Self-oscillating gel composed of thermosensitive polymer exhibiting higher LCST.
We have developed self-oscillating polymers and gels as novel biomimetic materials by utilizing an oscillating reaction, known as the Belousov-Zhabotinsky (BZ) reaction. The self-oscillating polymer gel is composed of a poly(N-isopropylacrylamide) (PNIPAAm) network in which the catalyst for the BZ reaction is covalently immobilized. Under the coexistence of the reactants, the gel undergoes spontaneous cyclic swelling-deswelling changes without any on-off switching of external stimuli. In order to induce self-oscillation while maintaining a larger amplitude at higher temperatures and around body temperature for potential applications to biomaterials, etc., here we prepared a self-oscillating gel composed of a thermosensitive N,N'-ethylmethylacrylamide (EMAAm) polymer exhibiting a higher LCST than that of the NIPAAm polymer. The self-oscillating behavior of the poly(EMAAm-co-Ru(bpy)(3)) gel was investigated by comparing against gels composed of a thermosensitive NIPAAm polymer with a lower LCST or non-thermosensitive N,N'-dimethylacrylamide (DMAAm) polymer. The design concept of self-oscillation at higher temperatures without a decrease in swelling-deswelling amplitude was demonstrated by utilizing a thermosensitive polymer exhibiting a higher LCST.
Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Mio
M
Hidaka
Ryo
R
Yoshida
D000178:Acrylamides / Q000737:chemistry; D000180:Acrylic Resins / Q000737:chemistry*; D040761:Biomimetic Materials / Q000138:chemical synthesis / Q000737:chemistry; D001959:Bromates / Q000737:chemistry; D002384:Catalysis; D002563:Cerium / Q000737:chemistry; D020100:Hydrogels / Q000138:chemical synthesis / Q000737:chemistry*; D007700:Kinetics; D008314:Malonates / Q000737:chemistry; D055595:Mechanical Phenomena; D017942:Nitric Acid / Q000737:chemistry; D009942:Organometallic Compounds / Q000737:chemistry; D010084:Oxidation-Reduction; D044367:Phase Transition; D011108:Polymers / Q000737:chemistry; D017670:Sodium Compounds / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry; D013696:Temperature; D044366:Transition Temperature; D014867:Water / Q000737:chemistry; D000099166:Polyacrylamides
D000178:Acrylamides; D000180:Acrylic Resins; D001959:Bromates; D002563:Cerium; D020100:Hydrogels; D008314:Malonates; D017942:Nitric Acid; D009942:Organometallic Compounds; D011108:Polymers; D017670:Sodium Compounds; D013431:Sulfates; D014867:Water; D000099166:Polyacrylamides; C429790:poly(N,N-dimethylacrylamide); C415768:tris(2,2'-bipyridyl)ruthenium(II); C107379:cerium sulfate; C052970:poly-N-isopropylacrylamide; C030290:malonic acid; C060553:sodium bromate