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Evaluation of postpolymerization as a function of the storage time of triethylene glycol dimethacrylate/2,2‐bis[4‐(2‐hydroxy‐3‐methacryloxy‐prop‐1‐oxy)‐phenyl]propane bisphenyl‐α‐glycidyl ether dimethacrylate copolymers used in dental resins by differential scanning calorimetry and dynamic mechanical analysis
Author(s) -
Rigoli Isabel C.,
Cavalheiro Carla C. S.,
Neumann Miguel G.
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.29431
Subject(s) - triethylene glycol , photopolymer , materials science , copolymer , differential scanning calorimetry , polymer chemistry , ethylene glycol dimethacrylate , fourier transform infrared spectroscopy , monomer , chemical engineering , composite material , polymer , methacrylic acid , physics , engineering , thermodynamics
The aim of this work was to evaluate the effect of the storage time on the thermal properties of triethylene glycol dimethacrylate/2,2‐bis[4‐(2‐hydroxy‐3‐methacryloxy‐prop‐1‐oxy)‐phenyl]propane bisphenyl‐α‐glycidyl ether dimethacrylate (TB) copolymers used in formulations of dental resins after photopolymerization. The TB copolymers were prepared by photopolymerization with an Ultrablue IS light‐emitting diode, stored in the dark for 1–60 days at 37°C, and characterized with differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and Fourier transform infrared spectroscopy with attenuated total reflection. DSC curves indicated the presence of an exothermic peak, confirming that the reaction was not completed during the photopolymerization process. This exothermic peak became smaller as a function of the storage time and was shifted at higher temperatures. In DMA studies, a plot of the loss tangent versus the temperature initially showed the presence of two well‐defined peaks. The presence of both peaks confirmed the presence of residual monomers that were not converted during the photopolymerization process. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009