Thermoresponsive and Redox Behaviors of Poly(N-isopropylacrylamide)-Based Block Copolymers Having TEMPO Groups as Their Side Chains | Zendy

Toru Uemukai | Zendy; Tomoya Hioki | Zendy; Manabu Ishifune | Zendy

Open Access

Thermoresponsive and Redox Behaviors of Poly(N-isopropylacrylamide)-Based Block Copolymers Having TEMPO Groups as Their Side Chains

Author(s) -

Toru Uemukai,

Tomoya Hioki,

Manabu Ishifune

Publication year - 2013

Publication title -

international journal of polymer science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.399

H-Index - 33

eISSN - 1687-9430

pISSN - 1687-9422

DOI - 10.1155/2013/196145

Subject(s) - copolymer , lower critical solution temperature , poly(n isopropylacrylamide) , polymer chemistry , chain transfer , raft , materials science , polymerization , redox , methacrylate , reversible addition−fragmentation chain transfer polymerization , thermoresponsive polymers in chromatography , cyclic voltammetry , radical polymerization , polymer , chemistry , electrode , phase (matter) , electrochemistry , organic chemistry , reversed phase chromatography , composite material , metallurgy

Thermoresponsive and redox-active block copolymers having 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) moieties have been synthesized by using the reversible addition-fragmentation chain transfer (RAFT) polymerization technique. N-Isopropylacrylamide (NIPAAm) and 2,2,6,6-tetramethylpiperidyl methacrylate (TEMPMA) monomers were copolymerized stepwise under RAFT polymerization conditions to afford the thermoresponsive block copolymers, PNIPAAm-block-PTEMPMA and PNIPAAm-block-PTEMPMA-block-PNIPAAm. Oxidation of tetramethylpiperidine groups in the copolymers successfully afforded the corresponding TEMPO-containing block copolymers. The resulting triblock copolymer was found to be thermoresponsive showing lower critical solution temperature (LCST) at 34∘C in its aqueous solution. Redox behavior of the resulting copolymer was observed by cyclic voltammetry. The potential of anodic current peak changed below and above the LCST of the block copolymer. These results indicate that the phase transition of thermoresponsive polymer influences the redox potential of TEMPO moieties

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