Influence of post-curing mode on the composite's physical properties

Oliveira, Dayane Carvalho Ramos Salles de; Souza-Junior, Eduardo José; Coppini, Erick Kamiya; Pietro, Lúcia Trazzi; Araujo, Carla P.; Paulillo, Luís Alexandre Maffei Sartini

doi:10.1016/j.dental.2012.07.121

Cited by 1 publication

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“…As stated by Bagis and Rueggeberg, the amount of unreacted double bonds significantly decreased by heating the cured materials after the light‐curing stage. Many researchers detected improved physical properties as a result of the postcuring heating process, such as enhanced surface hardness, tensile strength, flexural strength, color stability, and glass transition temperature . However, it is very difficult and expensive on an industrial scale to heat the sample in such high temperature.…”

Section: Introductionmentioning

confidence: 99%

The effect of solvent on postcuring in free radical photopolymerization

Zhang

Nie

Muhyodin

et al. 2016

J of Applied Polymer Sci

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During free radical photopolymerization, with an increasing degree of conversion, the viscosity increased and vitrification occurred. The unreacted double bonds had difficulty diffusing to the reactive site in the vitrifying polymer. However, the free radicals generated in the vitrifying matrix could survive for a long time. Thus, the postcuring process occurred. In this study, free radical photopolymerization kinetics of methacrylate with or without solvent was investigated by real‐time FTIR, which was combined with a heating device. Results showed that without solvent, postcuring occurred only by heating at a higher temperature than the glass transition temperature of the polymer. However, with solvent, the postcuring occurred even at room temperature, where only a small amount of solvent was enough to cause postcuring. The lifespan of the free radicals inside the polymer was over 10 h. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44223.

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Section: Introductionmentioning

confidence: 99%