本研究引入團聯共聚物 (block copolymer) 的概念，將高分子以原子轉移自由基聚合反應 (ATRP, Atom Transfer Radical Polymerization) 分兩階段聚合：第一段是聚合 styrene而得到poly(styrene)-Br，第二段則是聚合帶有咪唑鹽 (imidazolium group) 的 [VBMI][BF4] (1-(4-vinylbenzyl)-3-methyl-imidazolium tetrafluoroborate) 而得到團聯共聚物 poly(styrene-b-[VBMI][BF4])。藉由調控第二段 [VBMI][BF4] 的聚合時間而得到不同長度的親水端。此系列高分子薄膜在常溫去離子水中導電度最高有 0.074 S/cm，在 1M KOH 水溶液中導電度最高則有 0.107 S/cm 的表現，有望可應用在固態鹼性燃料電池當中。The hydroxide-conducting block copolymer membranes were synthesized by two steps. Firstly, atom transfer radical polymerization (ATRP) of styrene gave poly(styrene)-Br as a macroinitiator. Secondly, poly(styrene-b-[VBMI][BF4]) were synthesized by ATRP using the above macroinitiator with [VBMI][BF4], 1-(4-vinylbenzyl)-3-methyl- imidazolium tetrafluoroborate. Via controling the reaction time and temperature of the second ATRP, different ratio (hydrophobic block and hydrophilic block) of block copolymers were synthesized. At room temperature, the highest conductivity of the membranes can reach up to 0.074 S/cm (under DI H2O) and 0.107 S/cm (under 1M KOH solution). The results exhibit these block ionomeric membranes are potential new type anion exchange membranes in SAFCs (solid alkline fuel cells).
