交联壳聚糖/聚乙烯醇/蜗牛黏液复合膜的制备及性能研究

采用延流法制备了香兰素（V）交联的壳聚糖/聚乙烯醇/蜗牛黏液（CS/PVA/SM）复合膜，并通过热重分析仪（TG）、扫描电子显微镜（SEM）和万能材料试验机等研究了不同CS/SM配比对复合膜光学性能、水蒸气和氧气阻隔能力、力学性能、热力学性能及生物降解性能等的影响。结果表明，CS/PVA/SM复合膜为可降解的亲水性薄膜，当CS溶液/SM溶液体积比为5/3时，复合膜性能优良，其抗氧化活性为87.51 %，其水蒸气透过率比纯CS膜降低了75.16 %，不透明度降低了87.74 %，拉伸强度提高了16.04 %，断裂伸长率提高了28.26倍；随着SM含量的增加，复合膜的热稳定性有所降低；CS溶液/SM溶液体积比为5/1、5/2和5/3时，复合膜表现出良好的相容性；SM的添加使复合膜具有很好的延展性和柔韧性，V的添加提高了复合膜的拉伸强度和抗氧化能力；所制备的CS/PVA/SM复合膜在食品包装领域中有潜在的应用前景。

Preparation and properties of chitosan/polyvinyl alcohol/snail mucus composite films

Chitosan （CS）/poly（vinyl alcohol） （PVA）/snail mucus （SM） composite films were prepared through crosslin?king with vanillin using a casting method. The effect of CS/SM mass ratio on the optical properties， water vapor permeability， water vapor， oxygen barrier capability， and mechanical and biodegradable properties of the composite films were investigated using a thermogravimetric analyzer， a scanning electron microscope， and a universal material testing machine. The results indicated that the composite films were biodegradable and hydrophilic， and their properties were optimal when the volume ratio of CS solution to SM solution was set to 5/3， presenting an antioxidant activity of 87.51%. Comparing to pure CS film， the composite films showed a decrease not only in water vapor transmission rate by 75.16 % but also in opacity by 87.74 %. However， they showed an increase in tensile strength by16.03 % and in elongation at break by a factor of 28.26. The thermal stability of the composite films decreased with an increase in the proportion of SM. In addition， the composite films exhibited good compatibility at CS/SM volume ratios of 5/1， 5/2， and 5/3. The addition of SM endowed the composite films with good ductility and flexibility， whereas the addition of vanillin improved their tensile strength and antioxidant activity. The CS/PVA/SM composite films exhibit potential prospects in the application for food packaging.