聚乳酸/聚氨酯共混体系相容性研究  

Study on compability of poly(lactic-acid)/polyurethane blends

作　　者：王琰[1] 左丹英[1] 

机构地区：[1]武汉纺织大学材料科学与工程学院,湖北武汉430073

出　　处：《化学研究与应用》2011年第9期1142-1145,共4页Chemical Research and Application

基　　金：湖北省教育厅科研计划项目(B20091704);武汉纺织大学青年基金(093866)

摘　　要：采用热塑性聚氨酯弹性体(TPU)作为改性剂来增韧聚乳酸(PLA),通过溶度参数法、聚合物混合焓变法预测了TPU和PLA的相容性,并且通过稀溶液粘度法、动态热机械分析(DMA)及扫描电镜(SEM)对两者相容性进行表征,结果显示PLA和TPU为部分相容体系。共混溶液的粘度与组成含量的变化呈非线性关系;PLA/TPU共混膜的动态热机械分析(DMA)结果显示出介于纯聚合物Tg峰之间的两个Tg峰,且随着TPU含量的增加,两个Tg峰相向移动;扫描电镜(SEM)观察发现,随着TPU含量的增加,共混膜断面由"海岛"结构逐步转变为双连续结构,其相容性增强。Blending poly（lactic-acid）（PLA）and polyurethane（TPU）has been performed in an effort to toughen the PLA without compromising its biodegradability and biocompatibility.The compability of the blend were predicted by solubility parameters and mixing enthalpy calculating,then investigated by dilute solution viscosity measurements,Dynamic Mechanical Analysis（DMA）and Scanning Electron Microscopy（SEM）.The blend was found to be a partly compatible system.It was found that a nonlinear relationship existed between the solution viscosity and the ratio of PLA/TPU.The DMA showed that the glass transition temperatures of PLA and TPU shifted towards with TPU content increasing.SEM photos showed that the morphologies of PLA/TPU blends changed from the sea island structure to the bicontinuous structure as an increment of TPU content,which suggested that the compatibility of PLA and TPU was enhanced when the TPU increased.

关 键 词：PLA TPU 溶液共混 相容性 

分 类 号：O633.221[理学—高分子化学]