An experiment for the calculation of the degree of double bond conversion, after a polymerization reaction, of photopolymerizable liquid monomers using FTIR-ATR spectroscopy is reported. The experiment was successfully conducted with undergraduate students in materials engineering during the Fundamentals of Polymeric Material course. Students synthesized a Bis-GMA and TEGDMA copolymer through radical chain polymerization using visible light as the energy source (photopolymerization). Through the quantitative analysis of two absorption bands in the FTIR spectra of the monomer and the polymer, the νCC of the alkene group at 1638 cm −1 and the νCC of the aromatic ring at 1610 cm −1 , students calculated the degree of double bond conversion after the polymerization reaction. Students acquired competencies in the synthesis and qualitative and quantitative characterization of polymeric materials through FTIR spectroscopy.

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Biopolymers have undergone growing development in the last twenty‐five years because of their important applications in several areas of medicine. Monomers Bis‐GMA and MMA are widely used in either the teeth restoration or complete substitution, respectively. This work reports the design and synthesis of allyl‐3,5 bis(((allyloxy)carbonyl)oxy)benzoate (35DACBzA) and its evaluation as an eluent for Bis‐GMA in dental resin composites and as a crosslinking agent for MMA. The resin formulated with monomer 35DACBzA showed polymerization shrinkage 40% lower than control. Besides, it presented a degree of conversion 27% greater, water sorption 53% lower, and solubility 80% lower than the composite resin used as control. When 35DACBzA monomer was used as MMA crosslinker, copolymer showed a thermal stability 100 degrees greater than the MMA homopolymer. This proves that monomer 35DACBzA may be used as an eluent for Bis‐GMA in the formulation of dental resin composites with a high degree double bond conversion, less polymerization shrinkage, and less aqueous sorption as well as a crosslinking agent for methacrylic polymers with greater thermal stability. POLYM. COMPOS., 39:E342–E350, 2018. © 2017 Society of Plastics Engineers

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