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Highly Swellable, Dual‐Responsive Hydrogels Based on PNIPAM and Redox Active Poly(ferrocenylsilane) Poly(ionic liquid)s: Synthesis, Structure, and Properties
Author(s) -
Feng Xueling,
Zhang Kaihuan,
Chen Peng,
Sui Xiaofeng,
Hempenius Mark A.,
Liedberg Bo,
Vancso G. Julius
Publication year - 2016
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201600374
Subject(s) - lower critical solution temperature , poly(n isopropylacrylamide) , materials science , self healing hydrogels , photoinitiator , polymer chemistry , polymerization , ionic liquid , chemical engineering , nanoparticle , surface plasmon resonance , redox , swelling , copolymer , monomer , chemistry , nanotechnology , polymer , composite material , organic chemistry , catalysis , engineering , metallurgy
Highly swellable, dual‐responsive hydrogels, consisting of thermo‐responsive poly( N ‐isopropylacrylamide) (PNIPAM) and redox‐responsive poly(ferrocenylsilane) (PFS) based poly(ionic liquid)s (PILs) are formed by photo‐polymerization. PFS chains bearing cross‐linkable vinylimidazolium (VIm) side groups are copolymerized with NIPAM in aqueous solutions under ultraviolet light (λ = 365 nm) in the presence of a photoinitiator. The PFS‐PILs serve as a macro‐cross‐linker and also provide redox responsiveness. The swelling ratio, morphology, and lower critical solution temperature (LCST) of the hydrogels are studied as a function of the PNIPAM/PFS ratio. The value of the LCST is dependent on the choice of the counterion of the PIL and the PNIPAM/PFS ratio. The hydrogel is employed as a reducing environment for the in situ fabrication of gold nanoparticles (AuNPs), forming AuNP‐hydrogel composites. The localized surface plasmon resonance peak of the as‐synthesized Au nanoparticles inside the hydrogel could be tuned by altering the temperature.