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.