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Titolo:
Hygrothermal aging of rubber-modified and mineral-filled dicyandiamide-cured DGEBA epoxy resin. II. Dynamic mechanical thermal analysis
Autore:
Ivanova, KI; Pethrick, RA; Affrossman, S;
Indirizzi:
Univ Strathclyde, Dept Pure & Appl Chem, Glasgow G1 1XL, Lanark, Scotland Univ Strathclyde Glasgow Lanark Scotland G1 1XL G1 1XL, Lanark, Scotland
Titolo Testata:
JOURNAL OF APPLIED POLYMER SCIENCE
fascicolo: 14, volume: 82, anno: 2001,
pagine: 3477 - 3485
SICI:
0021-8995(200112)82:14<3477:HAORAM>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
GLASS-TRANSITION TEMPERATURE; WATER; ENVIRONMENTS; ABSORPTION; DEPRESSION;
Keywords:
epoxy resins; hydration-dehydration cycling; dynamic mechanical thermal analysis; plasticization; microcavity formation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Pethrick, RA Univ Strathclyde, Dept Pure & Appl Chem, Thomas Graham Bldg,295 Cathedral St, Glasgow G1 1XL, Lanark, Scotland Univ Strathclyde Thomas Graham Bldg,295 Cathedral St Glasgow Lanark Scotland G1 1XL
Citazione:
K.I. Ivanova et al., "Hygrothermal aging of rubber-modified and mineral-filled dicyandiamide-cured DGEBA epoxy resin. II. Dynamic mechanical thermal analysis", J APPL POLY, 82(14), 2001, pp. 3477-3485

Abstract

The effects of hydration-dehydration cycling on the dynamic mechanical response of a rubber modified, mineral-filled epoxy resin based on the diglycidyl ether of bisphenol A cured with dicyandiamide are reported. Samples of the resin were aged in both deionized water and 5% w/w NaCl solution at 65 degreesC. A dynamic mechanical thermal analyzer was used to detect the changes in the mechanical spectrum of the material induced by moisture ingress. Water absorbed at weight fractions up to 4.3% caused plasticization of thepolymer matrix, and the measured decrease in the glass transition temperature could be interpreted in terms of the polymer network-diluent theory. Water absorbed at levels >4.3% weight fraction resides in microcavities formed as result of the aging process and did not further affect the dynamic mechanical response of the resin. The dynamic mechanical properties of the material were independent of the previous history of exposure to humidity. In the presence of NaCl, the microcavity growth was prevented and the amount of water absorbed did not exceed 4.1% weight fraction. (C) 2001 John Wiley &Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 14:23:34