IR analysis of polyvinylidene fluoride doped with transition metal halides

Somia M. El Hefnawy; Mervet M. Aboelkher; H. Abdelkader

doi:10.1117/12.820521

22 May 2009 IR analysis of polyvinylidene fluoride doped with transition metal halides

Somia M. El Hefnawy, Mervet M. Aboelkher, H. Abdelkader

Proceedings Volume 7378, Scanning Microscopy 2009; 73780T (2009) https://doi.org/10.1117/12.820521
Event: SPIE Scanning Microscopy, 2009, Monterey, California, United States

Abstract

Pure and doped polyvinylidene fluoride (PVDF) films were prepared by casting. Films with various concentrations of transition metal halides TMHs (AlCl₃, ZnCl₂, and CoCl₂) were prepared. The microstructure and physical properties of these films were studied by IR analysis. The two factors affecting the interaction between the PVDF and MHs are (i) the dopant weight fraction (H_c) (0.05% -30%) by weght, and (ii) precasting time (t_pc) which is the time during which the PVDF pellets are maintained solved with the halides added before casting. From the IR quantitative analysis, it is evident that the addition of the three MH to the undoped PVDF film makes β-phase as the dominant crystalline structures in the doped films without the need for mechanical drawing treatment. The precasting time plays a role for new crystalline structures to appear which becomes strong for CoCl₂ doping, moderate in ZnCl₂ doping and weak in AlCl₃ doping. This phase is maximum for the relatively low doping levels < 5%. The stability of these structures in the samples doped with CoCl₂ is high compared to the doping with ZnCl₂ and AlCl₃. This result is extremely important hence the β-phase is that one which is electrically active compared with the other two phases and it is needed in all the samples used in the useful applications of the PVF₂ films. Remembering, that β-phase is obtained in the crystallization from melt samples by the uneasy mechanical stress and elevated temperature, it becomes evident the importance of the present result.

Citation Download Citation

Somia M. El Hefnawy, Mervet M. Aboelkher, and H. Abdelkader "IR analysis of polyvinylidene fluoride doped with transition metal halides", Proc. SPIE 7378, Scanning Microscopy 2009, 73780T (22 May 2009); https://doi.org/10.1117/12.820521

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