Portal de Periódicos da CAPES

Properties of polymer solutions

1967; Wiley; Volume: 16; Issue: 5 Linguagem: Inglês

10.1002/polc.5070160523

1935-3065

C. Rossi, E. Bianchi, Enrico Pedemonte,

Material Dynamics and Properties

Abstract According to the present theories, the Flory‐Mandelkern invariant F should assume values between 1.65 and 1.75 × 10 −9 for medium and high molecular weights, and increase up to about 3 × 10 −9 for very low molecular weights. By using experimental data on [ η ], M , and D deduced from the literature, we get a set of scattered F values, ranging from 1.40 to 1.60 and independent of molecular weight. Measurements carried out in our laboratory on polystyrene in benzene and on polyisobutylene and cyclohexane give F values independent of molecular weight in the range 10 3 –10 5 . The dependence of the F values upon the solvent, as observed in our experiments, is explained as due to differences in the effects of the solvent on the viscosity as compared to the diffusion.