ESR Study on Polyvinylidene Fluoride Doped with Transition Metal Halides

Abstract:

The main goal of this research is studying the crystal structure and formation of both free radicals and trapped space charges in the pure and doped polyvinylidene fluoride (PVDF) films with various concentrations of transition metal halides TMHs (AlCl₃, ZnCl₂, and CoCl₂). Electron Spin Resonance (ESR) was used to detect the existence of free radicals and the probable magnetic interactions between the halide and PVDF. The hyperfine splitting of the ESR was used to study the electronic structure of the existence radicals. Thermally stimulated dielectric response measurements have been made using Frequency Resolved Dielectric Spectroscopy (FRDS). This was useful for studying the formation and trapping of the space charge to enhance the results obtained by ESR. The new crystalline structures and the complex compounds which may be developed due to the chemical reaction between the polymer and the added halides were analysid.

• Periodical: Advanced Materials Research (Volume 428)
• Pages: 94-99
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.428.94
• Online since: January 2012
• Authors: Somia M. El Hefnawy
• Keywords: ESR, Free Radical, Metal Halides, Polyvinylidene Fluoride (PVDF), Precasting Time

References

[1] D. Rollik, S. Bauer, R. Gerhard-Multhaupt, J. Appl. Phys. 85 (1999) 3282–3288.

[2] H.J. Weller, D. Setiadi, T.D. Binnie, Sens. Actuators A 85 (2000) 267–274.

[3] J. Kim, J.K. Ryou, J. Sound Vib. 251 (2002) 395–408.

[4] A.M. Vinogradov, V.H. Schmidt, G.F. Tuthill, Mech. Mater. 36 (2004) 1007–1016.

[5] P.C. Beard, T.N. Mills, Proceedings of SPIE, vol. 3916, 2000, p.100–109.

[6] C.H. Wang, A. Mandelis, J.A. Garcia, Sens. Actuators B 60 (1999) 228–237.

[7] K.M. Kim, N.G. Park, K.S. Ryu, S.H. Chang, Polymer 43 (14) (2002) 3951.

[8] Zhang Shilin, Fan Zijuan; J; Engineering Plastics Application; 2005-04.

[9] S. M. El Hefnawy, M. Aboelkher,  Proc. of SPIE, Vol 7378, pp. 73780U-73780U-8 (2009).

[10] S. M. El Hefnawy, M. Aboelkher, Proc. of SPIE, Vol. 7378, pp. 73780T-73780T-11 (2009).

[11] H. -Klaus Roth, Detlev Leopold, Wiley, Vol 18 Issue 1, (1988).

[12] B. Ranby, J. F. Rabok, ESR Spectroscopy in polymer, Springer – V. Berline Heidelberg, (1977).

[13] D. J. E. Ingram, Free radicals as studied by electron spin, Butterworth LTD., (1958).

[14] R. E. Florin, L. A. Wall, and J. Che. Phys., 57, p.1791, (1972).

[15] N. Tamura, K. Shinohara, Rep. Progr. Polym. Phys., Japan 6, 265, (1963).

[16] K. P. Homewood and R. P. Benyon, J. Phys. E: Sci. Instrum., 21, p.1022, (1988).

[17] N. R. Lerner, J. Polym Sci., Polym. Chem Ed., 12, p.2477, (1974).

[18] M.A. Bachmann, W. L. Gordon, and J. B. Lando, J. Appl. Phys., 50, p.6101, (1979).

[19] D. K. Das-Gupta, K. Doughty, Ann. Rep. Conf. Elec. Insul. Diel. Phen., 48, p.456, (1979).

[20] F. Gerson, High resolution ESR spectroscopy, Verlag Chemie Gmbh, Wiley&Sons LTD., (1970).