Synthesis, Characterization and Photoluminescence Study of Novel Sulfobetaine Polyelectrolytes
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A novel sulfobetaine copolymer is developed via polycondensation approach. The comonomers, melamine, condenses with a diketone, 5,5-dimethyl-1,3-cyclohexane (dimedone) to produce polyimine chain based on Schiff base chemistry. Dimedone-[N,N’ melaminium] propane sulfonate copolymer crystals were obtained on treatment of the polyimine with sulfopropylating agent, 1,3-propane sultone with a crosslinker, di(ethylene glycol diacrylate) (DEGDA). This crosslinked sulfobetaine polymer yielded fine needle like single crystals and shows strong blue fluorescence and a week green phosphorescence. Multi-exponential fluorescence decay function indicates the presence of different conformers both in solution and crystalline phase. This easy straightforward protocol for synthesis of crystalline, soluble, and luminescent polymer could prove to be a landmark in development of next generation smart functional materials.
KeywordsPolyimine Sulfobetaine Crosslinking Luminescence
The financial support by Department of Science and Technology [SR/S2/CMP-65/2007] is gratefully acknowledged. Authors acknowledge Prof.GVS Sastry (SEM), Dr. B Ray (GPC) and Dr. S Pant with his research group for their kind help. Authors are also highly thankful to Prof. C.D. Geddes, Director Institute of fluorescence, UMBC, Baltimore MD, USA for some of the time domain fluorescence measurements.
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