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Toughening epoxy resins with polyepichlorohydrin

journal contribution
posted on 15.05.1993, 00:00 authored by M B Jackson, L N Edmond, Russell VarleyRussell Varley, P G Warden
Polyepichlorohydrin (PECH) rubbers were found to toughen epoxy resins based on the diglycidyl ether of bisphenol A (DGEBA) and cured with piperidine. The degree of toughening depends on the molecular weight of the PECH and on the curing temperature. Best toughening was achieved with PECH of the highest nominal molecular weight of 3400 (Hydrin 10 × 2). Hydrin 10 × 1 (nominal molecular weight 1700) did not toughen the epoxy resin unless bisphenol A was also added, whereas Hydrin 10 × 2 toughened it in the absence of bisphenol A. Curing resins containing bisphenol A and Hydrin 10 × 1 at 160°C resulted in a slightly more brittle resin than when cured at 120°C. The effect of PECH rubbers on the T g , modulus, and hot/wet properties is similar to that of carboxy‐terminated butadiene‐acrylonitrile rubbers (CTBN). Dynamic mechanical thermal analysis (DMTA) and scanning electron micrographs (SEM) of fractured surfaces show that the PECH separates as a discrete phase during curing.

History

Journal

Journal of applied polymer science

Volume

48

Issue

7

Pagination

1259 - 1269

Publisher

John Wiley & Sons

Location

Hoboken, N.J.

ISSN

0021-8995

eISSN

1097-4628

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1993, John Wiley & Sons, Inc.