期刊
EUROPEAN POLYMER JOURNAL
卷 45, 期 4, 页码 1282-1292出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2008.11.026
关键词
Epoxy resins; Crosslinking; Thermosets; Cationic polymerization; Calorimetry
资金
- CICYT (Comision Interministerial de Ciencia y Tecnologia)
- FEDER (Fondo Europeo de Desarrollo Regional) [MAT2005-01806, MAT2004-04165-C02-02]
The thermal cationic curing of mixtures in different proportions of diglycidylether of bisphenol A (DGEBA) with gamma-valerolactone (gamma-VL) initiated by scandium, ytterbium and lanthanum triflates or a conventional BF3-MEA initiator was investigated. The non-isothermal differential scanning calorimetry (DSC) experiments at a controlled heating rate were used to evaluate the evolution of the reactive systems. BF3-MEA and rare earth metal triflates initiated curing systems follow a different evolution. Among rare earth metal triflates tested, the scandium was the most active initiator. The phenomenological changes that take place during curing were studied and represented in a time-temperature-transformation (TTT) diagram. Some characteristics of the materials were also evaluated. (c) 2008 Elsevier Ltd. All rights reserved.
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