Potentiometric titration behavior of poly(acrylic acid) within a cross-linked polymer network having amide groups |
| |
| Authors: | Mika Furukawa Raymond S Farinato Etsuo Kokufuta |
| |
| Institution: | (1) Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba Ibaraki, 305-8572, Japan;(2) Kemira Water Solutions, Inc., 1937 W. Main St., Stamford, CT 06904, USA;(3) Graduate School of Life and Environmental Sciences and Institute of Applied Biochemistry, University of Tsukuba, Tsukuba Ibaraki, 305-8572, Japan |
| |
| Abstract: | This study aimed to investigate the effect of COOH group distribution within a polymer network having amide groups, with which
the COOH could form hydrogen bonds. We employed here two polyelectrolyte gels composed of N-isopropylacrylamide (NIPA) networks, either copolymerized with acrylic acid (AA) or within which poly(acrylic acid) (PAA)
was entrapped. Both gels (AA–NIPA ∼ 1:4 mol/mol) were prepared by aqueous red-ox polymerization with N,N’-methylenebisacrylamide as the cross-linker. Finely divided gels in NaCl solutions (0.025 and 0.1 M) were titrated with NaOH
and back-titrated with HCl at 25 °C. The results of the copolymer gel (CG) agreed well with those of a linear copolymer and
a nanoscale gel which had a similar AA content to CG. However, marked differences were observed in the titration behaviors
of the AA-copolymerized and PAA-entrapped gels, mainly due to the hydrogen bonding between the entrapped PAA chain and its
surrounding NIPA network. |
| |
| Keywords: | Poly(N-isopropylacrylamide)-based polyelectrolyte gels Gel-entrapped poly(acrylic acid) Potentiometric titration Interpolymer complex Hydrogen bonding |
| 本文献已被 SpringerLink 等数据库收录！ |
|
