Kinetic studies of the degradation of poly (vinyl alcohol)-based proton-conducting membranes at low temperatures
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Data publicació2011-07-10
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Abstract
Thermal decomposition of unmodified poly(vinyl alcohol) (PVA) and poly(vinyl alcohol) crosslinked with
sulfosuccinic acid (SSA) membranes has been studied using thermogravimetry (TGA) and ATR Fourier
transform infrared spectroscopy (ATR-FTIR). Both types of membranes degrade in a two-step process.
However, the introduction of SSA leads to an advance of the decomposition steps at very low temperatures.
The reduction in the hydrogen-bond interactions of hydroxyl groups of unmodified PVA because
of the presence of SSA crosslinks and the catalytic effect promoted by sulfonic acid group (–SO3H) of SSA
can contribute to this different behavior.
The kinetics of thermal degradation was investigated by TGA and derivative TGA (DTGA) curves from
experiments under non-isothermal conditions at different heating rates. The Friedman isoconversional
differential method was used to calculate the activation energy as a function of the reaction weight loss
without any previous assumption on the kinetic model. For a representative stage of decomposition, preexponential
factor and kinetic model were also obtained. Postcuring isothermal treatments and ATR-FTIR
analysis of selected membranes have been used to verify the TGA analysis and add additional information.
CitacióMorancho, J. [et al.]. Kinetic studies of the degradation of poly (vinyl alcohol)-based proton-conducting membranes at low temperatures. "Thermochimica acta", 10 Juliol 2011, vol. 521, núm. 1-2, p. 139-147.
ISSN0040-6031
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