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Studies on blends of epoxy-functionalized hyperbranched polymer and epoxy resin
journal contribution
posted on 2003-01-01, 00:00 authored by D Ratna, Russell VarleyRussell Varley, R K Singh Raman, G P SimonAn epoxy-functionalized hyperbranched polymer (HBP) was used to toughen a conventional epoxy resin, diglycidyl ether of bisphenol A (DGEBA) cured with diethyltoluene-2,6-diamine (DETDA). There was little change in gel time as a result of addition of HBP, even though the HBP reacts at a slower rate with amine hardeners compared to DGEBA alone. Phase separation was investigated for various HBP contents and as a function of cure conditions as well. The thermal and dynamic viscoelastic behavior of the modified matrices have been examined and compared to the DGEBA epoxy matrix. It appears that the HBP which phase separates does not react as fully as when it is reacted with the amine alone. Nonetheless, good improvement in impact strength as a result of incorporation of HBP were observed and explained in terms of morphological behavior for a DGEBA matrix modified with various amounts of HBP.
History
Journal
Journal of materials scienceVolume
38Issue
1Pagination
147 - 154Publisher
SpringerLocation
Berlin, GermanyPublisher DOI
ISSN
0022-2461Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2003, Kluwer Academic PublishersUsage metrics
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