Characterization of poly(diethoxyphosphazene) by size exclusion chromatography and viscometry |
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Authors: | Maria P Tarazona Julio Bravo Maria M Rodrigo Enrique Saiz |
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Affiliation: | (1) Departamento de Química Física, Universidad de Alcalá de Henares, E-28871 Alcalá de Henares, Madrid, Spain |
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Abstract: | Two samples of poly(diethoxyphosphazene) (PDEP) having very different molecular weights have been studied by viscometry and size exclusion chromatography in THF solution. The results obtained, together with light scattering data of these samples, allow the calculation of the Mark-Houwink constants a=0.65 and K=2.5 10-4 in THF at 25°C. The method of calculation employed takes into account the great polydispersity of the samples. The characteristic ratio of the unperturbed dimensions was also calculated giving Cn = r2 o/n 2 18, a value slightly higher than those previously reported for poly(dihexoxyphosphazene), Cn 13 and poly (dichlorophosphazene), Cn 13.5. |
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