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.