Some Physical Properties of Vinylpyridine Carbon-Black Composites | ||||
| Egyptian Journal of Solids | ||||
| Article 10, Volume 25, Issue 1, 2002, Page 103-113 PDF (204.8 K) | ||||
| DOI: 10.21608/ejs.2002.150467 | ||||
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| Abstract | ||||
| Samples of 2-Vinylpyridine oligomer and polymer were prepared by chemical method. The polymer and the oligomer were hot-pressed with different wt% of C-black. The molecular weights of the oligomer and polymer were measured. The electrical conductivity of the polymer-C-black and the oligomer- C- black composites were measured in the temperature range from 303 to 353 K as a function of carbon content. The results have been discussed and compared with those of the oligomer and the polymer–CH3I complex. It was found that the activation energy for different samples decreased with increasing C-black percentage. The diffused reflectance of polymer C-black, oligomer-Cblack composites and oligomer-CH3I, polymer-CH3I complex was measured at room temperature in the wavelength range from 500 to1800 nm. The analysis of optical absorption spectra revealed the existence of two indirect transitions. It is found that the optical energy gaps of these samples decrease with increasing C-black percentages. | ||||
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