Fluorescent and magnetic poly(styrene) (PS) based random co-polymer nanofiber was synthesized in a controlled manner via chemical polymerization in three steps. A fluorescent and magnetic nanohybrid {Fe 3 O 4 /Congored (CR)} was separately prepared and chemically grafted onto the epichlorohydrin (ECH) units of the random co-polymer. Characterizations of the above synthesized polymers were done with the help of Fourier transform infrared (FTIR) spectroscopy, UV-visible spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, fluorescence emission spectroscopy, field emission scanning electron microscopy (FESEM), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM) measurement, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and gel permeation chromatography (GPC) like analytical techniques. The FESEM results indicated that after the grafting of nanohybrid onto the random co-polymer backbone, the polymer exhibited a nanofiber like morphology. Due to the surface functionalization and encapsulation reactions, the magnetic moment value of the nanohybrid and its nanocomposites were found to be reduced. Synthesis and characterization of magnetic and fluorescent random co-polymer based nanofiber is the primary target of the present investigation and its application is extended to the catalysis field.
SYNOPSISPolymerization of methyl methacrylate (MMA) was carried out in aqueous sulfuric acid medium at 3OoC using ammonium ceric sulfate (ACS)/methyl ethyl ketone ( M E K ) and ammonium ceric sulfate/acetone as redox initiator systems. A short induction period was observed with both the initiator systems, as well as the attainment of limiting conversion for polymerization reactions. T h e rate of ceric ion consumption, Rc,, was first order with respect to Ce(1V) concentration in the concentration range (0.5-5.5) X 10-3M, and 0.5 order with respect to reducing agent concentration in the concentration ranges (0.0480-0.2967M) and (0.05-0.3912M) for Ce(1V)-MEK and Ce(1V)-acetone initiator systems, respectively. A fall in Rce was observed a t higher reducing agent concentrations. T h e plots of Rc, versus reducing agent concentrations raised t o the half power yielded straight lines passing through the origin, indicating the absence of complex formation between reducing agents and Ce(1V). T h e addition of sodium sulfate t o maintain constant sulfate ion concentration in the reaction medium could bring down the Rce values in the present reaction systems. T h e rate of polymerization of MMA, R,, increased with increase in Ce(IV), reducing agent, and monomer concentrations for the Ce(1V)-MEK initiator. T h e rate of polymerization of MMA is independent of Ce(1V) concentration a n d increased with a n increase in reducing agent and monomer concentrations for the Ce(1V)-acetone initiator. At higher concentrations of reducing agent (0.4-0.5M), a steep fall in R, values was observed with both the initiator systems. T h e orders with respect t o Ce(IV), MEK, and MMA using the Ce(1V)-MEK initiator were found t o be 0.23, 0.2, a n d 1.29, respectively. T h e orders with respect to Ce(IV), acetone, and MMA using the Ce(1V)-acetone initiator were found t o be zero, 0.42, and 1.64, respectively. Maintaining constant [SO:-] in the reaction medium could bring down Rp values for the Ce(1V)-MEK initiator system. On the other hand, a rise in Rp values with a n increase in [Na,SO,] could be observed when constant [SO:-] was maintained in the reaction medium for the Ce(1V)-acetone initiator system. A kinetic scheme involving direct attack of Ce(1V) on reducing agent, production of radicals, initiation, ccc 0 0~1 -~9 9 5 / 9~/ 0 2 0 2 5 7 -1~
weight average molecular weight (M w ) of the copolymer and nanohybrid-grafted copolymer exhibited higher M w than that of the PECH homopolymer. In the present study, we simply prepared a novel material and characterized it by various analytical methods.Abstract A magnetic and fluorescent copolymer nanocomposite was prepared and characterized by various analytical techniques. Poly(epichlorohydrin) (PECH) was prepared by solution polymerization method using methacrylic acid as a chemical initiator and its copolymer was prepared by emulsion polymerization. After the structural modification of the copolymer with a nanohybrid system, its thermal properties were improved. The nanohybrid system consisting of Congo red dye decorated ferrite nanoparticles was synthesized by the conventional method and characterized by UV-Visible, fluorescence emission and excitation spectroscopy methods, high resolution transmission electron microscopy, and vibrating sample magnetometer techniques. Due to the decoration and encapsulation phenomena, the magnetic moment value of Fe 3 O 4 was found to be decreased. While increasing the loading of nanohybrid system, the glass transition temperature (T g ) of poly(methylmethacrylate) was increased. The TGA study inferred that by increasing the loading of nanohybrid system, the percentage weight residue remained above 550 °C was also increased. The chemical grafting of nanohybrid system onto the PECH-based copolymer backbone was confirmed by NMR spectroscopy and GPC analysis. The Electronic supplementary material The online version of this article (
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