Hydrolysis kinetics of condensation polymers under humidity aging conditions

The hydrolytic stability of polycarbonate (PC), poly(ethylene terephthalate) (PET), and resorcinol polyarylate (RPA) films was studied at 65–95 °C and 23–95% relative humidity (RH) by measuring the time to embrittlement as measured by a bending test on films. The data show that the hydrolysis of the...

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Bibliographic Details
Published in:Polymer degradation and stability 2013-07, Vol.98 (7), p.1311-1320
Main Authors: Pickett, James E., Coyle, Dennis J.
Format: Article
Language:English
Subjects:
activation energy
Ageing
Applied sciences
Bend tests
condensation
Embrittlement
ethylene
Exact sciences and technology
Humidity
Hydrolysis
Hydrothermal
PET
Physical properties
Polyarylate
Polycarbonate
Polycarbonates
Polyester
Polyethylene terephthalates
Polymer industry, paints, wood
Properties and testing
Relative humidity
resorcinol
Stability
Technology of polymers
temperature
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Summary:The hydrolytic stability of polycarbonate (PC), poly(ethylene terephthalate) (PET), and resorcinol polyarylate (RPA) films was studied at 65–95 °C and 23–95% relative humidity (RH) by measuring the time to embrittlement as measured by a bending test on films. The data show that the hydrolysis of these polymers is second order in RH with overall kinetics 1/tfail = A exp(-Ea/RT) [RH]2 where tfail is the embrittlement time in days, R is the gas constant, T is the temperature in kelvins, and RH is the fractional relative humidity. The activation energy, Ea, in kJ/mol and ln(A), respectively, for the polymers were PC: 92, 24.9; PET: 129, 39.3; RPA: 102, 30.0.
ISSN:0141-3910
1873-2321
DOI:10.1016/j.polymdegradstab.2013.04.001