preparation of polyamide 6/silica nanocomposites from silica surface initiated ring-opening anionic polymerization

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ID: 239007
2007
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Abstract
Polyamide 6/silica nanocomposites were synthesized by in situ ring-opening anionic polymerization of ε-caprolactam in the presence of sodium caprolactamate as a catalyst and caprolactam-functionalized silica as an initiator. The initiator precursor, isocyanate-functionalized silica, was prepared by directly reacting commercial silica with excess toluene 2,4-diisocyanate. This polymerization was found to occur in a highly efficient manner at relatively low reaction temperature (170Ā°C) and short reaction times (6 h). FTIR spectroscopy was utilized to follow the introduction and consumption of isocyanate groups on the silica surface. Thermogravimetric analysis indicated that the polyamide 6 was successfully grown from the silica surface. Transmission electron microscopy was utilized to image polymer-functionalized silica, showing fine dispersion of silica particles and their size ranging from 20 to 40 nm.
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Journal introducing the mysql 8 document store
Year 2007
DOI 10.3144/expresspolymlett.2007.61
URL
http://www.expresspolymlett.com/letolt.php?file=EPL-0000241&mi=cd
Keywords
phase separation nanomaterials polymer composites polymer blend hydrotalcite ring-opening polymerization mechanics of materialschemical technology temmaterials of engineering and construction low-molecular-weight polyamidematerials of engineering and construction

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