Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9757042 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2005 | 11 Pages |
Abstract
Kinetics of chemical oxidative polymerization of diphenylamine (DPA) was followed in aqueous 1Â M para-toluene sulphonic acid (p-TSA) using potassium peroxomonosulphate (PMS) or peroxodisulphate (PDS), independently as an oxidant. The medium was found to be homogeneous and became dark green in colour during the course of polymerisation. The course of polymerization was followed by UV-vis spectroscopy. Rate of polymerization (Rp) was determined for various conditions by following the absorbance values corresponding to poly(diphenylamine) (PDPA) for different concentrations of DPA and PMS or PDS at various time intervals of polymerization. The observed dependences of DPA, PDS or PMS on Rp were used to deduce rate equations for PDS or PMS initiated polymerization of DPA. The rate constant for the formation of poly(diphenylamine), was estimated. In situ spectroelectrochemical studies on the polymerization of DPA were also carried out on an ITO electrode in 1Â M p-TSA. The results are in accordance with the intermediates suggested in chemical oxidative polymerization.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
S. Nagarajan, P. Santhosh, M. Sankarasubramanian, T. Vasudevan, A. Gopalan, Kwnag-Pill Lee,