RING-OPENING POLYMERIZATION OF LACTONE BY RARE EARTH COMPOUNDS Ⅱ. SYNTHESIS OF POLY(D. L-LACTIDE) CATALYZED WITH RARE EARTH ISOPROPOXIDES

SHEN You-qing; ZHANG Fu-yao; ZHANG Yi-feng; SHEN Zhi-quan

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RING-OPENING POLYMERIZATION OF LACTONE BY RARE EARTH COMPOUNDS Ⅱ. SYNTHESIS OF POLY(D. L-LACTIDE) CATALYZED WITH RARE EARTH ISOPROPOXIDES

Research Article | 更新时间：2021-03-19

- RING-OPENING POLYMERIZATION OF LACTONE BY RARE EARTH COMPOUNDS Ⅱ. SYNTHESIS OF POLY(D. L-LACTIDE) CATALYZED WITH RARE EARTH ISOPROPOXIDES
- Acta Polymerica Sinica Issue 2, Pages: 222-227(1995)
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- Published：20 April 1995，
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SHEN You-qing, ZHANG Fu-yao, ZHANG Yi-feng, SHEN Zhi-quan. RING-OPENING POLYMERIZATION OF LACTONE BY RARE EARTH COMPOUNDS Ⅱ. SYNTHESIS OF POLY(D. L-LACTIDE) CATALYZED WITH RARE EARTH ISOPROPOXIDES. [J]. Acta Polymerica Sinica (2):222-227(1995)
DOI：

SHEN You-qing, ZHANG Fu-yao, ZHANG Yi-feng, SHEN Zhi-quan. RING-OPENING POLYMERIZATION OF LACTONE BY RARE EARTH COMPOUNDS Ⅱ. SYNTHESIS OF POLY(D. L-LACTIDE) CATALYZED WITH RARE EARTH ISOPROPOXIDES. [J]. Acta Polymerica Sinica (2):222-227(1995) DOI：

摘要

系统地研究了异丙氧基稀土催化Ｄ．Ｌ－两交酯（ＬＡ）开环聚合的规律．实验表明：在甲苯溶剂中，异丙氧基稀土对Ｄ．Ｌ－丙交酯聚合有较高的催化活性，可获得较高的分子量（Ｍη＝４．０×１０４）不同稀土元素的活性次序如下：Ｌａ＞Ｎｄ＞Ｄｙ＞Ｙ．异丙氧基稀土催化Ｄ·Ｌ－两支酯聚合的合适条件为：［ＬＡ］＝１．９５ｍｏｌ／ｌ，［Ｌｎ（Ｏ－ｉ－Ｐｒ）３］＝６．５×１０－３ｍｏｌ／ｌ，甲苯，９０℃，聚合反应速度与单体和催化剂浓度均成一级关系，聚合反应表现活化能为着６７．７ｋＪ／ｍｏｌ．

Abstract

Ring-opening polymerization of D. L-lactide (D.L-LA) have been successfully carried out by using rare earth isopropoxides as catalyst for the first time.The effects of different rare earth isopropoxides different solvents LA/Ln molar ratio time and polymerization temperature on the polymerization reaction were investigated. It was found that the catalytic activity of different rare earth isopropoxides is as follows: La> M>Nd>Dy>Y

and the optium conditions of the ring-opening polymerization of D. L--LA were:[LA]:1.95mol/l

[Ln(OiPr)3]:6.5×10-3mol/l

90℃

toluene. A kinetic study has shown that the polymerization is first order in both monomer and catalyst. The apparent activation energy of the polyme-rization of D.L-LA with La(OiPr)3 is 67.7KJ/mol.

关键词

开环聚合D．L－丙交酯异丙氧基稀土化合物

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