1234951-69-9Relevant academic research and scientific papers
Photoregulated optical switching of poly(N-isopropylacrylamide) hydrogel in aqueous solution with covalently attached spironaphthoxazine and D-π-A type pyran-based fluorescent dye
Kim, Sung-Hoon,Hwang, In-Jeong,Gwon, Seon-Yeong,Son, Young-A.
, p. 158 - 163 (2010)
A thermoresponsive poly(NIPAM-co-SPO-co-fluorophore) hydrogel comprising poly(N-isopropylacrylamide) that was partially modified using an electron donor-π-conjugated-electron acceptor (D-π-A) pyran-based fluorescent dye using radical copolymerization as well as a photochromic spironaphthoxazine unit displayed a lower critical solution temperature transition from 28 to 50?°C in aqueous solution. The poly(NIPAM-co-SPO-co-fluorophore) copolymer exhibited excellent photochromic behavior in both aqueous solution and hydrogel state. The fluorescence intensity of the poly(NIPAM-co-SPO-co-fluorophore) was temperature-dependent. The relationship between fluorescence intensity change and size of the polymer aggregates was determined using dynamic light scattering. Reversible modulation of fluorescence intensity was achieved using alternating irradiation with UV and visible light. The internal microstructure of the poly(NIPAM-co-SPO-co-fluorophore) hydrogel was investigated using SEM.
The thermoresponsive behaviour of a poly(N-isopropylacrylamide) hydrogel with a D-π-A type pyran-based fluorescent dye
Kim, Sung-Hoon,Hwang, In-Jeong,Gwon, Seon-Yeong,Son, Young-A.
, p. 84 - 88 (2010)
A thermoresponsive poly(NIPAM-co-fluorophore) hydrogel labeled with pyran-based fluorescent dye was prepared using conventional radical copolymerization. The low critical solution temperature behaviour was investigated using UV-vis spectroscopy which allowed the measurement of the phase transition over a wide range of temperature. The poly(NIPAM-co-fluorophore) in aqueous solution underwent a phase transition at 36-58?°C. The fluorescence intensities of the polymer in aqueous solution increased with increasing temperature across the low critical solution temperature transition range. The fluorophore displayed a blue shift in emission with increase in temperature due to destabilization of the excited state. Evidence from fluorescence and dynamic light scattering demonstrated that, >58?°C, the size of the polymer aggregates was 12,500?m. The morphology of the internal microstructure of the poly(NIPAM-co-fluorophore) hydrogel was observed using scanning electron microscopy.
