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Novel cycloaliphatic epoxy resins. II. Curing reaction with BF 3 MEA and its cured properties
Author(s) -
Tokizawa Makoto,
Okada Hiroyoshi,
Wakabayashi Nobukatsu
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070500515
Subject(s) - epoxy , curing (chemistry) , flexural strength , materials science , thermal stability , composite material , elongation , polymer chemistry , ultimate tensile strength , chemistry , organic chemistry
The BF 3 MEA curing reaction and the cured properties of novel cycloaliphatic epoxy resins (CE‐resins), which were derived from an octadienyl compound, were studied. Gelation time and the DSC scan of the CE resins, with BF 3 MEA hardener, proved that the reactivity of the CE resins is intermediate among the reactivities of the conventional resins; it was found that the CE resins react faster than DGEBA, but slower than the conventional cycloaliphatic epoxy resins. The pot life of the CE‐ (III) resin with BF 3 MEA hardener proved to be over 30 days at a temperature of 20°C. The thermal properties are affected by the amount of BF 3 MEA used and the curing conditions. CE‐(III) showed the highest HDT of over 200°C with 2–3 phr of BF 3 MEA. The flexural properties of CE‐(I) proved to be flexible and tough. CE‐(II) exhibited the highest strength and elongation, while CE‐(III) had the same flexural properties as DGEBA. Furthermore, the blending of CE‐(II) with DGEBA produced greater flexural strength and greater elongation than each original resin had. The thermal stability at elevated temperature and the water resistance of the cured CE resins proved to be inferior to those of DGEBA and novolac epoxy resin, probably due to the use of BF 3 MEA. These results suggest the CE resin will provide a new application for a one‐component curing system for composites. © 1993 John Wiley & Sons, Inc.