离子液体/壳聚糖复合膜的制备及性能研究
Study of preparation and properties of ionic liquid/chitosan composite membrane
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摘要: 通过溶液蒸发铸膜法制备壳聚糖膜及离子液体/壳聚糖复合膜.利用傅里叶红外光谱仪、原子力扫描探针显微镜和动态热机械分析等测试手段分析了样品的结构、形貌和动态力学性能.结果表明,壳聚糖中加入离子液体形成复合膜,离子液体加入壳聚糖不仅是简单的物理混合,两者之间有氢键等作用力存在;离子液体对壳聚糖膜结晶形貌有较大影响,纯壳聚糖膜结晶为细长针状,且分散均匀,样品表面比较平整;加入离子液体后,呈球形颗粒状,且随着其加入量的增多,颗粒尺寸呈先增大后减小的趋势.当加入量为20%时,颗粒尺寸最大,表面粗糙度达267.74 nm;复合膜的储能模量达到最大,约是纯壳聚糖膜储能模量的1.5倍;但离子液体的加入并未明显改变其玻璃化转变温度.Abstract: The ionic liquid/chitosan composite membrane was prepared by solution casting.Structure,morphology and mechanical properties of the composites were analyzed by FT-IR,AFM and DMA.The results showed that there existed significant physical interactions such as hydrogen bond between the ionic liquid and chitosan.There was a great impact on the crystal morphology of the chitosan with the addition of ionic liquids.The pure chitosan looked like slender needle with good distribution and its surface was flat.Whereas the spherulites particles were observed and the particle size increased firstly,then decreased.When adding content was 20%,the particle size was the largest,and corresponding surface roughness was 267.74 nm;the storage modulus of composite membrane achieved maximum,about 1.5 times than that of the pure chitosan film.But with the addition of ionic liquids,there was no obvious change of chitosan membrane glass transition temperature.
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Key words:
- chitosan /
- ionic liquid /
- composite membrane /
- dynamic mechanical property
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