Isobornyl methacrylate (IBMA), a bulky hydrophobic methacrylate, undergoes very fast polymerization, in bulk, with Cu(I)Br/N,N,N 0 ,N 00 ,N 00 -pentamethyldiethylenetriamine (PMDETA)/ethyl-2-bromoisobutyrate system, at ambient temperature. IBMA also undergoes a spontaneous initiator-free polymerization, at ambient temperature, with Cu(I)Br/PMDETA catalytic system in dimethyl sulfoxide-water mixtures. The rate of the polymerization is seen to increase with the water content up to 80 mol % of water. A possible intervention of air in initiation is proposed. The active Cu (0) formed by the disproportionation of Cu(I) species in aqueous medium probably plays a vital role for a possible air-initiation of IBMA via single electron transfer-living radical polymerization (SET-LRP) mech-anism. A high tolerance level to water under SET-LRP conditions is demonstrated. The poly(IBMA) samples obtained exhibit low molecular weight distributions (1. 1-1.3). Similar behavior was not observed with other common methacrylates such as methyl methacrylate, t-butyl methacrylate, cyclohexyl methacrylate, and benzyl methacrylate.
An extract prepared from inexpensive, drumstick leaves having natural transition metals in ppm levels was exploited as a catalyst for a well-controlled synthesis of poly(N-isopropylacrylamide) and poly(methyl acrylate).
The present study aims at the development of luminol pendant functionalized chemiluminescent polymethacrylamides, for sensing and imaging applications. Luminol functionalized poly (methacrylamide) homopolymer was synthesized by the postpolymerization modification of poly(methacryloyl chloride), (PMC) with luminol. Luminol based methacrylamide monomer (LUME) was synthesized using a simple Schotten-Baumann type reaction between methacryloyl chloride and luminol. LUME was copolymerized with hydroxyethyl methacrylate (HEMA) using SET-LRP (Single Electron Transfer-Living Radical Polymerization), a controlled radical polymerization technique. Luminol functionalized homo (PML) and copolymer (PHL) were having excellent solubility in basic medium as well as polar solvents like as dimethyl sulfoxide and dimethyl formamide. Basic solutions of both PML and PHL copolymers were tested for their chemiluminescent sensing of hydrogen peroxide using graphene oxide (GO) as a catalyst. Chemiluminescence intensity was found to be varying linearly with an increase in the concentration of hydrogen peroxide for both these polymers. Upto 1 μM of peroxide can be sensed even with a very dilute solution of PML (1.8x10 À 11 M) and PHL (2x10 À 8 M).These chemiluminescent polymethacrylamides were also studied for peroxide sensing in live cells.
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