The preparation and properties of hybridized hydrogels based on cubic thiol-functionalized silsesquioxane covalently linked with poly(N-isopropylacrylamide)
Firstly, nano-sized polyhedral oligomeric silsesquioxane with functional mercapto groups (POSS-SH) was prepared through hydrolytic condensation of 3-mercaptopropyl trimethoxysilane. Then N -isopropylacrylamide (NIPAm) was allowed to polymerize at the presence of POSS-SH and N , N -methylene-bisacryl...
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Veröffentlicht in: | Colloid and polymer science 2011-10, Vol.289 (15-16), p.1777-1782 |
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Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Firstly, nano-sized polyhedral oligomeric silsesquioxane with functional mercapto groups (POSS-SH) was prepared through hydrolytic condensation of 3-mercaptopropyl trimethoxysilane. Then
N
-isopropylacrylamide (NIPAm) was allowed to polymerize at the presence of POSS-SH and
N
,
N
-methylene-bisacrylamide to yield hybridized hydrogels. The hybridized hydrogels demonstrated thermosensitive behavior across the volume phase transition temperatures. The swelling and deswelling rates were greatly accelerated through the incorporating of POSS-SH into the gels, and the thermal properties of the hybridized hydrogels were reinforced compared with the neat PNIPAm hydrogel. These results were ascribed to nano-effect created by the hydrophobic POSS-SH nanoparticles. The hybridized hydrogels have potential applications in drug controlled release. |
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ISSN: | 0303-402X 1435-1536 |
DOI: | 10.1007/s00396-011-2510-0 |