PLLA/PEG共混物结晶行为研究  

Crystallization Behavior of PLLA/PEG Blends

作　　者：罗春燕[1] 陈卫星[1] 李永飞[1] 

机构地区：[1]西安工业大学材料与化工学院,西安710021

出　　处：《西安工业大学学报》2013年第8期638-642,674,共6页Journal of Xi’an Technological University

基　　金：陕西省自然科学研究项目(2004A18);陕西省教育厅专项科研计划项目(2010JK585)

摘　　要：利用L-丙交酯为原料开环聚合制备了左旋聚乳酸(PLLA),并利用傅里叶红外变换光谱仪(FTIR)表征其结构.利用偏光显微镜(PLM)、差示扫描量热仪(DSC)以及X-射线衍射仪(XRD)考察了PLLA、聚乙二醇(PEG)以及PLLA/PEG共混物的结晶行为.DSC结果表明,PLLA的结晶行为发生在升温过程,结晶峰温度为98℃,其熔融峰温度为157℃.对于PLLA/PEG共混物,当PLLA∶PEG为5∶5时两者都发生了结晶行为.利用偏光显微镜观察此共混物的结晶形貌发现,PLLA和PEG分别于95℃和35℃发生了分步结晶.Poly (L-lactic acid) (PLLA ) is synthesized from L-lactide via ring-opening polymerization (ROP) method ,and the structure is characterized by Fourier transform infrared spectroscopy (FTIR) . Then the polarized optical microscopy (PLM ) ,differential scanning calorimeter (DSC ) and X-ray diffraction (XRD) are used to characterize the crystallization behavior of PLLA ,Poly(ethylene glycol) (PEG) and PLLA/PEG blends .For the pure PLLA ,the cold crystallization behavior occurs at 98 ℃during the heating process ,and the corresponding melting peak temperature is 157 ℃ .For the blend , with weight ratio of 5 ∶ 5 ,the crystallization behavior can be observed for both PLLA and PEG components .The PLM observation results show that the cystallization behaviors of PEG and PLLA occur at 95 ℃ and 35 ℃ ,respectively .

关 键 词：左旋聚乳酸 聚乙二醇 共混物 结晶行为 

分 类 号：TQ321.2[化学工程—合成树脂塑料工业]