Highly Swellable, Dual‐Responsive Hydrogels Based on PNIPAM and Redox Active Poly(ferrocenylsilane) Poly(ionic liquid)s: Synthesis, Structure, and Properties. Issue 23 (24th October 2016)

• Record Type: Journal Article
• Authors: Feng, Xueling; Zhang, Kaihuan; Chen, Peng; Sui, Xiaofeng; Hempenius, Mark A.; Liedberg, Bo; Vancso, G. Julius
• Other Names: Lendlein Andreas guestEditor.
• Is Part Of: Macromolecular rapid communications. Volume 37:Issue 23(2016)
• Page Start: 1939
• Page End: 1944
• Publication Date: 2016-10-24
• Subjects: hydrogels -- nanoparticles -- poly(ferrocenylsilane)s -- poly(ionic liquid)s -- stimuli‐responsive polymers; Macromolecules -- Periodicals; Polymers -- Periodicals; Chemistry -- Periodicals; 547.705
• DOI: 10.1002/marc.201600374
• Languages: English
• ISSNs: 1022-1336

Abstract

Abstract : 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. Abstract : Highly swellable, dual‐responsive poly( N ‐isopropylacrylamide)/poly(ferrocenylsilane)‐vinylimidazolium hydrogels are fabricated and used as the reducing environment to produce gold nanoparticles inside the hydrogel in situ. Optical properties of the hybrid system could be tuned reversibly by the volume‐phase transition of the stimuli‐responsive hydrogel.