NDLI: Polyurea networks via organic sol–gel crosslinking polymerization of tetrafunctional amines and diisocyanates and their selective adsorption and filtration of carbon dioxide

Content Provider	Royal Society of Chemistry (RSC)
Author	Byeon, Minseon Park, Ji-Woong Jeon, Eunkyung Bae, Jae-Sung Moon, Su-Young
Copyright Year	2014
Abstract	Organic molecular networks were synthesized via organic sol–gel polymerization of tetrakis(4-aminophenyl)methane with various alkyl diisocyanates. Colloidal dispersions of nanoparticulate molecular networks were obtained by controlling monomer combinations and concentrations, which enabled liquid phase processing of the covalent networks into desired forms of materials. Pouring the sols into a non-solvent yielded nanoparticulate networks that showed highly selective adsorption for CO2 over N2 or CH4. Free-standing films of the network material were prepared by evaporation of the sols. The membranes exhibited unusual reverse-selective transport characteristics with lower permeability to CO2 than to N2. This is the first example of gas separation membranes directly prepared from the liquid phase of covalent molecular networks. The organic sol–gel chemistry of covalent molecular networks is promising for the development of new functional adsorbents and membranes because it will enable exploitation of intrinsic microporosity of molecular networks.
Starting Page	1124
Ending Page	1131
Page Count	8
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	5
Issue Number	4
Journal	Polymer Chemistry
DOI	10.1039/c3py01593a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Methane Gas separation Chemistry The Membranes Selective adsorption Permeation Polymerization Covalent bond Monomer
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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