000			01931nam a2200301Ia 4500
003			MX-MdCICY
005			20250625164354.0
040			_cCICY
090			_aB-21392
245	1	0	_aSynthesis, characterization and properties of polyimides with spirobisbenzoxazole scaffold structure
490	0		_aPolymer. 254, 125091, 2022, DOI: 10.1016/j.polymer.2022.125091
520	3		_aNovel diamines containing spirobisbenzoxazole scaffold structure were successfully synthesized. These diamines were homopolymerized with commercial 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and cyclohexanedianhydride (H'PMDA) to prepare a series of benzoxazole based polyimides (PBOIs). The obtained PBOIs exhibited good organic solubility and outstanding thermal properties, including glass transition temperature (Tg) of 355-400 °C and 5% thermal decomposition temperatures (Td5%) of 474-490 °C. Meanwhile, these polymer films exhibited excellent mechanical strength, such as tensile strength of 79.4-92.1 MPa and elongation at break of 19.5%?31.2%. In addition, such PBOIs have been proved to be novel microporous polymer with pore width distribution of 5-7 Å and BET surface area of 281-378 m2/g. The permeability-selectivity relationship of H'PMDA based PBOIs was close to the 2008 Robeson upper bound for CO2/CH4 and O2/N2 gas pairs, showing promise in the field of gas separation. © 2022 Elsevier Ltd
650	1	4	_aGAS PERMEABILITY
650	1	4	_aPOLYIMIDE
650	1	4	_aSOLUBLE
700	1	2	_aChen H.
700	1	2	_aDai F.
700	1	2	_aWang M.
700	1	2	_aKe Z.
700	1	2	_aYan K.
700	1	2	_aLi D.
700	1	2	_aChen C.
700	1	2	_aQian G.
700	1	2	_aYu Y.
856	4	0	_uhttps://drive.google.com/file/d/1QRCEopNvYISSDEDfqYabVVpS1QwAyUVh/view?usp=drive_link _zPara ver el documento ingresa a Google con tu cuenta @cicy.edu.mx
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