作者：Yongbing Zhuang, Jong Geun Seong, Won Hee Lee, Yu Seong Do, Moon Joo Lee, Gang Wang, Young Moo Lee*, Michael D. Guiver*
关键字：聚酰亚胺，气体分离膜
论文来源：期刊
具体来源：Macromolecules
发表时间：2015年

Insufficient mechanical properties are one of the major obstacles for

the commercialization of ultrahigh permeability thermally rearranged

(TR) membranes in large-scale gas separation applications. The

incorporation of preformed benzoxazole/benzimidazole units into o-hydroxy

copolyimide precursors, which themselves subsequently thermally

rearrange to form additional benzoxazole units, were prepared for the

first time. Using commercially available monomers, mechanically tough

membranes prepared from random and block TR poly(benzoxazole-co-imide)

copolymers (TR-PBOI) were investigated for gas separation. The effects

of the chemical structures, copolymerization modes, and thermal holding

time of o-hydroxy copolyimides on the molecular packing and

properties, including gas transport, for the resulting TR-PBOI membranes

have been examined in detail. After treatment at 400 °C, tough TR-PBOI

membranes exhibited tensile strengths of 71.4–113.9 MPa and elongation

at break of 5.1–16.1%. Moreover, they presented higher or comparable gas

transport performance as compared to those tough/robust TR membranes

reported previously. Reported for the first time is a comparative

investigation of the copolymerization mode (random or block) on membrane

properties. The novel polymer architecture and systematic property

studies promote a better understanding of the materials and process

development of commercial TR membranes for gas separation applications.