Synthesis, water stability and proton conductivity of novel sulfonated polyimides from 4,4′-bis(4-aminophenoxy)biphenyl-3,3′-disulfonic acid

Sulfonated poly(arylene-co-imide)s as water stable proton exchange membrane materials for fuel cells

“…Therefore, the development of low cost and high performance polymers as alternative materials is strongly desired. Sulfonated polyimides (SPIs) have been accepted as one of the most promising candidates for PEMFC application due to their low methanol permeability, excellent thermal and mechanical stabilities, and good film forming ability [7][8][9][10][11][12][13][14][15][16][17][18][19]. Water stability of SPIs is an important factor that affects the fuel cell performance since the aromatic imide linkage tends to hydrolyze under high moisture conditions and high temperatures, and this result in the degradation of the polymer main chain and a dramatic drop in the mechanical strength.…”

Methanol permeability and proton conductivity of sulfonated co-polyimide membranes

“…To date, many kinds of non-fluorinated PEMs based on sulfonated aromatic hydrocarbon polymers have been de- veloped [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], among which sulfonated polyimides (SPIs) are one of the most promising candidates. Recently, we developed a series of novel SPIs derived from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA) and sulfonated and non-sulfonated aromatic diamines, whose chemical structures are shown in Fig.…”

“…Recently, we developed a series of novel SPIs derived from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA) and sulfonated and non-sulfonated aromatic diamines, whose chemical structures are shown in Fig. 1 [14][15][16][17][18]. They are classified into two types.…”

“…They are classified into two types. One is the main-chain-type where the sulfonic acid groups are directly bonded to the polymer backbone [14,15]. The typical example is SPI derived from NTDA and 4,4 -bis(4-amino-phenoxy) biphenyl-3,3 -disulfonic acid (BAPBDS).…”

Preparation of Polybenzimidazole-Based Membranes and Their Potential Applications in the Fuel Cell System

“…Acid doping into aromatic polymer materials is one of the more interesting approaches in designing proton conductive films with good thermal and chemical stabilities for alternative fuel cell membranes (e.g., polyimides, polysulfones, polybenzoxazoles, poly(ether ether ketones), and polybenzimidazoles (PBIs)) [2,[4][5][6][8][9][10][11][12][13]. In this study, we have employed PBI, which is very cheap and exhibits thermally and chemically stable properties under various conditions [6,[14][15][16][17].…”