Yeon Sun-Hwa, Kim Ki-Sub, Choi Sukjeong, Cha Jong-Ho, Lee Huen
Department of Chemical and Biomolecular Engineering, KAIST, Daejeon 305-701, Republic of Korea.
J Phys Chem B. 2005 Sep 29;109(38):17928-35. doi: 10.1021/jp053237w.
Poly(vinylidenefluoride)-hexafluoropropylene (PVdF(HFP))-ionic liquid gel electrolytes were prepared using ionic liquids based on 1-(2-hydroxyethyl)-3-methyl imidazolium tetrafluoroborate and 1-(2-hydroxyethyl)-3-methyl imidazolium hexafluorophosphate. A conventional metathesis reaction was used to prepare these ionic liquids, which have high purity and exhibit a liquid state at room temperature. The prepared polymer-ionic liquid gel proved to be a free-standing and rubbery film in which the degree of transparency differed according to the ratio and type of ionic liquid used. TGA and FTIR analyses confirmed that the solvent, N,N-Dimethylacetamide (DMAC), used for mixing PVdF(HFP) polymer with ionic liquid was almost totally removed during the gelling and drying processes. SEM photographs were taken of the surface structure of the PVdF(HFP)-ionic liquid gel in order to evaluate the morphology of the film's surface according to the mixing ratio and the nature of the ionic liquid. The thermal behaviors of PVdF(HFP)-ionic liquid gels were observed to be similar to those of neat ionic liquids through DSC analysis, and the compatibility between the polymer and ionic liquid was investigated by XRD analysis. The ionic conductivities of all the gels were 10(-3)-10(-5) S cm(-1) in a temperature range of 20-70 degrees C.
使用基于1-(2-羟乙基)-3-甲基咪唑四氟硼酸盐和1-(2-羟乙基)-3-甲基咪唑六氟磷酸盐的离子液体制备了聚偏氟乙烯-六氟丙烯（PVdF(HFP)）-离子液体凝胶电解质。采用常规复分解反应制备这些离子液体，它们具有高纯度且在室温下呈液态。所制备的聚合物-离子液体凝胶被证明是一种自立的橡胶状薄膜，其透明度根据所用离子液体的比例和类型而有所不同。热重分析（TGA）和傅里叶变换红外光谱分析（FTIR）证实，用于将PVdF(HFP)聚合物与离子液体混合的溶剂N,N-二甲基乙酰胺（DMAC）在凝胶化和干燥过程中几乎完全被去除。拍摄了PVdF(HFP)-离子液体凝胶的表面结构的扫描电子显微镜（SEM）照片，以便根据混合比例和离子液体的性质评估薄膜表面的形态。通过差示扫描量热法（DSC）分析观察到PVdF(HFP)-离子液体凝胶的热行为与纯离子液体的热行为相似，并通过X射线衍射（XRD）分析研究了聚合物与离子液体之间的相容性。在20至70摄氏度的温度范围内，所有凝胶的离子电导率为10^(-3)-10^(-5) S cm^(-1)。
