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http://142.54.178.187:9060/xmlui/handle/123456789/19882| Title: | Lightscattering and Viscosities Measurements of Dilute Solutions of Some Schiff Base Polymers |
| Authors: | ABDUL HAMID CHANNAR KHALIDA PARVEEN MAHAR MUHAMMAD YAR KHUHAWAR SUBHAN MAJIDANO MUHAMMAD SALEEM KHAN |
| Issue Date: | 5-Apr-2010 |
| Publisher: | HEJ Research Institute of Chemistry, University of Karachi, Karachi. |
| Citation: | Channar, A. H., Mahar, K. P., Khuhawar, M. Y., Majidano, S. A., & Khan, M. S. (2010). Lights cattering and Viscosities Measurements of Dilute Solutions of Some Schiff Base Polymers. J. Chem. Soc. Pak, 32(2), 201. |
| Abstract: | Three Schiff base polymers polymethylene-bis(salicylaldehyde)tetramethylethlene-diimine (PMSATen), polymethylene-bis(salicylaldehyde)meso-stillbenediimine(meso-PMSAS) and poly-methylene-bis(2-hydroxyacetophenone)1,2-propylenediimine (PMHAPn) were prepared and indicated refractive index increments (dn/dc) within 0.223-0.241 at 436 nm and 0.155-0.130 at 546 nm. The data for dn/dc was obtained by extrapolating intercept of plot △n/c against concentration to zero concentration. The values of Hc/τ (τ = turbidity) were plotted against concentration and reciprocal of the intercept at zero concentration gave the molecular weight in the range of 58100-66890.The polymers were examined for reduced, intrinsic, inherent and absolute viscosities. Thermodynamic parameters as energy of activation (△Gv), heat of activation (△Hv) and entropy of activation (△Sv) of viscous flow were calculated at different temperatures. |
| URI: | http://142.54.178.187:9060/xmlui/handle/123456789/19882 |
| ISSN: | 0253-5106 |
| Appears in Collections: | Issue 02 |
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|---|---|---|---|---|
| 791-3370-1-RV.htm | 122 B | HTML | View/Open |
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