Abstract
The purpose of this study is to examine the structure and the temperature-responsive anion exchange property of amino-functionalized mesoporous silica coated with temperature-responsive copolymer, poly(N-isopropylacrylamide-co-acrylamide) (P(NIPAM-co-Am)). For this purpose, the composites which contained 0, 10, or 20 wt% of Am were synthesized. From the TG results, it was found that the amounts of copolymer immobilized on the mesoporous silica were 1.6 - 2.6 wt%. XRD patterns revealed that the structures of composites were hexagonal and almost the same as that of original mesoporous silica without polymer. At low temperature the methyl orange (MO) anions adsorbed and desorbed reversibly with changing pH of the solution, while at high temperature the MO anions did not. This temperature, at which the amount of adsorbed MO anions changed considerably, shifted to the higher temperature side with increasing the amount of added Am.
Highlights
Materials composed of stimuli-responsive polymer and mesoporous silica have been synthesized widely [1]-[11]
The methyl orange (MO) anions could penetrate through the PNIPAM layer because of the hydrophilic property of the PNIPAM on the external surface of the composite below the LCST, while the MO anions could hardly penetrate through the PNIPAM layer because of the hydrophobic property of the PNIPAM above the LCST
In the MS sample, the appearance of three diffraction peaks that can be attributed to a hexagonal lattice is typical of MCM-41 type mesoporous silica
Summary
Materials composed of stimuli-responsive polymer and mesoporous silica have been synthesized widely [1]-[11]. The LCST of the polymer, the methyl orange (MO) anions could be adsorbed and desorbed reversibly depending on the pH of the aqueous solution. The LCST, on the other hand, the MO anions could not be adsorbed and desorbed independent of the pH of the aqueous solution. These phenomena were considered to be due to the change in the surface property of the synthesized composite with the change in the solution temperature. The MO anions could penetrate through the PNIPAM layer because of the hydrophilic property of the PNIPAM on the external surface of the composite below the LCST, while the MO anions could hardly penetrate through the PNIPAM layer because of the hydrophobic property of the PNIPAM above the LCST
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