Characterization of Gamma Irradiated PVDF and PVDF/Graphene Oxide Composites by Spectroscopic Techniques

Authors: Juliana V. Pereira, Adriana S. M. Batista, Jefferson P. Nascimento, Clascídia A. Furtado, Luiz O. Faria

Abstract:

The combination of the properties of graphene oxide (OG) and PVDF homopolymer makes their combined composite materials as multifunctional systems with great potential. Knowledge of the molecular structure is essential for better use. In this work, the degradation of PVDF polymer exposed to gamma irradiation in oxygen atmosphere in high dose rate has been studied and compared to degradation of PVDF/OG composites. The samples were irradiated with a Co-60 source at constant dose rate, with doses ranging from 100 kGy to 1,000 kGy. In FTIR data shown that the formation of oxidation products was at the both samples with formation of carbonyl and hydroxyl groups amongst the most prevalent products in the pure PVDF samples. In the other hand, the composites samples exhibit less presence of degradation products with predominant formation of carbonyl groups, these results also seen in the UV-Vis analysis. The results show that the samples of composites may have greater resistance to the irradiation process, since they have less degradation products than pure PVDF samples seen by spectroscopic techniques.

Keywords: Gamma irradiation, PVDF, PVDF/OG composites, spectroscopic techniques.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1338834

References:

[1] J. Yu, P. Jiang, C. Wu, L. Wang, X. Wu, “Graphene nanocomposites based on poly(vinylidene fluoride): structure and properties” in Polymer Composites, 2011, pp. 1484 – 1490.
[2] 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.
[3] M.M. Nasef, H. Saidi, K.Z.M. Dahlan, “Investigation of electron irradiation induced-changes in poly(vinylidene fluoride) films” in Polymer Degradation and Stability, vol. 75, 2002, pp. 85-92.
[4] C. Yu, D. Li, W. Wu, C. Luo, Y. Zhang, C. Pan, “Mechanical property enhancement of PVDF/grapheme composite based on a high-quality grapheme” in Journal Materials Science, vol. 49, 2014, pp. 8311-8316.
[5] T. Kuilla, S. Bhadra, D. Yao, N. H. Kim, S. Bose, J. H. Lee, “Recent advances in grapheme based polymer composites” in Progress in Polymer Science, vol. 35, 2010, pp. 1350 – 1375.
[6] B. Zhang, L. Li, Z. Wang, S. Xie, Y. Zhang, Y. Shen, M. Yu, B. Deng, Q. Huang, C. Fan, J. Li, “Radiation induced reduction: an effective and clean route to synthesize functionalized graphene” in Journal of Materials Chemistry, vol. 22, 2012, pp. 775 – 7781.
[7] A. S. Medeiros, L. O. Faria, “High gamma dose response of poly(vinylidene fluoride) copolymers”, in Nuclear Instruments and Methods in Physics Research, Section B, Beam Interactions with Materials and Atomis (Print), v. 268, 2010, pp. 2740 – 2743.
[8] F. T. Thema,1 M. J. Moloto,1 E. D. Dikio,1 N. N. Nyangiwe, L. KotsediM. Maaza, M. Khenfouch, “Synthesis and Characterization of Graphene Thin Films by Chemical Reduction of Exfoliated and Intercalated Graphite Oxide”, in Journal of Chemistry, 2013, pp. 1-6.
[9] S. Boullier, A. Esnouf. Le Moël, “Radiooxidation of fluoropolymers: identification of oxidation products”, in Journal of Polymer Science Part B Polymer Physics, vol. 41, 2003, pp. 1509–1517.
[10] Z. Zhudi, Y. Wenxue, C. Xinfang, “Study on increase in crystallinity in γ – irradiated poly(vinylidene fluoride)” in Radiation Physics and Chemistry, vol. 65, 2002, pp. 173 – 176.