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- W2392376304 abstract "A polymethylmethacrylate fraction of molecular weight 2.63×10~6 has been studied by viscosity and by light scattering in an iso-refractive solvent-non-solvent system, methyla-cetate-ethanol. The results show that dlog[η]/dlog(?)~(1/2)= 3 as demanded by Flory-Fox's theoretical interpretation of intrinsic viscosity. It is shown that the solution viscosity has reached the region of Newtonian flow at low shear rates under the conditions of ordinary viscometriC determinations. The composition, of θ-solvent of the system at 25.0° has been found to be γ_ω(ethanol)=0.509. The molecular weight distribution of the sample was determined by the method of sedimentation velocity in ultracentrifuge at the vicinity of θ-temperature in acetone-ethanol. Thus a reliable polydispersity correction could be applied to the evaluation of Flory's universal constant, which gave Φ=1.6_1×10~(23), somewhat lower than generally accepted. From the integral distribution of sedimentation coefficients of the sample and the experimental values ofM_ω and [η]_θ, it is possible to evaluate K_s~* and K_θ~* in the relationss=K_s~*M~(1/2) and [η]_θ=K_θ~*M~(1/2)for a hypothetical monodisperse system. The values found for polymethylmethacrylate in θ-solvent at 25.0° are K_s~*= 3.02×10~(-15) and K_θ~*=4.59×10~(-2)." @default.
- W2392376304 created "2016-06-24" @default.
- W2392376304 creator A5057523275 @default.
- W2392376304 date "1962-01-01" @default.
- W2392376304 modified "2023-09-25" @default.
- W2392376304 title "POLYMETHYLMETHACRYLATE IN MIXED SOLVENTS V. THE RELATIONSHIP BETWEEN INTRINSIC VISCOSITY AND END-TO-END DISTANCE IN METHYLACETATE-ETHANOL" @default.
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