摘要
目的将聚乙烯醇(PVA)引入壳聚糖(CS)/有机累托石(OREC)复合体系制备插层效果、力学性能、抗紫外老化及阻隔性能良好的插层纳米复合膜。方法利用溶液流延法制备PVA-CS/OREC系列复合膜,以XRD及SEM研究复合膜的插层结构及OREC在基体中的分散性,研究复合膜的力学性能、抗紫外辐射性及水蒸气透过性。结果 OREC及PVA添加量较少时可与CS形成良好的插层结构。当OREC质量分数为2%,PVA质量分数为10%时的复合膜(标记为PVA10-CS/OREC2)插层结构最好,OREC在CS及PVA基体中分散性最好,与OREC质量分数为2%且不含PVA的复合膜(标记为CS/OREC2)相比,拉伸强度提高42.2%,断裂伸长率提高30%,水蒸气透过量降低10.2%,复合膜经紫外辐射后拉伸强度保持率、断裂伸长保持率仍达82.5%及68.2%。结论 PVA10-CS/OREC2膜可作为医用膜和药品、食品等的包装材料。
Intercalated nanofilms with excellent intercalation effect, mechanical properties, anti-ultraviolet properties as well as barrier properties are obtained by introducing polyvinyl alcohol into chitosan/organic rectorite composite system. The polyvinyl alcohol （PVA）-chitosan （CS）/organic rectorite （OREC） series films were prepared by solution cape casting. The intercalation structure and dispersity of OREC in the matrix of composite films were analyzed by XRD and SEM. The mechanical and anti-ultraviolet properties as well as water vapor permeability were investigated. The results showed that the excellent intercalation structure of PVA-CS/OREC composite films could be obtained with low OREC and PVA content. The PVA10-CS/OREC2 composite film had the best intercalation structure when the mass fraction of OREC and PVA were 2% and 10% respectivcly. OREC had the best dispersity in the matrix of CS and PVA. Compared with the composite film （CS/OREC2） with 2% OREC but no PVA, the tensile strength and the elongation at break were 42.2% and 30% respectively higher and the water vapor transmission reduced by 10.2%. The tensile strength and elongation break of composite film by untraviolated radiation maintained at 82.5% and 68.2% respectively. In conclusion, PVA10-CS/OREC2 film can be used as medical film and also packing materials for food and pharmaceuticals, etc.
出处
《包装工程》
CAS
CSCD
北大核心
2016年第17期80-84,共5页
Packaging Engineering
基金
陕西省自然科学基金(2014JM2049)
陕西省教育厅科学基金(12JK0610)
