Title
Thermal transformation of polyacrylonitrile deposited on SBA-15 type silica Thermal transformation of polyacrylonitrile deposited on SBA-15 type silica
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
,
Subject
Chemistry
Source (journal)
Journal of thermal analysis and calorimetry. - Place of publication unknown
Volume/pages
110(2012) :1 , p. 119-125
ISSN
1388-6150
ISI
000309709900016
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Thermogravimetry, diffuse reflectance infrared Fourier transform spectroscopy, and X-ray photoelectron spectroscopy (XPS) were used for the studying of thermally induced structural changes of polyacrylonitrile (PAN) deposited on the surface of SBA-15 type mesoporous silica. Polymer was introduced onto the support by the precipitation polymerization of acrylonitrile in aqueous suspension of SBA-15. Low temperature transformation (to 723 K) of the deposited PAN was analyzed. It was found that at about 523 K, exothermic cyclization of polymer chains to the so-called ladder form of PAN occurred. However, the total cyclization of PAN required higher carbonization temperatures, at which gradual dehydrogenation followed by graphitization was initiated. XPS revealed that the cyclic form of PAN and a relatively large amount of carbonyl species, formed during the carbonization of the PAN/SBA-15 composite at 623 K, were responsible for the high sorption capacity in the methylethyl ketone (MEK) vapor elimination. The efficiency in the MEK adsorption was also influenced by the content of PAN-derived carbon deposited on the SBA-15 surface.
E-info
https://repository.uantwerpen.be/docman/iruaauth/77010e/35a1fd39607.pdf
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