No abstract

No abstract

Oxidative polycondensation of 3‐(1‐(2‐phenylhydrazono)ethyl)phenol (3‐PHEP) was studied using oxidants such as sodium hypochlorite, air (O2) and hydrogen peroxide in an aqueous alkaline medium under various polymerization conditions. The polymerization yield, molecular weight, solubility, and thermostability of the polymer were investigated. The macromolecular structure of the resulting polymer was characterized by elemental analysis, ultraviolet–visible, Fourier transform infrared, and nuclear magnetic resonance techniques. Thermogravimetric analysis showed poly(3‐PHEP) to be highly stable against thermo‐oxidative decomposition. Mass loss of the polymer was found to be only 16.3% at 1000°C. In addition, the highest occupied molecular orbital–lowest unoccupied molecular orbital energy levels, electrochemical (Eg′) band gaps and optical (Eg) band gaps were calculated from cyclic voltammetry and ultraviolet–visible measurements, respectively. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

The chemical synthesis of a new type of polyphenol was achieved by oxidative polycondensation of 4-((2-phenylhydrazono)methyl) phenol (4-PHMP). The polymerization of 4-PHMP was performed using sodium hypochlorite and air (O 2 ) as oxidizing agents in an aqueous alkaline medium under various polymerization conditions. The molecular weight of the polymer was determined by gel permeation chromatography, and the polymeric structure was characterized by elemental analysis, ultraviolet-visible, Fourier transform infrared and nuclear magnetic resonance techniques. In addition, thermal and electrochemical properties of the synthesized compounds were investigated. According to electrochemical measurements, the polymer had a low band gap (E g 0 ¼ 1.52 eV) and appeared to be an interesting candidate for solar-cell applications.

Abstractpara-Benzylamine substituted oligophenol was synthesized via enzymatic oxidative polycondensation of 4-(benzylamino)phenol (BAP). Polymerization involved only the phenolic moiety without oxidizing the sec-amine (benzylamine) group. Chemoselective polycondensation of BAP monomer using HRP enzyme yielded oligophenol with sec-amine functionality on the side-chain. Effects of various factors including solvent system, reaction pH and temperature on the polycondensation were studied. Optimum polymerization process with the highest yield (63 %) and molecular weight (Mn = 5000, degree of polymerization ≈ 25) was achieved using the EtOH/ buffer (pH 5.0; 1 : 1 vol. ratio) at 25°C in 24 h under air. Characterization of the oligomer was accomplished by

No abstract

No abstract

The oligomer of 4 (4 pyridylmethylideneimino)phenol was formed during oxidative poly condensation in aqueous alkaline medium using oxygen as the oxidant. Optimum conditions of the oxidative polycondensation and the main parameters of the process were found. The maximum yield of the oligomer was 52.4%. The product was characterized by elemental analysis, FT IR spectroscopy, UV Vis spectroscopy, and 1 Н NMR spectroscopy. The molecu lar weight distribution was determined by size exclusion chromatography. Thermogravimetric and differential thermal analyses were carried out for 4 (4 pyridylmethylideneimino)phenol and its oligomer.