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Titolo:
Water absorption in a rubber-modified epoxy resin, carboxy terminated butadiene acrylonitrile-amine cured epoxy resin system
Autore:
McEwan, L; Pethrick, RA; Shaw, SJ;
Indirizzi:
Univ Strathclyde, Dept Pure & Appl Chem, Glasgow G1 1XL, Lanark, Scotland Univ Strathclyde Glasgow Lanark Scotland G1 1XL G1 1XL, Lanark, Scotland DefdEvaluat & Res Agcy, Struct Mat Ctr, Farnborough GU14 6TD, Hants, Englan Def Evaluat & Res Agcy Farnborough Hants England GU14 6TD , Hants, Englan
Titolo Testata:
POLYMER
fascicolo: 15, volume: 40, anno: 1999,
pagine: 4213 - 4222
SICI:
0032-3861(199907)40:15<4213:WAIARE>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHASE-SEPARATION; SORPTION;
Keywords:
rubber-modified epoxy resin; dynamic mechanical thermal analysis; carboxy terminated butadiene acrylonitrile;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Pethrick, RA Univt,trathclyde, Dept Pure & Appl Chem, Thomas Graham Bldg,295 Cathedral S Univ Strathclyde Thomas Graham Bldg,295 Cathedral St GlasgowLanark Scotland G1 1XL
Citazione:
L. McEwan et al., "Water absorption in a rubber-modified epoxy resin, carboxy terminated butadiene acrylonitrile-amine cured epoxy resin system", POLYMER, 40(15), 1999, pp. 4213-4222

Abstract

Gravimetric and dielectric measurements of water uptake by a series of carboxy terminated butadiene acrylonitrile (CTBN) -amine cured epoxy resin systems are reported. The amount of water absorbed and rate of diffusion increases up to approximately 15 w/w% CTBN content. Anomalous behaviour is observed around a composition of approximately 20% CTBN which is coincident withthe occurrence of a co-continuous phase structure in the resin. Dynamic mechanical analysis and atomic force microscopy studies provide evidence for phase separation and inversion of phase structure at 20% CTBN. The increasein the water uptake with increasing CTBN content reflects the ability of the highly polar acrylonitrile group to bind water. The general increase in the diffusion coefficient is consistent with CTBN being initially dispersedin the epoxy matrix tending to a lowering of the effective segment densityinhibiting mobility of the water molecules. In the co-continuous region subtle effects of mutual solubility of components and generation of a long percolation path leads to the observed anomalous behaviour, Dynamic mechanical thermal analysis (DMTA) indicated that water absorption suprisingly leadsto an increase in the glass transition temperature and is associated with a densification of the matrix structure. Atomic force microscopy measurements reveal that the surface roughness changes with composition with a markedincrease in the surface roughness at 20% CTBN. (C) 1999 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 12:22:05