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Indexed by:期刊论文

Date of Publication:2016-04-12

Journal:MACROMOLECULES

Included Journals:SCIE、EI、Scopus

Volume:49

Issue:7

Page Number:2575-2581

ISSN No.:0024-9297

Abstract:Monoaldehyde compounds, benzaldehyde, 4-methylbenzaldehyde, 4-fluorobenzaldehyde, and 4-trifluoromethylbenzaldehyde, were utilized to react with melamine respectively to yield four hyper-cross-linked microporous polyaminal networks, PAN-P, PAN-MP, PAN-FP, and PANFMP, via a facile "one-step" polycondensation without adding any catalyst. It is found that relative to non-fluorinated polymers the fluorinated ones show the increased BET specific surface areas from 615 to 907 m(2) g(-1). Moreover, the incorporations of methyl and trifluoromethyl on the phenyl rings can effectively tailor the pore sizes from 0.9 to 0.6 nm. The polar C-F bond and nitrogen-rich polyaminal skeleton result in high CO2 adsorption enthalpies (38.7 kJ mol(-1)) and thereby raise the CO2 uptake up to 14.6 wt % (273 K, 1 bar) as well as large CO2/N-2 and CO2/CH4 selectivities of 78.1 and 13.4 by the ideal adsorbed solution theory, respectively. The facile and scalable preparation method, low cost, and large CO2 adsorption and selectivities over N-2 and CH4 endow the resultant microporous polyaminals with promising applications in CO2-capture from flue gas and natural gas.