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Thermoanalytical characterization of visible light cure dental composites
Author(s) -
VAIDYANATHAN J.,
VAIDYANATHAN T.K.,
WANG Y.,
VISWANADHAN T.
Publication year - 1992
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.1992.tb01590.x
Subject(s) - materials science , composite material , thermogravimetric analysis , differential scanning calorimetry , thermal decomposition , thermal expansion , composite number , exothermic reaction , decomposition , thermomechanical analysis , curing (chemistry) , thermal analysis , thermal , chemistry , thermodynamics , physics , organic chemistry
Summary Selected commercial and experimental composites and resin systems have been evaluated by thermal analysis techniques of Differential Scanning Calorimetry, Thermogravimetric Analysis and Thermomechanical Analysis. Important thermal data such as heat of cure, coefficient of thermal expansion, dimensional changes over selected temperature ranges, filler weight percent, onset temperature of decomposition, temperature of peak decomposition rate, temperature of the end of decomposition, etc. have been determined. Heat of cure, thermal expansion coefficient and dimensional changes appear to follow an inverse linear regression fit with filler fraction in the composite. Thermal expansion changes and exothermic reactions with temperature indicate secondary cure during postcure heating. The thermally‐induced decomposition occurs in multiple stages indicating presence of different structural species in the resin matrix.