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Hydrolysis and blistering of cyanate ester networks
Author(s) -
Kasehagen Leo J.,
Haury Idelette,
Macosko Christopher W.,
Shimp David A.
Publication year - 1997
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19970404)64:1<107::aid-app9>3.0.co;2-s
Subject(s) - cyanate ester , activation energy , differential scanning calorimetry , materials science , cyanate , isothermal process , hydrolysis , bisphenol a , monomer , polymer chemistry , kinetics , glass transition , composite material , chemistry , epoxy , polymer , organic chemistry , thermodynamics , physics , quantum mechanics
The hydrolysis of a cyanate ester network made from the monomer 2,2′‐bis(4‐cyanatophenyl) isopropylidene (bisphenol A dicyanate homopolymer) was studied. Hydrolysis reactions were performed isothermally at temperatures from 150 to 180°C under conditions of excess water. The kinetics of the reaction were characterized by the decrease in T g as measured by differential scanning calorimetry. The rate of change of T g was found to be adequately described as first order in T g , which is an indirect measure of the concentration of crosslink junctions. The activation energy of the reaction was found to be 115 kJ/mol. In addition, moisture‐conditioned, glass‐reinforced laminate samples were heated and the time to delamination or blistering was recorded as a function of temperature. The blister time at solder temperatures ( T = 220–260°C) was modeled using the above kinetic results. Heat transfer to the laminate was considered and the criteria used for blister time was the time at T = T g of the sample. At lower temperatures ( T < 220°C), loss of water from the laminate is sufficiently fast to prevent blistering. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 107–113, 1997