Thermal degradation and isoconversional kinetic analysis of light-cured dimethacrylate copolymers

Thermal degradation kinetics of copolymers based on bis-phenol A ethoxylated dimethacrylate (Bis-EMA) with triethylene glycol dimethacrylate (TEGDMA), and urethane dimethacrylate (UDMA) with TEGDMA in wt/wt ratios 30/70, 50/50, or 70/30 were investigated using thermogravimetric analysis as a means t...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2010-03, Vol.99 (3), p.917-923
Main Authors: Achilias, Dimitris S., Karabela, Maria M., Sideridou, Irini D.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Applied sciences
Chemical reactions and properties
Chemistry
Chemistry and Materials Science
Conversion
Copolymers
Degradation
Exact sciences and technology
Inhomogeneities
Inorganic Chemistry
Measurement Science and Instrumentation
Organic polymers
Physical Chemistry
Physicochemistry of polymers
Polymer Sciences
Polymers
TEGDMA
Thermal degradation
Triethylene glycol dimethacrylate
Urethanes
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Summary:Thermal degradation kinetics of copolymers based on bis-phenol A ethoxylated dimethacrylate (Bis-EMA) with triethylene glycol dimethacrylate (TEGDMA), and urethane dimethacrylate (UDMA) with TEGDMA in wt/wt ratios 30/70, 50/50, or 70/30 were investigated using thermogravimetric analysis as a means to provide specific information regarding the internal structures of these resins. Thermogravimetric scans were taken at four different heating rates to perform an isoconversional analysis to determine the change of the effective activation energy as a function of conversion. A two-step degradation mechanism was found to occur in almost all copolymer compositions attributed to the existence of inhomogeneities in the macromolecular structure and the formation of weak links inside the polymeric network.
ISSN:1388-6150
1588-2926
1572-8943
DOI:10.1007/s10973-009-0526-1