Thermally Rearranged Poly(benzoxazole-co-imide) Membranes with Superior Mechanical Strength for Gas Separation Obtained by Tuning Chain Rigidity

Title
Thermally Rearranged Poly(benzoxazole-co-imide) Membranes with Superior Mechanical Strength for Gas Separation Obtained by Tuning Chain Rigidity
Authors
이영무
Keywords
POSITION FUNCTIONAL-GROUP; PRECURSOR SYNTHESIS ROUTE; INTRINSIC MICROPOROSITY; TRANSPORT-PROPERTIES; TROGERS BASE; FREE-VOLUME; CO2 SEPARATION; POLYMERIC MEMBRANES; PERMEABILITY; POLYIMIDES
Issue Date
2015-04
Publisher
AMER CHEMICAL SOC
Citation
MACROMOLECULES, v. 48, NO 7, Page. 2194-2202
Abstract
Thermally rearranged polybenzoxazoles (TR-PBO) are some of the most promising materials for gas separation because of their microporous and bimodal cavities that offer high gas transport performance. However, the brittleness of fully converted TR-PBO membranes has impeded their widespread industrial implementation. In this study, we prepared novel, thermally rearranged poly(benzoxazole-co-imide) membranes (TR-PBOI) with improved mechanical strength and good gas separation performance. These membranes are based on two commercially available TR-able diamines and two non-TR-able diamines with various compositions and different polymer rigidities. TR-PBOI membranes with the appropriate ratio of PBO and PI displayed a high fractional free volume and therefore exceptional gas separation properties (CO2 permeability over 300 barrer and CO2/N-2 ideal selectivity above 20); both these values were higher than those of the corresponding original TR-PBO membranes. Furthermore, a substantial improvement in the mechanical properties of TR-PBOI membranes relative to their TR-PBO counterparts was observed.
URI
http://pubs.acs.org/doi/abs/10.1021/acs.macromol.5b00413http://hdl.handle.net/20.500.11754/23879
ISSN
0024-9297; 1520-5835
DOI
http://dx.doi.org/10.1021/acs.macromol.5b00413
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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