Solvent effects on the free-radical copolymerization of butyl acrylate with methyl methacrylate

Fuente, José Luis de la; Madruga, Enrique López

doi:10.1002/(sici)1521-3935(19990701)200:7<1639::aid-macp1639>3.0.co;2-y

Cited by 21 publications

(12 citation statements)

References 20 publications

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“…The influence of the polarity of the reaction medium has been put forward since the first papers on the effect of solvents on copolymerization parameters were published 1, 4, 5, 22. Thus, two different and opposite trends, as a function of the solvent polarity, also have been observed for MMA/BA copolymerizations performed in benzene or benzonitrile 29. Furthermore, the effect of solvent polarity on the local monomer concentration has been noted when 2‐hydroxyethyl methacrylate is copolymerized with S in solvents with a low dipole moment (toluene) or with a high dipole moment ( N , N ′‐dimethylformamide) 30.…”

Section: Resultsmentioning

confidence: 99%

Solvent effects on the free-radical copolymerization of styrene with butyl acrylate. I. Monomer reactivity ratios

Fernández-Sanz

Madruga

Cuervo-Rodríguez

et al. 2000

J. Polym. Sci. A Polym. Chem.

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The free‐radical copolymerization of styrene with butyl acrylate was carried out in benzene and benzonitrile at 50°C. Differences between the apparent reactivity ratios determined in this work and those previously reported in bulk indicated noticeable solvent effects. This is explained by a qualitative bootstrap effect. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 60–67, 2000

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Section: Resultsmentioning

confidence: 99%

Solvent effects on the free-radical copolymerization of styrene with butyl acrylate. I. Monomer reactivity ratios

Fernández-Sanz

Madruga

Cuervo-Rodríguez

et al. 2000

J. Polym. Sci. A Polym. Chem.

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“… 23 By applying heat to the silane agent, the solvent of the agent sufficiently evaporates, increasing the chemical responsiveness of the silane coupling agent. 24 For dental applications, several previous studies have already used the heat activation technique and evaluated its effectiveness on the bonding of fiber posts to resin composites. For example, Monticelli et al 21 concluded that drying at a high temperature (38℃) may facilitate the evaporation of solvents in silane agents, eventually improving the bonding strength of the dual-cure composite resin to the fiber post (the study used D.T.…”

Section: Discussionmentioning

confidence: 99%

Effects of hydrogen peroxide pretreatment and heat activation of silane on the shear bond strength of fiber-reinforced composite posts to resin cement

et al. 2016

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PURPOSETo evaluate the effects of hydrogen peroxide pretreatment and heat activation of silane on the shear bond strength of fiber-reinforced composite posts to resin cement.MATERIALS AND METHODSThe specimens were prepared to evaluate the bond strength of epoxy resin-based fiber posts (D.T. Light-Post) to dual-curing resin cement (RelyX U200). The specimens were divided into four groups (n=18) according to different surface treatments: group 1, no treatment; group 2, silanization; group 3, silanization after hydrogen peroxide etching; group 4, silanization with warm drying at 80℃ after hydrogen peroxide etching. After storage of the specimens in distilled water at 37℃ for 24 hours, the shear bond strength (in MPa) between the fiber post and resin cement was measured using a universal testing machine. The fractured surface of the fiber post was examined using scanning electron microscopy. Data were analyzed using one-way ANOVA and post-hoc analysis with Tukey's HSD test (α=0.05).RESULTSSilanization of the fiber post (Group 2) significantly increased the bond strength in comparison with the non treated control (Group 1) (P<.05). Heat drying after silanization also significantly increased the bond strength (Group 3 and 4) (P<.05). However, no effect was determined for hydrogen peroxide etching before applying silane agent (Group 2 and 3) (P>.05).CONCLUSIONFiber post silanization and subsequent heat treatment (80℃) with warm air blower can be beneficial in clinical post cementation. However, hydrogen peroxide etching prior to silanization was not effective in this study.

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“…But, in this study heat treatment after silanization of the post was not effective in enhancing bond strength. Silane coupling is a technique-sensitive step, given that incomplete evaporation of the solvent may compromise chemical reactions between silane and the glass or quartz fibers of the post 19. Heat treatment after application of the silane coupling agent is thought to promote complete evaporation of the solvent.…”

Section: Discussionmentioning

confidence: 99%

Effect of silane activation on shear bond strength of fiber-reinforced composite post to resin cement

et al. 2013

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PURPOSEAmong the surface treatment methods suggested to enhance the adhesion of resin cement to fiber-reinforced composite posts, conflicting results have been obtained with silanization. In this study, the effects of silanization, heat activation after silanization, on the bond strength between fiber-reinforced composite post and resin cement were determined.MATERIALS AND METHODSSix groups (n=7) were established to evaluate two types of fiber post (FRC Postec Plus, D.T. Light Post) and three surface treatments (no treatment; air drying; drying at 38℃). Every specimen were bonded with dual-curing resin cement (Variolink N) and stored in distilled water for 24 hours at 37℃. Shear-bond strength (MPa) between the fiber post and the resin cement were measured using universal testing device. The data were analyzed with 1-way ANOVA and by multiple comparisons according to Tukey's HSD (α=0.05). The effect of surface treatment, fiber post type, and the interactions between these two factors were analyzed using 2-way ANOVA and independent sample T-tests.RESULTSSilanization of the FRC Postec Plus significantly increased bond strength compared with the respective non-treated control, whereas no effect was determined for the D.T. Light Post. Heat drying the silane coupling agent on to the fiber-reinforced post did not significantly improve bond strength compared to air-syringe drying.CONCLUSIONThe bond strength between the fiber-reinforced post and the resin cement was significantly increased with silanization in regards to the FRC Postec Plus post. Bond strength was not significantly improved by heat activation of the silane coupling agent.

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Solvent effects on the free-radical copolymerization of butyl acrylate with methyl methacrylate

Cited by 21 publications

References 20 publications

Solvent effects on the free-radical copolymerization of styrene with butyl acrylate. I. Monomer reactivity ratios

Solvent effects on the free-radical copolymerization of styrene with butyl acrylate. I. Monomer reactivity ratios

Effects of hydrogen peroxide pretreatment and heat activation of silane on the shear bond strength of fiber-reinforced composite posts to resin cement

Effect of silane activation on shear bond strength of fiber-reinforced composite post to resin cement

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