ZnCl2对聚乳酸结晶行为和加工性能的调控  

Modulating Control of ZnCl2 on Crystallization Behavior and Processability of PLA

作　　者：张丰 罗筑[1,2] 杨乐[1,2] 杨再军[1,2] 谢丽锦 Zhang Feng;Luo Zhu;Yang Le;Yang Zaijun;Xie Lijin(College of Materials and Science Metallurgy Engineering,Guizhou University,Guiyang 550003,China;National Engineering Research Center for Compounding and Modifi cation of Polymeric Materials,Guiyang 550014,China)

机构地区：[1]贵州大学材料与冶金学院高分子材料工程系,贵州贵阳550003 [2]国家复合改性聚合物材料工程技术研究中心,贵州贵阳550014

出　　处：《塑料科技》2018年第10期51-56,共6页Plastics Science and Technology

摘　　要：加入氯化锌（ZnCl2）在熔融状态下对聚乳酸（PLA）进行改性,以利用路易斯酸ZnCl2的配位作用屏蔽PLA分子链间氢键,使其分子间作用力减弱,从而使PLA在较低温度下即具有较高的流动性。结果表明：ZnCl2的加入使PLA的结晶度降低,但结晶速率增大,黏流温度大幅降低,从而得到可用于低温加工的PLA材料。同时,ZnCl2的加入使PLA的分子量分布变窄,分子量和玻璃化转变温度降低,热分解温度显著下降。The modifi cation of polylactic acid（PLA） in the melting state by adding zinc chloride（ZnCl2） was carried out, in order to shield the hydrogen bonds among PLA chains（which owing to the coordination between Lewis acid ZnCl2 and PLA）, decrease the intermolecular forces, and then a kind of modifi ed PLA material could be obtained. The results show that, lower crystallinity, higher crystallization rate, and much lower viscosity flow temperature of the modified PLA can be observed compared with the pristine PLA, put it another way, this modified PLA can be applied into the field of low temperature processing. Moreover, narrower molecular weight distribution, smaller molecular weight, lower glass transition temperature and much lower thermal decomposition temperature of modified PLA can be also seen compared with the pristine PLA owing to the introduction of ZnCl2.

关 键 词：聚乳酸 熔融共混 结晶行为 路易斯酸 加工性能 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]