摘要
微生物转化得到高分子短梗霉多糖 ,利用 HAAKE RVl2流变仪测量了多糖的粘性和流变性能 ,随着多糖分子量增大和浓度增加 ,其非牛顿指数相应减小 ;对多糖进行热分析证明多糖无熔融和结晶特性 ;流涎法制得 0 .0 2 mm厚的薄膜 ,薄膜的 SEM照片表明膜的二侧面不对称 ;薄膜的力学强度随多糖分子量增大而增大 ;多糖水分含量对多糖薄膜的热封性有重要影响 ,完全脱水的薄膜不具有热封性 ;
Polysaccharide pullulan was synthesised from farm by products by microorganism Aureobasidiun pullulans. The viscosity and rheological properties of the polymer were tested with a HAAKE RV12 rheometer. The non newtonian index decreases with the increament of polysaccharide concentration and molecular weight. Thermal analysis proves the polysaccharide has no melting and crystalline characteristic. The polymer was manufactured into 0.02 mm thick film, SEM photograph of the film indicates the two sides of the film surface are asymmetrical. The film tensile strength and elongation percentage increase with the increament of the polymer molecular weight. The water content has importent effect on sealing ability of the film, water free polysaccharide films lose heat sealing ability. The film has notable oxygen impermeability.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2001年第3期118-121,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目
关键词
高分子短梗霉多糖
流变性
多糖薄膜
力学强度
热封性
pullulan
rheological property
pullulan film
mechanical strength
heat sealing ability
