Dielectric properties of bisphenol-A novolac type epoxide oligomer as a parameter for cure monitoring

Autor:	Noritoshi Ishizaki, Tsuneo Koike
Rok vydání:	1998
Předmět:	Bisphenol A Materials science Diglycidyl ether Polymers and Plastics Epoxide General Chemistry Dielectric Branching (polymer chemistry) Oligomer chemistry.chemical_compound chemistry Polymer chemistry Materials Chemistry Glass transition Curing (chemistry)
Zdroj:	Polymer Engineering & Science. 38:1838-1844
ISSN:	1548-2634 0032-3888
DOI:	10.1002/pen.10353
Popis:	Dielectric properties above the glass transition temperature (T g ) have been investigated for three bisphenol-A novolac type epoxide oligomers (PGEBANs) that have some branching in each molecule in comparison with the diglycidyl ether of bisphenol-A (DGEBA) oligomer without branching. The relationship between the dielectric relaxation time (T) and T g for the branched PGEBAN oligomers is expressed by a modified Williams-Landel-Ferry (WLF) equation taking T g as a variable at fixed temperatures from 70 to 100°C, The WLF-type relationships between T and T g for the two types of uncured epoxide oligomers, the branched PGEBAN and the non-branched DGEBA, were found to be useful for predicting the T g of a branched DGEBA-alicyclic amine system during the middle stage of curing.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::53900731d933d2c195ee751923d37121 https://doi.org/10.1002/pen.10353 Zobrazit plný text záznamu Plný text