Properties of experimental resins based on synthesized propoxylated bis-GMA with different propionaldehyde ratios

Abstract

The effect of different propionaldehyde ratios on the properties of bis-GMA-based comonomers and copolymers diluted with propoxylated bis-GMA (CH 3 bis-GMA) was evaluated. Five experimental comonomers were prepared combining bis-GMA with CH 3 bis-GMA and propionaldehyde at 0, 2, 8, 16, 24 mol%. Light polymerization was effected with the use of 0.2 wt. (%) each of camphorquinone and N,N-dimethyl-p-toluidine. Resin degrees of conversion (%DC) were evaluated by FT-IR spectrophotometry and T g by Differential Scanning Calorimeter. Complex viscosity (η*), the effect of temperature on η*, and Microhardness (H) for dry and wet samples were also determined. Data were analyzed by Student's t-test, one-way ANOVA and Tukey-Kramer test (α = 0.05). The group with 24 mol% additive had a significant increase in %DC and H, and the lowest comonomer T g and η*. No remarkable variation was noted in copolymers T g s. All resins presented Newtonian behavior of viscosity, which linearly decreased with increased temperature. The η* decreased sigmoidally as the additive ratio increased.

Improving Composite Resin Performance Through Decreasing its Viscosity by Different Methods

“…The same conclusions was reached by Denis et al , 2012 [ 41 ] who evaluated the physical, rheological, and mechanical properties of Bis-GMA diluted with CH3bis-GMA containing 0, 2, 8, 16 and 24 mol% propionaldehyde. It has been reported that the viscosity of propionaldehyde is 3 × 10–5 Pa.s and its incorporation into comonomers significantly lowers the viscosity of CH3bis-GMA-based resins.…”

Hydrophobic composite resins using a novel allylic urethane monomer as additive

“…A spectrum was captured before and after the polymerization process. The degree of conversion was obtained following a method described previously [24] considering the height of the absorption band (% of absorbance) corresponding to the νC=C aliphatic bond at 1638 cm -1 and, as internal standard, the height of the absorption band (% of absorbance) corresponding to the νC=C aromatic bond at 1609 cm -1 . The absorption band attributed to aromatic νC=C vibration was used as an internal reference because its intensity remained unchanged during the polymerization reaction, and hence, the absorbance was the same before and after the polymerization reaction.…”

“…In addition, the use of some additives has been explored to increase the degree of conversion [22], polymerization rate [23], and microhardness [24] of Bis-GMA/TEGDMA based composites. Despite these promising results, the use of additives to improve the properties of these materials does not seem to be widely studied in the scientific literature.…”

Preparation and evaluation of modified bisphenol‐A‐glycidyl methacrylate resin dental adhesive to zirconia

“…[17] Kim et al used the nucleophilic substitution of halogenated hydrocarbons to replace the hydroxyl groups on Bis-GMA with a series of alkoxy structures with different chain lengths. [18][19][20] Therefore, as far as dental composite resin materials are concerned, the problem that needs to be solved is to prepare a resin monomer with high mechanical properties to improve the secondary caries problem in dental restoration. The aim of this study was to modify Bis-GMA by using different proportions of acetyl chloride (Figure 1) to reduce the viscosity of monomers.…”