细菌纤维素/聚乙烯醇复合材料的制备及性能

摘要

采用浸渍法向细菌纤维素(BC)中引入聚乙烯醇(PVA),对BC/PVA复合材料的结构、光学性能及力学性能进行研究.当浸渍液中PVA浓度为20 g/L时,力学性能及光学性能测试表明,复合材料在保持BC超高力学强度的同时光学性能较纯BC显著提高,透光率最高可达90.74%,可见光区最多提高24.26%.扫描电子显微镜及X射线衍射表明,大量自由PVA渗入BC网络结构,复合材料层状结构淡化,结晶度下降.%Bacterial cellulose (BC) was immersed into poly(vinyl alcohol) (PVA) solution to produce BC/PVA composites. The structure,optical properties and mechanical properties of composites were studied. When the PVA concentration of PVA solution is 20 g/L,the clarity of composite is obviously enhanced. The maximum value of clarity is 90.74% and the maximum rate of increase in visible light region is 24.26%. Meanwhile,the tensile strength as well as tear strength of BC/PVA composite are almost the same as pure bacterial cellulose. SEM and XRD reveal that lots of free PVA penetrates into bacterial cellulose network. The structure of composites turn into cellular from laminar. The degree of crystallinity decreases.