Cross-Linked Thermally Rearranged Poly(benzoxazole-co-imide) Membranes Prepared from ortho-Hydroxycopolyimides Containing Pendant Carboxyl Groups and Gas Separation Properties

Title
Cross-Linked Thermally Rearranged Poly(benzoxazole-co-imide) Membranes Prepared from ortho-Hydroxycopolyimides Containing Pendant Carboxyl Groups and Gas Separation Properties
Author
이영무
Keywords
CONTAINING PHOTOREACTIVE POLYIMIDES; CO2 PLASTICIZATION RESISTANCE; PERMEATION PROPERTIES; POLYMER MEMBRANES; SIDE-CHAINS; POLYBENZOXAZOLES; COPOLYIMIDES; CONVERSION; TRANSPORT; PURIFICATION
Issue Date
2015-04
Publisher
AMER CHEMICAL SOC
Citation
MACROMOLECULES, v. 48, NO 8, Page. 2603-2613
Abstract
The incorporation of small amounts of 3,5-diaminobenzoic acid (DABA) comonomer (usually 5-20 mol %) into an ortho-hydroxypolyimide (HPI) precursor constitutes a new methodology to easily improve the gas transport performance of thermally rearranged (TR) polymer membranes. Thermogravimetric analysis (TGA) profiles of HPI with DABA copolyimides (HPID) suggests that there is an overlap between the temperature ranges of two processes: the degradation of DABA carboxyl groups and the actual thermal rearrangement process. During thermal treatment at 450 degrees C, carboxyl pendant groups in DABA degrade while a more rigid biphenyl cross-linked structure is formed either following or at the same time as the rearrangement of imide to benzoxazole. Mixed-gas CO2/CH4 (1:1) experiments proved this new series of cross-linked TR poly(benzoxazole-co-imide) (XTR-PBOI) membranes as superior materials for CO2/CH4 separation applications, with enhanced permeability and selectivity, as well as high resistance to plasticization up to 40 bar.
URI
http://pubs.acs.org/doi/abs/10.1021/acs.macromol.5b00298http://hdl.handle.net/20.500.11754/23704
ISSN
0024-9297; 1520-5835
DOI
10.1021/acs.macromol.5b00298
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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