Copolymerizations of ε-caprolactone and glycolide -: A comparison of tin(II)octanoate and bismuth(III)Subsalicylate as initiators

被引:30
|
作者
Kricheldorf, HR [1 ]
Rost, S [1 ]
机构
[1] Univ Hamburg, Inst Tech & Makromol Chem, Bundesstr 45, D-20146 Hamburg, Germany
关键词
D O I
10.1021/bm040070o
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Copolymerizations of c-caprolactone (epsilon CL) and glycolide (GL) were conducted in bulk at 120 degrees C with variation of the reaction time. Either Sn(II) 2-ethylhexanoate (SnOct(2)) or bismuth(III) sub salicylate (BiSS) were used as initiators combined with tetra(ethylene glycol) as co-initiator. The resulting copolyesters were analyzed by H-1 and C-13 NMR spectroscopy with regard to the total molar composition and to the sequence of the comonomers. Furthermore, two series of copolymerizations (either Sn- or Bi-initiated) were performed at constant time with variation of the temperature. It was found that BiSS favors alternating sequences more than SnOct(2). Time-conversion curves and MALDI-TOF mass spectrometry of homopolymerization suggest that SnOct2 is the more efficient transesterification catalyst. A hypothetical reaction mechanism is discussed.
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收藏
页码:1345 / 1352
页数:8
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