【作者】 刘洋； 陈煜；

【Author】 LIU,Yang;CHEN,Yu;School of Material Science and Engineering Beijing Institute of Technology;

【机构】 北京理工大学材料学院；

【摘要】 基于聚阴离子羧甲基纤维素(CMC)和阳离子铝离子(Al3+)间静电作用以及大分子间物理缠结等的三维空间网状结构的构建,羧甲基纤维素、羟乙基纤维素(HEC)和铝离子作为一种新的聚电解质复合体系成功制备出了具有良好溶胀性能的聚电解质水凝胶。实验采用傅里叶变换红外光谱(FTIR),热重分析(TGA)和扫描电子显微镜(SEM)等方法对水凝胶的结构进行表征。溶胀凝胶的粘弹性行为通过流变学的测试进行表征。实验结果表明经冻干处理后的凝胶具有多孔的表面结构并且随凝胶中CMC/HEC和Al3+所占质量分数的增加凝胶表面的空洞直径逐渐减小。实验对比了经烘干和冻干两种方法获得的干凝胶在纯水及生理盐水中的溶胀性能并进行了溶胀动力学的量化模拟。结果表明,水凝胶的空间网状结构受电解质间静电作用,大分子链间的氢键作用以及聚合物分子链间的物理缠结的影响,其中静电作用的影响占主导地位。这种聚电解质复合水凝胶表现出了良好的溶胀性能并在伤口敷料领域表现出宽广的应用前景。更多还原

【Abstract】 A novel carboxymethyl cellulose/ hydroxyethyl cellulose-Al3+(CMC/HEC-Al3+) hydrogel was prepared through the electrostatic complexing between the anionic polyelectrolyte CMC and cationic crosslinking agent Al3+. A sponge and membrane were prepared from the CMC/HEC-Al3+ hydrogel by freeze-drying and oven drying, respectively.The structure and property of the hydrogel were characterized by FTIR, TGA and SEM. The viscoelasticities of the swollen hydrogel were measured by the rheology test. The results indicate that electrostatic effect, physical entanglement and intra- and intermolecular hydrogen bonds contribute the crosslinking network structure and the electrostatic effect is the dominant. In all, both superabsorbent sponge and membrane prepared from CMC/HEC-Al3+ hydrogel showed an excellent swelling behavior and could be used as a wound dressing.更多还原