One-shot synthesis of a poly(N-isopropylacrylamide)/silica hybrid gel.
Class I hybrid poly(N-isopropylacrylamide)/silica hydrogels, PNIPAM/SiO2, were prepared by a new one shot synthesis. In this approach, the free-radical polymerization of vinyl groups of N-isopropylacrylamide (NIPAM) and the hydrolysis-condensation of alkoxy groups of tetramethoxysilane (TMOS) are performed concomitantly using sodium persulfate and 3-(dimethylamino)-propionitrile, a well-known couple to initiate the organic polymerization. The cross-linker is N,N-methylenebisacrylamide. The kinetic study of mechanical properties from the sol-to-gel state for different ratios of TMOS/NIPAM was investigated by rheological ultrasonic measurements. The thermoresponse of hybrid materials was investigated by differential scanning calorimetry and the measurements showed that hybrid gels present a lower critical solution temperature, which is similar with one of single organic hydrogel.
Banet
P
P
Université de Cergy-Pontoise, ENSEA, ECIME, F-95000 Cergy-Pontoise, France. philippe.banet@u-cergy.fr
Griesmar
P
P
Serfaty
S
S
Vidal
F
F
Jaouen
V
V
Le Huerou
J-Y
JY
D000178:Acrylamides / Q000737:chemistry*; D000180:Acrylic Resins; D002152:Calorimetry, Differential Scanning; D020100:Hydrogels / Q000138:chemical synthesis*; D044367:Phase Transition; D011108:Polymers / Q000737:chemistry*; D012212:Rheology; D012822:Silicon Dioxide / Q000737:chemistry*
D000178:Acrylamides; D000180:Acrylic Resins; D020100:Hydrogels; D011108:Polymers; C052970:poly-N-isopropylacrylamide; D012822:Silicon Dioxide