Curing and characterization of oxazolidone-isocyanurate-ether networks

被引：19

作者：

Flores, Marjorie ^{[2
]}

Fernandez-Francos, Xavier ^{[1
]}

Morancho, Josep M. ^{[1
]}

Serra, Angels ^{[2
]}

Ramis, Xavier ^{[1
]}

机构：

[1] Univ Politecn Cataluna, Dept Maquines & Motors Term, Lab Termodinam, ETSEIB, E-08028 Barcelona, Spain

[2] Univ Rovira & Virgili, Dept Quim Analit & Quim Organ, Tarragona 43007, Spain

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2012年 / 125卷 / 04期

关键词：

epoxy resins; isocyanurate; oxazolidone; curing of polymers; networks; CATIONIC COPOLYMERIZATION; TERTIARY-AMINES; DIISOCYANATE; TEMPERATURE; DIEPOXIDE; POLYMERS; KINETICS; DGEBA; BULK;

D O I：

10.1002/app.35504

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Oxazolidone-isocyanurate-ether networks were prepared by copolymerization of mixtures of DGEBA and toluene-2,4-diisocyanate (TDI) in presence of benzyldimethylamine (BDMA) as catalyst. Changes during curing and final properties of the cured materials were investigated by using DSC, FTIR/ATR, TMA, DMTA, TGA, and densitometry. The influence of the molar ratio of isocyanate to epoxide groups on the properties and curing were studied. The kinetics of curing was analyzed by means of an integral isoconversional nonisothermal procedure. The fractions of oxazolidone, isocyanurate, and ether groups present in the final network were evaluated and were found to be dependent on the initial isocyanate/epoxy ratio and curing conditions. By increasing the initial proportion of isocyanate the glass transition temperature, the thermal stability, the shrinkage, and the amount of isocyanurate rings increase, whereas the fraction of ether linkages and oxazolidones decreases. It was observed that the gelation is controlled by the formation of isocyanurate rings at the beginning of the curing. (C) 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

引用

页码：2779 / 2789

页数：11

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