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Silicon‐organic hybrid polymers and composites prepared in supercritical carbon dioxide
Author(s) -
Green John W.,
Rubal Michael J.,
Osman Brian M.,
Welsch Rodney L.,
Cassidy Patrick E.,
Fitch John W.,
Blanda Michael T.
Publication year - 2000
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/1099-1581(200008/12)11:8/12<820::aid-pat31>3.0.co;2-o
Subject(s) - thermogravimetric analysis , materials science , differential scanning calorimetry , supercritical carbon dioxide , dynamic mechanical analysis , supercritical fluid , fourier transform infrared spectroscopy , chemical engineering , polymer chemistry , infrared spectroscopy , polymer , organic chemistry , composite material , chemistry , physics , engineering , thermodynamics
Silicon‐containing organic/inorganic composites were prepared from poly(styrene‐co‐allyl alcohol) (PSAA) and soluble starch (SS) by infusing SiCl 4 into them using supercritical carbon dioxide ( SC CO 2 ) as the carrier medium. The resulting hybrid materials were studied by Fourier transform infrared spectroscopy (FT‐IR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), dynamic mechanical thermal analysis (DMTA) and elemental analysis. The results of these studies indicated that 12–15% silicon, in the form of SiO 2 , was homogeneously dispersed throughout the PSAA and SS matrices. As a consequence of the interpenetrated SiO 2 network, the thermal and solubility properties of the composites were altered relative to the virgin materials. SC CO 2 was also employed as the reaction medium in platinum‐catalyzed hydrosilation reactions. The diallyl ether of 1,3‐bis(hexafluoro‐2‐hydroxy‐2‐propyl)benzene (1,3‐HFAB) was used in a model reaction along with dimethylphenylsilane as the sililating agent. The reaction mixtures from hydrosilation reactions conducted in both benzene and in SC CO 2 were analyzed by 1 H ‐NMR spectroscopy. Comparison of the spectra indicated that the SC CO 2 reaction provided higher percent conversion in shorter amounts of time. When the 1,3‐HFAB diallyl ether was reacted with disilanes and siloxanes, silicon‐ and fluorine‐containing oligomers were obtained in good yields. Copyright © 2000 John Wiley & Sons, Ltd.