层层自组装复合膜的制备及性能研究

Preparation of layer-by-layer self-assembled composite films and properties

为获得具有高阻隔性能和机械性能的复合膜材料,利用诱导蒸发法将蒙脱土(MMT)、羧甲基壳聚糖(CMCS)和氧化石墨烯(GO)通过层层自组装技术制备二元及三元复合膜。利用DLS、FT-IR、AFM、SEM对其进行表征。结果表明,无机片层MMT、GO与聚合物CMCS之间通过静电、氢键作用等作为驱动力,最终形成类似珍珠层“水泥-砖块”的致密层状结构。阻隔性能实验表明,复合膜材料对水的滤失量小于20 mL。力学性能测试结果表明,在复合膜料m(MMT)∶m(CMCS)=1∶1的基础上加入质量分数为2%的GO时,横向拉伸杨氏模量和纵向杨氏模量分别可达到23.35 GPa和82.73 GPa。

In order to obtain composite film materials with high barrier properties and strong mechanical properties, binary and ternary composite membranes are prepared by layer-by-layer self-assembly of montmorillonite(MMT),carboxymethyl chitosan(CMCS) and graphene oxide(GO) through an induced evaporation method.The membrane samples are characterized by means of DLS,FT-IR,AFM and SEM.The results show that the inorganic lamellar MMT,GO and polymer CMCS are driven by electrostatic interaction and hydrogen bond, and finally form a dense layer structure similar to pearl layer-like “cement-brick”.It is shown through barrier performance experiment that the water loss by the composite membranes is less than 20 mL.It is indicated through mechanical properties that the transverse and longitudinal Young’s modulus can reach 23.35 GPa and 82.73 GPa, respectively when the composition of the composite membranes is m(MMT)∶m(CMCS)=1∶1 and the dosage of GO is 2%.