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- W97450141 startingPage "73" @default.
- W97450141 abstract "将乳酸在催化剂存在下脱水环化合成了D,L-丙交酯 (D,L-LA).研究了催化剂用量、脱水温度及稀释剂等对D,L-LA产率的影响, 纯D,L-LA的产率最高可达37.3%.将D,L-LA以二甲苯为溶剂、辛酸亚锡为催化剂,经开环聚合得PDLLA.通过正交试验分析了单体浓度、引发剂用量、反应温度和时间等因素对产物分子量的影响,确定了最佳聚合条件为:单体浓度4.62 mol/L, n(SnOct2)/n(D,L-LA)=1∶400,聚合温度为120 ℃,聚合时间为8 h.利用最优条件,可制得v为76,000的PDLLA.通过同核去偶1H-NMR谱对PDLLA的序列结构进行了表征.结果表明,所合成的丙交酯单体为外消旋型,不含内消旋型丙交酯(meso-LA);且在聚合过程中无消旋化及酯交换反应发生." @default.
- W97450141 created "2016-06-24" @default.
- W97450141 creator A5007632494 @default.
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- W97450141 creator A5091344370 @default.
- W97450141 date "2005-01-01" @default.
- W97450141 modified "2023-09-24" @default.
- W97450141 title "D,L-丙交酯的制备及在二甲苯溶液中的开环聚合" @default.
- W97450141 hasPublicationYear "2005" @default.
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