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Received September 17, 2002
Accepted May 29, 2003
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Effect of Evaporation Temperature on the Crystalline Properties of Solution-Cast Films of Poly(vinylidene fluoride)s
Power Source Devices Team, Basic Research Lab., Electronics & Telecommunications Research Institute (ETRI), 161 Gajong, Yusong, Daejeon 305-350, Korea 1Department of Chemistry and Center for Smart Supramolecules, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea
kwang@etri.re.kr
Korean Journal of Chemical Engineering, September 2003, 20(5), 934-941(8), 10.1007/BF02697302
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Abstract
The crystalline properties of poly(vinylidene fluoride) (PVdF) and its copolymer films, prepared from the solvent (N-methyl-2-pyrrolidone) evaporation at different temperatures and subsequent slow cooling to ambient temperature, were investigated by using polarized optical microscopy, differential scanning calorimetry, wide-angle Xray diffractometry, and Fourier-transform infrared spectroscopy. The results can provide helpful data for determining the optimal processing conditions of PVdFs as the polymer binder materials in making the electrodes of rechargeable_x000D_
lithium batteries. The morphology analysis gives useful information that the residual solvent remaining after the evaporation shows distinguishable amounts with respect to the temperature regions dividing by the crystallization (Tc) and melting (Tm) points of original PVdF samples. It is also proved that smallest spherulitic state coexisting with dominant α- and minor γ-phase crystals, simultaneously showing the lowest heat of fusion (e.g., the lowest crystallinity), can be obtained when the solvent is evaporated at a temperature between Tc and Tm. Letting the minor γ-phase crystals exist by controlling the evaporation temperature like this can be one of the best drying (evaporation) conditions of PVdFcontaining slurry in lithium rechargeable battery system.
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References
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