writer：Zhaoliang Cui, Naser Tavajohi Hassankiadeh, Yongbing Zhuang, Enrico Drioli*, Young Moo Lee*
keywords：Crystalline polymorphism in poly(vinylidenefluoride)
source：期刊
specific source：Progress in Polymer Science
Issue time：2015年

Two series of sulfonated polybenzothiazoles containing naphthalene,

derived from either 2,2-bis(4-carboxyphenyl) hexafluoropropane (6FA) or

2,6-naphthalene dicarboxylic acid (NA) were synthesized by

polycondensation with non-sulfonated monomer

2,5-diamino-1,4-benzenedithiol dihydrochloride (DABDT) and sulfonated

monomer 4,8-disulfonyl-2,6-naphthalene dicarboxylic acid (DSNA). The

sPBT-6FA series polymers containing DSNA were soluble in polar aprotic

solvents such as dimethyl sulfoxide or 1-methyl-2-pyrrolidinone, whereas

sPBT-NA65 with NA was not soluble in common polar aprotic solvents.

Therefore, the incorporation of both the naphthalene and flexible

hexafluoroisopropylidene units enhanced the solubility of the sPBT

polymer series. The polymers were evaluated as proton exchange membranes

and exhibited excellent dimensional stability, high thermal and

oxidative stabilities, good mechanical properties, and high proton

conductivities. The proton conductivities of sPBT-6FA65 were 0.25 S cm?1 at 80 °C in water and 0.018 S cm?1 at 120 °C under 35% RH.