Conformational properties of perfluoroalkane chains. VI. Intrinsic viscosity and unperturbed dimensions of poly(decamethylene perfluorosebacate)

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 × 10⁻⁴M_v^0.70 in chloroform and (η) = 8.8 × 10⁻⁴M_v^0.50 in s-tetrachloroethane. From these data the characteristic ratio is found to be C_θ = 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).