LIVING RING-OPENING POLYMERIZATION OF L,L-LACTIDE INITIATED WITH POTASSIUM TERT-BUTOXIDE AND ITS 18-CROWN-6 COMPLEX

被引：23

作者：

SIPOS, L ^{[1
]}

ZSUGA, M ^{[1
]}

KELEN, T ^{[1
]}

机构：

[1] LAJOS KOSSUTH UNIV,INST APPL CHEM,H-4010 DEBRECEN,HUNGARY

来源：

POLYMER BULLETIN | 1992年 / 27卷 / 05期

关键词：

D O I：

10.1007/BF00300596

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Living polymerization of L,L-lactide initiated by potassium t-butoxide and its 18-crown-6 complex was investigated in THFBAR solution at room temperature. The results support a reversible polymerization mechanism consisting of first order in monomer propagation and of unimolecular depropagation. The presence of 18-crown-6 has a strong MWD narrowing effect (Mw/Mn < 1.2), slows down the overall rate of polymerization and gives rise to slow initiation. The polymerizations yield optically pure polymers both in the presence and absence of 18-crown-6.

引用

页码：495 / 502

页数：8

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