Journal
POLYMER
Volume 53, Issue 10, Pages 2032-2037Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2012.03.014
Keywords
Adsorption; Microporous polymers; Microsphere
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Funding
- Ministry of Science and Technology of China [2011CB932500]
- National Science Foundation of China [20972035, 91023001, 21002017]
- Chinese Academy of Sciences [KJCX2-YW-H21]
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Using two spirocyclic core building units, microporous polymeric spheres SPOP-5 and SPOP-6 have been successfully prepared through a surfactant-free Suzuki coupling polymerization in a single-phase, which is different from the commonly employed heterogeneous polymerization technique. Especially, for SPOP-6, the SEM image shows that the polymer consists of relatively uniform monodisperse solid microspheres with particle sizes about 500 nm in diameter. The mechanism of microsphere formation is believed to occur by a two-step process involving particle nucleation and subsequent growth. The Brunauer-Emmett-Teller (BET) specific surface area for these polymers ranges from 705 to 744 m(2) g(-1). Based on the gas (H-2 or CO2) physisorption isotherms, an increase in the gas loading capacity with increasing specific surface area is observed. Especially, hydrogen adsorption isotherms show that the adsorption capacity of SPOP-6 for hydrogen is 1.62 wt% at 1.0 bar and 77 K, which can be competitive with, even higher than lots of porous polymers with higher BET specific surface area under the same conditions. (C) 2012 Elsevier Ltd. All rights reserved.
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