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Photochromic Polymer (photochromic + polymer)
Selected AbstractsA High-Content Diarylethene Photochromic Polymer for an Efficient Fluorescence ModulationMACROMOLECULAR RAPID COMMUNICATIONS, Issue 20 2006Yong-Chul Jeong Abstract Summary: A highly fluorescent photochromic polymer, poly-BTFO4, was prepared. The fluorescence quantum yield of the poly-BTFO4 was six times higher than that of BTFO4. Fatigue resistance of the polymer at its photostationary state was significantly enhanced compared with that of BTFO4. Importantly, the poly-BTFO4 film also showed an efficient photochromism as well as strong fluorescence similar to the results in solution, which allow photoinduced fluorescence switching applicable to optical switches. Improvement of fluorescence quantum yield and fatigue resistance. [source] Photochromic Polymers Based on the Photoinduced Opening and Thermal Closing of [1,3]Oxazine RingsADVANCED FUNCTIONAL MATERIALS, Issue 24 2009Massimiliano Tomasulo Abstract Two macromolecular constructs incorporating a single polymer backbone with multiple photochromic side chains are developed. Both systems are prepared from preformed photochromic [1,3]oxazines after the ring-opening polymerization of their norbornene appendages. In solution, UV illumination of these polymers opens the [1,3]oxazine rings in their side chains in less than 6,ns and with a quantum yield of 0.09 in both instances. The photogenerated species incorporate a 4-nitrophenolate chromophore, and hence, their formation is accompanied by the appearance of an intense band in the visible region of the absorption spectrum. The photoproducts revert spontaneously to the original state with first-order kinetics in microseconds. Furthermore, both photochromic polymers tolerate hundreds of switching cycles with no sign of degradation, even in the presence of molecular oxygen. Thus, this design logic and choice of functional building blocks can translate into the realization of innovative photoresponsive materials with excellent photochromic performance. [source] A High-Content Diarylethene Photochromic Polymer for an Efficient Fluorescence ModulationMACROMOLECULAR RAPID COMMUNICATIONS, Issue 20 2006Yong-Chul Jeong Abstract Summary: A highly fluorescent photochromic polymer, poly-BTFO4, was prepared. The fluorescence quantum yield of the poly-BTFO4 was six times higher than that of BTFO4. Fatigue resistance of the polymer at its photostationary state was significantly enhanced compared with that of BTFO4. Importantly, the poly-BTFO4 film also showed an efficient photochromism as well as strong fluorescence similar to the results in solution, which allow photoinduced fluorescence switching applicable to optical switches. Improvement of fluorescence quantum yield and fatigue resistance. [source] Photochromic Polymers Based on the Photoinduced Opening and Thermal Closing of [1,3]Oxazine RingsADVANCED FUNCTIONAL MATERIALS, Issue 24 2009Massimiliano Tomasulo Abstract Two macromolecular constructs incorporating a single polymer backbone with multiple photochromic side chains are developed. Both systems are prepared from preformed photochromic [1,3]oxazines after the ring-opening polymerization of their norbornene appendages. In solution, UV illumination of these polymers opens the [1,3]oxazine rings in their side chains in less than 6,ns and with a quantum yield of 0.09 in both instances. The photogenerated species incorporate a 4-nitrophenolate chromophore, and hence, their formation is accompanied by the appearance of an intense band in the visible region of the absorption spectrum. The photoproducts revert spontaneously to the original state with first-order kinetics in microseconds. Furthermore, both photochromic polymers tolerate hundreds of switching cycles with no sign of degradation, even in the presence of molecular oxygen. Thus, this design logic and choice of functional building blocks can translate into the realization of innovative photoresponsive materials with excellent photochromic performance. [source] | ||||||||||