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A deep investigation into the thermal degradation of urethane dimethacrylate polymer

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Abstract

This work investigates in depth the thermal degradation process of a polymer of urethane dimethacrylate (UDMA). UDMA monomer has been widely used in dental restorations and biomaterials. The use of density functional theory (DFT) calculations provided the bases for understanding the structure and reactivity of the UDMA monomer. Simultaneous thermogravimetry–differential thermal analysis, Photovisual Differential Scanning Calorimetry, and mid-infrared spectroscopy (MIR) were used to examine the depolymerization and degradation process. Non-isothermal kinetics made it possible to determine the best fit (n-dimensional nucleation according to Avrami–Erofeev followed by two competitive processes: nth order with autocatalysis by-product and reaction of nth order). Furthermore, the UDMA-P lifetime (5%) was calculated to show a degradation time of 3 years at 100.0 °C. Notwithstanding, techniques such as MIR and nuclear magnetic resonance 13C, 1H linked to DFT calculations helped to elucidate the cleavage positions and possible degradation by-products of UDMA degradation.

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Acknowledgements

The authors wish to thank CAPES (Grants. 024/2012 Pro-equipment), POSMAT/UNESP, São Paulo State Foundation—FAPESP (Grants 2017/08820-8, 2018/03460-6, 2015/00615-0, 2016/01599-1, and 2018/14506-7), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (Grants. 302769/2018-8 and 301857/2018-0).

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  1. School of Sciences, Chemistry Department, UNESP - São Paulo State University, Bauru, SP, 17033-260, Brazil

    Rafael Turra Alarcon, Caroline Gaglieri, Giovanny Carvalho dos Santos, Juan Carlos Roldao, Aroldo Geraldo Magdalena, Luiz Carlos da Silva-Filho & Gilbert Bannach

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  1. Rafael Turra Alarcon
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Alarcon, R.T., Gaglieri, C., dos Santos, G.C. et al. A deep investigation into the thermal degradation of urethane dimethacrylate polymer. J Therm Anal Calorim 147, 3083–3097 (2022). https://doi.org/10.1007/s10973-021-10610-y

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