Synthesis and Characterization of New Sulfonated Polyimides Containing Heterocyclic Groups for Proton Exchange Membrane Materials

• Main Authors: Mao-Hsing Chiu, 邱茂興
• Other Authors: Yaw-Terng Chern
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/69274846232028460025

碩士 === 國立臺灣科技大學 === 化學工程系 === 97 === Two novel sulfonated diamines of 2,2'-(4,4'-diaminobiphenyl-2,2'-diyl) dibenzothiazole-5-sulfonic acid (TWS) and 2,2'-(4,4'-diaminobiphenyl -2,2'-diyl)dibenzooxazole-5-sulfonic acid (TWO) were systhesized. Sulfonated copolyimides(SPIs) derived from 1,4,5,8-naphthalene tetracarboxylic dianhydride(NTDA),TWS,TWO and other non-sulfonated diamines were successfully synthesized. The SPIs have ion exchange capacity (IEC) of 1.41-2.03 meq g-1 and high desulfonation temperature of 320oC, suggesting the high stability of sulfonic acid groups. The flexible and tough membranes with high mechanical strength were prepared. They showed fairly high proton conductivity(σ). For example, the TWSAP7 with an ion exchange capacity of 1.70 meq g-1 were 125 and 177 mS/cm at 30oC and 80oC in water. They maintained high mechanical strength after aging in water 100oC for 4500 h, showing the excellent water stability. This class of novel sulfonated polyimides containing heterocylic groups is very promising for proton exchange membrane fuel cell.