Radiation Effects in the PVDF/Graphene Oxide Nanocomposites

Exposure to ionizing radiation has been found to induce changes in poly(vinylidene fluoride) (PVDF) homopolymers. The high dose gamma irradiation process induces the formation of C=C and C=O bonds in its [CH2-CF2]n main chain. The irradiation also provokes crosslinking and chain scission. All these radio-induced defects lead to changes in the PVDF crystalline structure. As a consequence, it is common to observe a decrease in the melting temperature (TM) and melting latent heat (LM) and some changes in its ferroelectric features. We have investigated the possibility of preparing nanocomposites of PVDF with graphene oxide (GO) through the radio-induction of molecular bonds. In this work, we discuss how the gamma radiation interacts with the nanocomposite crystalline structure.

[1] G. Botelho, S. Lanceros-Mendez, A.M. Gonçalves, V. Sencadas, J.G. Rocha, “Relationship between processing conditions, defects and thermal degradation of poly(vinylidene fluoride) in the β-phase” in Journal of Non-Crystalline Solids, vol. 354, 2008, pp.72-78.
[2] M. Celina, T.R. Dargaville, R. A. Assink, J. W. Martín, “Selection and optimization of piezoelectric polyvinylidene fluoride polymers for adaptive optics in space environments” in High Performance Polymers, vol. 17, 2005, pp. 575-593.
[3] R. D. Dreyer, S. Park, C. W. Bielawski, R. S. Ruoff, “The chemistry of graphene oxide” in Chemical Society Reviews, vol. 39, 2010, pp. 228-240.
[4] C. Yu, D. Li, W. Wu, C. Luo, Y. Zhang, C. Pan, “Mechanical property enhancement of PVDF/graphene composite based on a high-quality graphene” in Journal Materials Science, vol. 49, 2014, pp. 8311-8316.
[5] I. Boullier, S. Esnouf, A. L. Moël, “Radiooxidation of fluoropolymers: identification of oxidation products” in “Journal of Polymer Science Part B Polymer Physics, vol. 41, 2003, pp. 1509 – 1517.