TITLE:
Synthesis of P(NIPAM-co-Am)/Mesoporous Silica Composites and Their Temperature- Responsive Anion Exchange
AUTHORS:
Kenji Murakami, Yasuto Sato, Yukihiko Inoue
KEYWORDS:
Mesoporous Silica, Temperature-Responsive Anion Exchanger, N-Isopropylacrylamide, Acrylamide, Transition Temperature
JOURNAL NAME:
Journal of Materials Science and Chemical Engineering,
Vol.3 No.7,
June
16,
2015
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.