STUDY OF BULK CHAIN COUPLING REACTIONS .3. REACTION BETWEEN BISOXAZOLINES OR BISOXAZINES AND CARBOXY-TERMINATED OLIGOMERS

被引:48
作者
DOUHI, A [1 ]
FRADET, A [1 ]
机构
[1] UNIV PARIS 06,SYNTH MACROMOLEC LAB,CNRS,URA 24,F-75252 PARIS 05,FRANCE
关键词
CHAIN COUPLING REACTIONS; BISOXAZOLINE; BISOXAZINE; CARBOXY END GROUPS; POLYESTER; POLYAMIDE; BULK REACTION;
D O I
10.1002/pola.1995.080330410
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
2,2'-Bis(2-oxazoline) and 2,2'-bis[5,6-dihydro-(4H)-1,3-oxazine] have been used as chain coupling reagents (CC) and reacted in the bulk with alpha,omega-dicarboxy-poly(2,2'-oxydiethylene adipate) (PS) or with alpha,omega-dicarboxy-polyamide 12 (PA). The reactions have been followed by viscosimetry, titration of COOH groups and H-1- and C-13-NMR spectroscopy. Either with the PS/CC or PA/CC systems, or with the model system dodecanoic acid (DA)/CC, the reactions were fast, since in most cases 80% conversion was reached after 15 min reaction, The expected DA dimer or high molar mass PA or PS polymers were obtained. No significant side reaction has been detected. The thermal stability of the resulting polymers is higher than that of starting oligomers. Due to the introduction of CC units in the chains, the crystallinity of PA/CC is lower than that of starting PA. (C) 1995 John Wiley & Sons, Inc.
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页码:691 / 699
页数:9
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