Photo-crosslinked acrylates degradation kinetics

A series of crosslinked polyurethane acrylate solids with glass transition temperatures ranging from –49 to +65 °C was prepared by photopolymerization of specially formulated solvent-free resins. The kinetics of thermooxidative and thermal (in N 2 ) degradation of these crosslinked acrylate networks...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2009-06, Vol.96 (3), p.715-725
Main Authors: Krongauz, Vadim V., Ling, Michael T. K.
Format: Article
Language:English
Subjects:
Acrylates
Analytical Chemistry
Applied sciences
Calorimetry
Chemical reactions and properties
Chemistry
Chemistry and Materials Science
Crosslinking
Degradation
Density
Diffusion rate
Exact sciences and technology
Inorganic Chemistry
Measurement Science and Instrumentation
Networks
Organic polymers
Physical Chemistry
Physicochemistry of polymers
Polyacrylates
Polymer Sciences
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Summary:A series of crosslinked polyurethane acrylate solids with glass transition temperatures ranging from –49 to +65 °C was prepared by photopolymerization of specially formulated solvent-free resins. The kinetics of thermooxidative and thermal (in N 2 ) degradation of these crosslinked acrylate networks at temperatures ranging from 100 to 400 °C was studied as a function of crosslink density using thermogravimetry. The polyacrylate network degradation rate decreased with the increase of crosslink density, while apparent activation energy of degradation increased. Polyacrylate thermal stability increase with crosslinking was explained by decreased rate of oxygen and volatile products diffusion and/or slowing of depolymerization due to increased radical recombination rate, and decreased chain segments mobility in systems with higher crosslink density.
ISSN:1388-6150
1588-2926
1572-8943
DOI:10.1007/s10973-009-0021-8