A new kind of ternary copolymer for ionic conduction

✍ Scribed by Yun-Pu Wang; Yao-Hui Lei; Rong-Min Wang

• Book ID: 101256229
• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 172 KB
• Volume: 73
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19990808)73:6<953::aid-app12>3.0.co;2-g

✦ Synopsis

Two novel ternary copolymers, MNEC-TPC-LDABS and MMEC-TPC-LD-ABS, were synthesized by condensation copolymerization of mannitol-containing oligomeric side chains (MNEC) or melamine-containing oligomeric side chains (MMEC) with terephthaloyl chloride (TPC) and lithium 2,5-diaminobenzene sulfonate (LDABS), respectively, to become thermally stable and mechanically strong ionic conductors. Incorporating anionic groups (SO 3 2Ϫ ) into the structure of copolymers increases mobile cation concentration and introducing MNEC and MMEC enhances ionic conductivity via flexible chain motion assistance. The conductivity () of MNEC-TPC-LDABS is 7.82 ϫ 10 Ϫ5 S/cm and of MMEC-TPC-LDABS is 9.17 ϫ 10 Ϫ5 S/cm, both measured at 25°C. The crystallinity and T g of the copolymers were greatly decreased by the incorporation of dendritic macromolecule units of MNEC or MMEC. The temperature dependencies of the ionic conductivity for two polymers show curved Arrhenius plots, which suggest that ionic conduction is closely associated with segmental motion of the polymer hosts. The conductivity of the polymer electrolytes obeys the Williams-Landel-Ferry (WLF) and Vogel-Tammann-Fulcher (VTF) equation.