2015-Soluble sulfonated polybenzothiazoles containing naphthalene for use as proton exchange membranes
writer：Gang Wang, Kang Hyuck Lee, Won Hyo Lee, Na Rae Kang, Dong Won Shin, Yongbing Zhuang, Young Moo Lee*,
keywords：proton exchange membranes
source：期刊
specific source：Journal of membrane science
Issue time：2014年
Polyimides with intrinsic microporosity were readily prepared by
introducing Tr?ger’s base (TB) into the polymer backbone via
polymerization between imide-containing diamines and dimethoxymethane
(DMM). Two imide-containing diamines were prepared by reaction of
2,5-dimethyl-1,4-phenylenediamine (DPD) with
4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and
3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA). The resulting
polyimides were readily soluble in common organic solvents, had good
mechanical properties, with tensile strength in the range of 59–64 MPa
and elongation at break of 5–17%, good thermal stability and extremely
high glass transition temperatures (Tgs), up to 425
°C. The polyimides with incorporated TB units had high fractional free
volume (FFV ≥ 0.215) resulting from poor chain-packing and exhibited
significant microporosity and good gas transport properties. The novel
polymer architecture in this study extends the development of polyimides
with intrinsic microporosity for membrane-based gas separation.