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Processing and chemorheology of epoxy resins and their blends with dendritic hyperbranched polymers
journal contribution
posted on 2004-05-05, 00:00 authored by D Ratna, Russell VarleyRussell Varley, G P SimonToughened epoxy systems have found increasing applications in automotive, aerospace, and electronic packaging industries. The present article reported work done for elucidation of gelation and vitrification for various epoxy systems and their blends with dendritic hyperbranched polymers (HBPs) having epoxy and hydroxyl functionality. Gel time was found to increase with increasing functionality from diglycidyl ether of bisphenol A (DGEBA) to tetraglycidyl diaminodiphenyl methane (TGDDM). The vitrification point was clearly identified from rheological experiments for triglycidyl p-amino phenol (TGAP) and TGDDM. In the case of DGEBA a clear display of vitrification was not observed. TGDDM underwent vitrification sooner than did TGAP. Hydroxyl-functionalized HBP reduced the gel time of the blends because of the accelerating effect of -OH groups to the epoxy curing reaction.
History
Journal
Journal of applied polymer scienceVolume
92Issue
3Pagination
1604 - 1610Publisher
WileyLocation
Chichester, Eng.Publisher DOI
ISSN
0021-8995Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2004, Wiley Periodicals, Inc.Usage metrics
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