Hygrothermal stability of dicyanate-novolac epoxy resin blends

The chemical nature of the changes in a cyanate ester-novolac epoxy resin blend caused by hygrothermal ageing and the effects of the residue reaction in the blends on the hygrothermal ageing resistance were studied. The blends with epoxy molar fraction less than 0.5 absorb much less moisture in boil...

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Bibliographic Details
Published in:Polymer degradation and stability 2003-03, Vol.79 (3), p.521-528
Main Authors: Guo, Baochun, Jia, Demin, Fu, Weiwen, Qiu, Qinghua
Format: Article
Language:English
Subjects:
Ageing
Applied sciences
Cyanate ester
Exact sciences and technology
Hygrothermal stability
Novolac epoxy
Physical properties
Polymer industry, paints, wood
Properties and testing
Technology of polymers
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Summary:The chemical nature of the changes in a cyanate ester-novolac epoxy resin blend caused by hygrothermal ageing and the effects of the residue reaction in the blends on the hygrothermal ageing resistance were studied. The blends with epoxy molar fraction less than 0.5 absorb much less moisture in boiling water than does the homopolymer of the cyanate ester. The moisture uptake of the blend decreases with the extent of cure. The results from dynamic mechanical thermal analysis (DMTA) and Fourier transform infrared spectroscopy (FTIR) indicate that the blends possess superior hygrothermal stability compared to homopolycyanate. The results also indicate that the long-term hygrothermal ageing may cause substantial changes in the chemical nature of the blend when the cure extent is not sufficiently high.
ISSN:0141-3910
1873-2321
DOI:10.1016/S0141-3910(02)00368-3