Phase Behavior and Ionic Conductivity of Lithium Perchlorate-Doped Polystyrene-b-poly(2-vinylpyridine) Copolymer

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• 作者：Sudhakar Naidu ; Hyungju Ahn ; Jinsam Gong ; Bokyung Kim ; Du Yeol Ryu
• 刊名：Macromolecules
• 出版年：2011
• 出版时间：August 9, 2011
• 年：2011
• 卷：44
• 期：15
• 页码：6085-6093
• 全文大小：1078K
• 年卷期：v.44,no.15(August 9, 2011)
• ISSN：1520-5835

文摘

The phase transitions of lithium perchlorate (LiClO₄)- doped polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP) were studied as a function of temperature and ion salt concentration using in situ small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). Incorporation of LiClO₄ into an asymmetric, disordered PS-b-P2VP copolymer produced temperature-dependent order鈥揹isorder (ODT) and order鈥搊rder transitions (OOTs) from spherical to lamellar microphases. The effective interaction parameter (蠂_eff) between two block components was evaluated for low molecular weight LiClO₄-doped PS-b-P2VP in a disordered state. With increasing quantities of LiClO₄, a remarkable increase in 蠂 along with a volumetric change produced by the selective coordination of LiClO₄ to the ionophilic P2VP block led to morphological transitions from disordered (DIS) to body-centered cubic spherical (BCC) to hexagonally packed cylindrical (HEX) to lamellar (LAM) structures. We also demonstrate that the ionic conductivity in the samples quenched from the different structures is morphology-independent, while it increases with increasing salt concentration.