One-Shot Synthesis of a Poly(N-isopropylacrylamide)/Silica Hybrid Gel

Abstract

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.

Design of poly(N‐acryloylglycine) materials for incorporation of microorganisms

“…The combination of a biological recognition element with a transduction element 8 leads to a selective and quantitative or semi-quantitative analysis system. [20][21][22] To achieve this, an acrylamide with hydrophilic function can be crosslinked to obtain a copolymer, material that can be conveniently handled. One of the technological barriers in the manufacturing of these sensors is the immobilization of BM on their surface.…”

Thermally Stable and Processable Organic-Inorganic Hybrid Material

“…The thermal stability was gradually increased due to the addition of more silica content. The first stage of decomposition is observed between 50 to 125 ºC which is due to the adsorbed water and the residual solvents [28,29]. The main decomposition occurs at 350-430 ºC corresponds to the degradation of main polymer chain [30].…”

Novel thermogelling dispersions of polymer nanoparticles for controlled protein release

“…The composition of IPN nanoparticle was estimated using a thermogravimetric analyzer (TGA Q50, TA instruments, New Castle, DE). 18 Samples of dried poly(oligo(ethylene glycol)) nanoparticles, poly(acrylic acid) and IPN nanoparticles were heated in a platinum pan from room temperature to 600°C at a heating rate of 10°C/min under nitrogen atmosphere. The weight ratio of the PAAc component to the poly(oligo(ethylene glycol)) component was determined by decomposition curve of each samples as previously described.…”