Conformational properties of perfluoroalkane chains. VI. Intrinsic viscosity and unperturbed dimensions of poly(decamethylene perfluorosebacate)
| Autor: | G. F. Needham, Keizo Matsuo, Walter H. Stockmayer |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
chemistry.chemical_classification
Alkane Materials science Chloroform Intrinsic viscosity General Engineering Thermodynamics Polymer Characteristic ratio Viscosity chemistry.chemical_compound Crystallinity chemistry Chain (algebraic topology) Polymer chemistry Physical chemistry General Materials Science |
| Zdroj: | Journal of Polymer Science: Polymer Symposia. 71:95-100 |
| ISSN: | 1936-0959 0360-8905 |
| Popis: | Light-scattering and viscosity measurements are reported for fractions of poly(decamethylene perfluorosebacate). Intrinsic viscosity (dL/g) relationships at 25°C are [η] = 1.55 × 10−4Mv0.70 in chloroform and (η) = 8.8 × 10−4Mv0.50 in s-tetrachloroethane. From these data the characteristic ratio is found to be Cθ = 6.3 ± 0.5, indicating that the perfluoroalkane chain is not much more extended than an alkane chain. The solid semicrystalline polymer melts at 45°C, and its x-ray powder pattern suggests a structure different from that of poly(decamethylene sebacate). |
| Databáze: | OpenAIRE |
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