Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 20, Issue 35, Pages 7444-7450Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm01423k
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Funding
- National Natural Science Foundation of China [50973037]
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This work is aimed at producing uniform microporous polymer nanoparticles (MPNs) and studying their hydrogen storage properties. Synthesis of vinylbenzyl chloride (VBC)/divinylbenzene (DVB) copolymers by emulsion polymerization yield fairly uniform gel-type precursor nanoparticles and the particle size can be tuned from 36 to 131 nm by adjusting the emulsifier dose. These are analogous to gel-type suspension polymerized particles typically of 10-500 mm in diameter and are essentially nonporous in the dry state having only a very nominal surface area (1-2 m(2)/g, BET surface area). Friedel-Crafts- type hyper-cross-linking reaction of these precursors yields uniform MPNs with extremely high surface area up to ca. 1500 m(2)/g (BET surface area). Moreover, MPNs present more micropore volume (0.56 cm(3)/g), higher hydrogen adsorption capacity (1.59 wt%, 77.3 K, 1.13 bar), higher isosteric heats for hydrogen and faster adsorption rate as compared to polydisperse micro-size analogues previously reported.
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