聚乳酸熔体流变性的研究  

Study on the rheological behavior of poly-lactic acid melt

作　　者：沈新元[1] 刘洪斌[2] 金晨倩[3] 王胜东[3] 郯志清[3] 杨庆[3] 

机构地区：[1]东华大学纤维材料改性国家重点实验室,上海200051 [2]中国石油化工股份有限公司,北京100029 [3]东华大学材料科学与工程学院,上海200051

出　　处：《合成纤维工业》2002年第5期1-3,共3页China Synthetic Fiber Industry

基　　金：中国石油化工股份有限公司科学技术研究开发项目 (编号 2 0 0 5 5 )

摘　　要：研究了聚 L -乳酸熔体的流变性 ,并与 PET熔体流变性进行了比较 ,发现聚 L -乳酸流体为切力变稀流体 ,当温度达 2 2 5℃ ,流动曲线上出现了第二牛顿区 ;粘流活化能高达 12 3k J/m ol;随着熔体温度的增大 ,其流动曲线下移 ,表观粘度下降 ,非牛顿指数增大 ,在 2 0 5～ 2 15℃区域内上升速率较大 ,其结构粘度指数变小 ,同时特性粘数的下降高达 39%。The rheological behavior of poly-lactic acid melt was studied and compared with that of PET melt. It was found that poly-lactic acid melt was shear-thinning fluid, and the second Newtonian area occured at 225℃ in the flow curve. The viscous flow activation energy was up to 123 kJ/mol. While increasing melt temperature, the flow curve moved downwards, the apparent viscosity decreased, and the non-Newtonian index increased. In the range of 205～215℃, the climbing rate became greater, the structural viscosity index became lower, and the intrinsic viscosity drop was up to 39%.

关 键 词：聚乳酸 熔体 流变性 粘流活性能 纤维 

分 类 号：TQ340.63[化学工程—化纤工业]