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Toughening epoxy resins with polyepichlorohydrin
journal contribution
posted on 1993-05-15, 00:00 authored by M B Jackson, L N Edmond, Russell VarleyRussell Varley, P G WardenPolyepichlorohydrin (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 scienceVolume
48Issue
7Pagination
1259 - 1269Publisher
John Wiley & SonsLocation
Hoboken, N.J.Publisher DOI
ISSN
0021-8995eISSN
1097-4628Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
1993, John Wiley & Sons, Inc.Usage metrics
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