Chemorheology and ultimate behavior of epoxy-amine mixtures modified with a liquid oligomer

Citation
B. Aizpurua et al., Chemorheology and ultimate behavior of epoxy-amine mixtures modified with a liquid oligomer, J APPL POLY, 76(8), 2000, pp. 1269-1279
Citations number
52
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science","Material Science & Engineering
Journal title
JOURNAL OF APPLIED POLYMER SCIENCE
ISSN journal
0021-8995 → ACNP
Volume
76
Issue
8
Year of publication
2000
Pages
1269 - 1279
Database
ISI
SICI code
0021-8995(20000523)76:8<1269:CAUBOE>2.0.ZU;2-L
Abstract
Rubber toughening of epoxy resins has been actively studied since the 1960s with clear progress in understanding of the ultimate properties: microstru cture relationships. The morphology, obtained after curing of the modified thermosetting matrix, is a function of the process conditions as well as of the materials used because both influence the thermodynamics and the kinet ics of phase separation. In this work several amounts of poly(oxypropylentr iamine) (POPTA), have been added as modifier to a diglycidyl ether of bisph enol-A (DGEBA)-based epoxy matrix cui ed with a cycloaliphatic amine. Molec ular weight of the neat resin and amine/epoxy stoichiometric ratio have als o been used as variables. This investigation has focused upon the importanc e of cure chemorheology for microstructure formation by using both physicoc hemical (isothermal and dynamic calorimetry) and rheological techniques. In the second part of this study, the influence of the molecular weight of th e epoxy resin in the ultimate properties of 15 wt % POPTA-modified epoxy ma trices is also analyzed. (C) 2000 John Wiley & Sons, Inc.