交联壳聚糖/蒙脱土复合膜的制备及性能研究

以壳聚糖（CS）为基质材料，蒙脱土（MMT）为填料，采用戊二醛（GA）交联改性并结合溶液插层法制备了交联壳聚糖/蒙脱土（CS/GA/MMT）复合膜。通过扫描电子显微镜、X射线衍射仪、红外光谱仪及热重分析仪对复合膜的结构进行了表征，考察了MMT用量对复合膜的吸水性能、水蒸气阻隔性能和力学性能的影响。结果表明，交联改性CS可提高CS膜的耐水性，CS/GA膜的吸水率较CS膜降低了9.6 %；MMT可提高复合膜的耐水性、水蒸气阻隔性能、力学性能和热稳定性；当MMT的用量为CS质量的5 %时，复合膜的各项性能较好，吸水率、水蒸气透过率和断裂伸长率较CS膜分别降低了37.3 %、36.7 %和41.9 %，且拉伸强度提高了160.5 %。

Preparation and properties of crosslinked chitosan/montmorillonite composite films

Crosslinked chitosan （CS）/montmorillonite （MMT） composite films were prepared through a solution intercalation method using CS as a matrix， MMT as a filler， and glutaraldehyde （GA） as a crosslinking agent. Their structure and properties were characterized using infrared spectroscopy， scanning electron microscopy， X?ray diffraction， and thermogravimetric analysis. The effect of MMT content on the water uptake， water vapor barrier and mechanical properties of the composite films were investigated. The results indicated that the composite films exhibited an improvement in water resistance， and their water uptake ratio decreased by 9.6 % compared to that of pure CS film. The introduction of MMT improved the water resistance， water vapor barrier property， mechanical performance， and thermal stability of the composite films. The composite films exhibited better comprehensive properties at a MMT content of 5 wt% in the CS domain. Compared to pure CS film， the composite films presented a decrease in water uptake ratio， water vapor transmission rate， and elongation at break by 37.3 %， 36.7 %， and 41.9 %， respectively. Their tensile strength increased by 160.5 %. The composite films exhibit potential applications as a food packaging material.