Synthesis, Characterization and Thermal Degradation of Substituted Acetophenone Based Terpolymers Having Biological Activities

Journal of Macromolecular Science Part A (Impact Factor: 0.81). 06/2011; 48(6):482-492. DOI: 10.1080/10601325.2011.573367
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    ABSTRACT: Radical copolymerization of 2, 4-dinitrophenylaminomaleimide (DNPAMI) with methyl/ethyl/ butyl substituted acrylates were prepared at 65 oC in tetrahydrofuran (THF) solution with azoisobutyronitrile (AIBN) as an initiator. The structures of copolymers were elucidated by FT-IR, 1H NMR and elemental analysis. The copolymer composition was determined from the N/C ratio based on elemental analysis data and with 1H NMR spectroscopy for copolymers using a proton signal attributed to the alkyl (methyl, ethyl or butyl) of substituted acrylates (δ = 0.7–1.4 ppm) and the area of aromatic ring protons (δ = 7.2–7.8 ppm), where the proton/area relationship confirmed the copolymer compositions. The number average molecular weight and polydispersity indices determined by gel-permeation chromatography were ranging from 27.6 to 31.1 kDa and 1.36 to 1.51, respectively. The initial decomposition temperature is about 203 to 211 oC. The thermal behavior can be correlated with the copolymer composition. An increase of the thermal decomposition temperature occurred when the content of acrylate increased. The reasonably good antibacterial and antifungal activities of the copolymers could be ideal candidates for amtimicrobial coating applications.
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    ABSTRACT: A terpolymer poly (vanillin-co- furfural-co-4-methylacetophenone) has been prepared by polycondensation technique in the presence of an acid catalyst. The structure of terpolymer has been elucidated on the basis of various physico-chemical techniques like FT-IR, 1H NMR, Pyrolysis (Py) (gas chromatography/mass spectroscopy, GC/MS), nitrogen adsorption/desorption analysis, gel permeation chromatography, thermogravimetry – derivative of thermogravimetry (TG-DTG), and differential scanning calorimetry. The apparent activation energies (Ea) of each step (0.1 ⩽ α ⩽ 0.9) during thermal degradation have been determined using Flynn-Wall-Ozawa method. The degradation through random scission and unzipping mechanism is discussed based on the kinetics by nonisothermal kinetics by TG-DTG and products obtained by Py (GC/MS). The type of solid-state mechanism is three-dimensional diffusion.
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Jun 1, 2014