxygen bonds of montmorillonite might be the driving force for intercalation for the composite system. The thermal stability and the tensile strength of the sodium carboxymethylcellucose nanocomposites were improved and their water vapor permeability was decreased as compared to those of the pure polymer.