高强度高气体阻隔性羧甲基纤维素钠/蒙脱土复合材料制备及性能研究

Preparation and property of sodium carboxymethylcellulose/montmorillonite nanocomposite with good mechanical strength and gas barrier

将蒙脱土(MMT)填充到羧甲基纤维素钠(CMC)中制得CMC/MMT复合膜,研究MMT用量对CMC/MMT复合膜的力学性能和气体阻隔性能的影响,用扫描电镜和透射电镜进行结构分析。结果表明,添加适量的MMT可以显著提高CMC/MMT复合膜的力学性能和气体阻隔性能。当MMT添加量为10%(wt,质量分数)时,CMC/MMT复合膜的拉伸强度由105MPa提高到375MPa,水蒸汽透过系数为2.079×10^(-6)g·cm/m^2·s·Pa,透氧系数为1.65×10^(-15)cm^3·cm/cm^2·s·Pa。此外,由于MMT具有耐火性,CMC/MMT复合膜具有良好的阻燃性。

The montmorillonite was filled into sodium carboxymethylcellulose （CMC） films in order to reinforce modified CMC based films. The influence of MMT content on mechanical properties and barrier property of CMC compos- ites was researched,and the structure of composite membranes was analyzed by XRD,SEM and TEM. The results indicated that the appropriate amount of MMT could improve the mechanical properties and gas barrier of CMC-based films significantly. When 10G MMT was added,the tensile strength could be increased from 105MPa to 375MPa and the water vapor permeability was 2.079×10^-6g·cm/m^2·s·Pa, oxygen permeability coefficient was 1.65×10^-15cm^3·cm/cm^2·s·Pa. In addition, the composite membrane had good fire resistance property with the addition of MMT.