Commenced in January 2007
Paper Count: 30680
Effect of Gamma Irradiation on the Crystalline Structure of Poly(Vinylidene Fluoride)
Abstract:The irradiation of polymeric materials has received much attention because it can produce diverse changes in chemical structure and physical properties. Thus, studying the chemical and structural changes of polymers is important in practice to achieve optimal conditions for the modification of polymers. The effect of gamma irradiation on the crystalline structure of poly(vinylidene fluoride) (PVDF) has been investigated using differential scanning calorimetry (DSC) and X-ray diffraction techniques (XRD). Gamma irradiation was carried out in atmosphere air with doses between 100 kGy at 3,000 kGy with a Co-60 source. In the melting thermogram of the samples irradiated can be seen a bimodal melting endotherm is detected with two melting temperature. The lower melting temperature is attributed to melting of crystals originally present and the higher melting peak due to melting of crystals reorganized upon heat treatment. These results are consistent with those obtained by XRD technique showing increasing crystallinity with increasing irradiation dose, although the melting latent heat is decreasing.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1338778Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1262
 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.
 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.
 Y. Kawano, S. Soares, “X-ray induced degradation of poly(vinylidene fluoride) films” in Polymer Degradation and Stability, vol.35, 1990, pp.99-104.
 E. Adem, J. Rickards, G. Burillo, L. Cota, M. Avalos-Borja, “Changes in poly-vinylidene fluoride produced by electron irradiation”in Radiation Physics and Chemistry, vol. 54, 1999, pp. 637-641.
 R. Verma, H. Marand, B. Hsiao, “Morphological changes during secondary crystallization and subsequent melting in poly(ether ether ketone) as studied by real time amall angle X-ray scattering” in Macromolecules, vol. 29, 1996, pp. 7767-7775.
 M. Bonnet, K.D. Rogausch, J. Petermann, “The endothermic “annealing peak” of poly(phenylene sulphide) and poly(ethylene terephthalate)” in Colloid Polymer Science, vol. 277, pp. 513-518.
 E. Adem, J. Rickards, E. Muñoz, G. Burillo, L. Cota, M. Avalos-Borja, “Changes in the physical and chemical properties of PVDF irradiated by 4 MeV protons”, in Revista Mexicana de Física, vol. 49, 2003, pp. 537- 541.
 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.