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    Effect of cinnamate comonomers on the dental formulation properties

    Year: 2013

    Journal: Journal of Applied Polymer Science, 2013, 127 (4), pp 2442-2452, 20130926

    Authors: Emil C. Buruiana, Florentina Jitaru, Violeta Melinte, Tinca Buruiana

    Organizations: Photochemistry and Polyaddition Department, Petru Poni Institute of Macromolecular Chemistry, Romanian Academy, Iasi 700487, Romania

    This study reports the synthesis and characterization of two urethane dimethacrylates containing poly(ethylene oxide) orpoly(propylene oxide) segment and cinnamate pendant moieties to be formulated in dental resin composites. 1H NMR, 13C NMR,and Fourier transform infrared spectroscopies, gel permeation chromatography, electrospray ionization-mass spectroscopy, and thermogravimetricmeasurements confirmed their structure, whereas the photopolymerization evolution of oligodimethacrylates relatingto a low–molecular-weight dicinnamate methacrylate under ultraviolet irradiation was investigated by photo-differential scanning calorimeter,monitoring the degree of conversion (DC) and polymerization rate. The photopolymerization results reveal that the investigatedderivatives display a good photoreactivity (DC: 70%) during the formation of crosslinked polymers, the DC depending especiallyon the sample viscosity. The polymerization shrinkage for several mixtures including the urethane oligocinnamates (20 wt %)and diglycidyl methacrylate of bisphenol A/triethyleneglycol dimethacrylate system in the absence of filler was determined, theobtained values being in the range of 6.1–8.2 vol %. For few cured specimens incorporating quartz filler (75 wt %), water sorption/solubility, contact angle, and mechanical parameters were measured to establish if such monomers could be of interest in dentistry.