STUDIES ON THE RING-OPENING POLYMERIZATION OF D,L- LACTIDE BY USING IRON(Ⅲ) ACETYLACETONATE AS CATALYST

WANG Xiaoying; LIAO Kairong; QUAN Daping; WU Qing

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STUDIES ON THE RING-OPENING POLYMERIZATION OF D,L- LACTIDE BY USING IRON(Ⅲ) ACETYLACETONATE AS CATALYST

Research Article | 更新时间：2021-03-19

- STUDIES ON THE RING-OPENING POLYMERIZATION OF D,L- LACTIDE BY USING IRON(Ⅲ) ACETYLACETONATE AS CATALYST
- Acta Polymerica Sinica Issue 1, Pages: 113-118(2005)
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- Published：20 February 2005，
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WANG Xiaoying, LIAO Kairong, QUAN Daping, WU Qing. STUDIES ON THE RING-OPENING POLYMERIZATION OF D,L- LACTIDE BY USING IRON(Ⅲ) ACETYLACETONATE AS CATALYST. [J]. Acta Polymerica Sinica (1):113-118(2005)
DOI：

WANG Xiaoying, LIAO Kairong, QUAN Daping, WU Qing. STUDIES ON THE RING-OPENING POLYMERIZATION OF D,L- LACTIDE BY USING IRON(Ⅲ) ACETYLACETONATE AS CATALYST. [J]. Acta Polymerica Sinica (1):113-118(2005) DOI：

摘要

以乙酰丙酮铁 [Fe(acac)3]为催化剂进行D

L-丙交酯的开环聚合及在聚乙二醇 (PEG)存在下的开环共聚

研究了催化剂用量、反应温度和反应时间对聚合反应的影响以及PEG用量对共聚反应的影响

并探讨了丙交酯开环聚合机理 .结果表明

Fe(acac)3是按配位插入机理催化丙交酯开环聚合的 ;在本文的聚合条件下

大部分聚合的单体转化率都达90%以上

聚合产物的粘均分子量最高可达66 000

均显示出较好的催化性能.在PEG存在下

PEG作为引发剂参入了丙交酯的开环聚合

L-丙交酯是沿着PEG分子两端开环聚合的

分子链的链端结构是以羟基为端基的乳酰基结构单元

Fe(acac)3有促进PEG参与聚合成酯的作用.

Abstract

Iron(Ⅲ)acetylacetonate[Fe(aeac)3] was used as catalyst for the ring-opening polymerization of D

L-lactide and copolymerization of D

L-lactide with polyethylene glycol (PEG)．The effects of catalyst content

reaction temperature

polymerization time and D

L-lactide/PEG molar ratio were investigated．It was showed that the polymerization conversion of lactide more than 90％ could be obtained and polylactide (PDLLA) with viscosity-average molecular weight up to 66000 was prepared．Experimental results indicated that the ring-opening polymerization of lactide proceeded via a coordination-insertion mechanism．Analysis by 1H-NMR showed that PEG acted as an initiator participated in initiation of the ring-opening polymerization of lactide

while Fe (acac)3 promoted the esterification of PEG with lactide．The lactide chains grew from both ends of the PEG molecules and ended with hydroxy-terminated lactyl units．

关键词

乙酰丙酮铁DL-丙交酯聚乙二醇开环聚合

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