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Ali Bahader,Yunsheng Ding,Haoguan Gui,Yu Li,Pei Xu 한국고분자학회 2015 Macromolecular Research Vol.23 No.3
The special electric properties of the poly(vinylidene fluoride) (PVDF) is strongly dependent on its crystallinestructural morphology. In this study, modification in the crystal structure of PVDF was achieved by utilizingthe long alkyl chain ionic liquid (1-hexadecyl-3-methylimidazolium bromide, [C16mim][Br]) and ionic liquid modifiedmultiwalled carbon nanotubes (MWCNT). The developed crystal pattern was analyzed by XRD and the compatibilityand dispersion characteristics of MWCNT in the matrix was observed by FESEM. The isothermal and non-isothermalcrystallization kinetics were studied by DSC and different models namely; Avrami, Jeziorny and Ozawa were appliedto fit the data. The results demonstrate that crystal structure of PVDF is significantly changed and the dispersion ofMWCNT was enhanced with the addition of ionic liquid (IL). Kinetically, the crystallization was influenced andbecame fast due to the presence of [C16mim][Br] at the PVDF/MWCNT interface. Furthermore, the data well fittedin the model with significant linearity. The positive effect on the crystallization of PVDF may be ascribed to not onlydue to the existence of π-cation interaction between the imidazolium cation and the aromatic multiwall carbon nanotubesstructure, but also due to the electrostatic interaction between the > CF2 of the polymer backbone and imidazoliumcation, which speed up the crystallization kinetics.
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