{"title":"Effect of Gamma Irradiation on the Crystalline Structure of Poly(Vinylidene Fluoride)","authors":"Adriana Souza M. Batista, Cl\u00e1ubia Pereira, Luiz O. Faria","volume":110,"journal":"International Journal of Materials and Metallurgical Engineering","pagesStart":148,"pagesEnd":152,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10003462","abstract":"The irradiation of polymeric materials has received
\r\nmuch attention because it can produce diverse changes in chemical
\r\nstructure and physical properties. Thus, studying the chemical and
\r\nstructural changes of polymers is important in practice to achieve
\r\noptimal conditions for the modification of polymers. The effect of
\r\ngamma irradiation on the crystalline structure of poly(vinylidene
\r\nfluoride) (PVDF) has been investigated using differential scanning
\r\ncalorimetry (DSC) and X-ray diffraction techniques (XRD). Gamma
\r\nirradiation was carried out in atmosphere air with doses between 100
\r\nkGy at 3,000 kGy with a Co-60 source. In the melting thermogram of
\r\nthe samples irradiated can be seen a bimodal melting endotherm is
\r\ndetected with two melting temperature. The lower melting
\r\ntemperature is attributed to melting of crystals originally present and
\r\nthe higher melting peak due to melting of crystals reorganized upon
\r\nheat treatment. These results are consistent with those obtained by
\r\nXRD technique showing increasing crystallinity with increasing
\r\nirradiation dose, although the melting latent heat is decreasing.","references":"[1] G. Botelho, S. Lanceros-Mendez, A.M. Gon\u00e7alves, V. Sencadas, J.G.\r\nRocha, \u201cRelationship between processing conditions, defects and\r\nthermal degradation of poly(vinylidene fluoride) in the \u03b2-phase\u201d in\r\nJournal of Non-Crystalline Solids, vol. 354, 2008, pp.72-78.\r\n[2] M.M. Nasef, H. Saidi, K.Z.M. Dahlan, \u201cInvestigation of electron\r\nirradiation induced-changes in poly(vinylidene fluoride) films\u201d in\r\nPolymer Degradation and Stability, vol. 75, 2002, pp. 85-92.\r\n[3] Y. Kawano, S. Soares, \u201cX-ray induced degradation of poly(vinylidene\r\nfluoride) films\u201d in Polymer Degradation and Stability, vol.35, 1990,\r\npp.99-104.\r\n[4] E. Adem, J. Rickards, G. Burillo, L. Cota, M. Avalos-Borja, \u201cChanges in\r\npoly-vinylidene fluoride produced by electron irradiation\u201din Radiation\r\nPhysics and Chemistry, vol. 54, 1999, pp. 637-641.\r\n[5] R. Verma, H. Marand, B. Hsiao, \u201cMorphological changes during\r\nsecondary crystallization and subsequent melting in poly(ether ether\r\nketone) as studied by real time amall angle X-ray scattering\u201d in\r\nMacromolecules, vol. 29, 1996, pp. 7767-7775.\r\n[6] M. Bonnet, K.D. Rogausch, J. Petermann, \u201cThe endothermic \u201cannealing\r\npeak\u201d of poly(phenylene sulphide) and poly(ethylene terephthalate)\u201d in\r\nColloid Polymer Science, vol. 277, pp. 513-518.\r\n[7] E. Adem, J. Rickards, E. Mu\u00f1oz, G. Burillo, L. Cota, M. Avalos-Borja,\r\n\u201cChanges in the physical and chemical properties of PVDF irradiated by\r\n4 MeV protons\u201d, in Revista Mexicana de F\u00edsica, vol. 49, 2003, pp. 537-\r\n541.\r\n[8] Z. Zhudi, Y. Wenxue, C. Xinfang, \u201cStudy on increase in crystallinity in\r\n\u03b3 \u2013 irradiated poly(vinylidene fluoride)\u201d in Radiation Physics and\r\nChemistry, vol. 65, 2002, pp. 173 \u2013 176.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 110, 2016"}