| Autor: |
Umare, Suresh S., Waware, Umesh S., Ingole, Sudeep, Viswanath, S. G. |
| Předmět: |
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| Zdroj: |
International Journal of Polymer Analysis & Characterization; Jan-Apr2005, Vol. 10 Issue 1/2, p1-13, 13p, 3 Diagrams, 5 Charts, 2 Graphs |
| Abstrakt: |
This study covers the synthesis of polymers of aniline, o -phenylenediamine, and their copolymers by chemical oxidation in HCl medium. The composition of the copolymers was changed by varying the monomer feed ratio. For examining the effect of composition on copolymer structure and properties, the copolymers were characterized by elemental analysis, FTIR, UV-visible spectra, and thermal analysis. The electrical conductivity of the compressed pellets was measured by the two-probe method. Magnetic studies shows that the polyaniline is paramagnetic in nature, which shows the presence of three unpaired electrons per chain unit, while the poly( o -phenylenediamine) and copolymers are diamagnetic and are found to contain no unpaired electrons. The copolymer exhibits excellent solubility in DMF. It was interesting to find that 20% o -phenylenediamine-containing copolymer exhibits good solubility by retaining a conductivity similar to polyaniline. The spectroscopic analysis, solubility test, and electrical conductivity suggest that aniline and o -phenylenediamine units are distributed along the copolymer chain and the properties of copolymers can be modified by varying the monomer composition in copolymerization reactions. TG thermogram shows three-stage decomposition of the copolymer. Rapid decomposition starts after 400°C. The observed weight loss of samples was less than 17% at 225°C, showing good thermal stability of copolymers. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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