Probing the dielectric environment surrounding poly(N-isopropylacrylamide) in aqueous solution with covalently attached spirobenzopyran.
The dielectric environment surrounding poly(N-isopropylacrylamide) in aqueous solution was investigated by probing with spirobenzopyran covalently attached as a side chain to the polymer main chain. Inherent characteristics of the spirobenzopyran chromophore were analyzed, and the chromophore was confirmed to be suitable to probe the local polar condition around the polymer. Measurements for an aqueous polymer solution at various temperatures elucidated that the dielectric environment surrounding the polymer changed continuously even in the temperature range far below the lower critical solution temperature. This result suggested that the local and weak orientation of water molecules around the polymer diminished continuously in a preliminary stage of shifting to thermally induced phase separation. The dielectric environment surrounding thermoresponsive polymer in aqueous solution was investigated by probing with spirobenzopyran covalently attached as a side chain to the polymer main chain.
National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
Mitsuyoshi
M
Kameda
Kimio
K
Sumaru
Toshiyuki
T
Kanamori
Toshio
T
Shinbo
D000180:Acrylic Resins / Q000737:chemistry*; D001578:Benzopyrans / Q000737:chemistry*; D004553:Electric Conductivity; D004563:Electrochemistry / Q000379:methods; D015394:Molecular Structure; D012996:Solutions / Q000737:chemistry; D013141:Spiro Compounds / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry
D000180:Acrylic Resins; D001578:Benzopyrans; D012996:Solutions; D013141:Spiro Compounds; D014867:Water; C052970:poly-N-isopropylacrylamide