作　　者： ; ; ;

机构地区： 华南理工大学材料科学与工程学院

出　　处： 《合成树脂及塑料》 2005年第2期31-34,共4页

摘　　要： 为了得到综合性能较佳的生物降解材料聚乳酸-聚乙二醇(PLEG),以SnO为催化剂,直接以外消旋乳酸单体为原料,与不同数均分子量(Mn)的聚乙二醇(PEG)共聚合,通过直接熔融共聚法,在165℃、70Pa下,反应15h,合成了系列PLEG。用特性黏数测试、傅里叶变换红外光谱、核磁共振氢谱、差示扫描位热法、X射线衍射、接触角测试等手段对其进行表征,发现PEG的Mn为1000时,特性黏数最大,为0.4009dL/g,且亲水性得到改善。 In order to acquire biodegradable materials with good comprehensive performance, a series of polylactic acid-polyethylene glycol (PLEG) was synthesized with stannous oxide as catalyst via direct melt copolymerization of D,L-racemic lactic acid (D,L-LA) as monomer with polyethylene glycol (PEG) having different number average relative molecular weight (Mn) at feed weight ratio of m(LA)/m(PEG)=9. The copolymerization reaction was performed at temperature of 165°C and pressure of 70 Pa for 15 hours. The PLEG resultants were characterized with intrinsic viscosity measurement, Fourier transform infrared spectroscopy, hydrogen spectrum of nuclear magnetic resonance, differential scanning calorimetry, X-ray diffraction and contact angle testing. The results demonstrate that the highest intrinsic viscosity of 0.4009 dL/g and better hydrophilicity can be reached in case Mn of PEG is chosen as 1000.

关 键 词： 特性黏数 直接合成 聚乳酸 共聚法 聚乙二醇 熔融 单体 外消旋 数均分子量 核磁共振氢谱

领　　域： [化学工程] [化学工程]