Concentrated solutions of poly(vinyl acetate)/toluene and poly(dimethyl siloxane)/octane were investigated in the polymer volume fraction range 0.08 ~ Β’ ~< 0.5 using small angle X-ray scattering. As the concentration increases the polymer-polymer correlation length deviates increasingly from the pre
Rayleigh light scattering in concentrated polymer solutions above the cloud point
β Scribed by E. Geissler; A.M. Hecht
- Publisher
- Elsevier Science
- Year
- 1976
- Tongue
- English
- Weight
- 479 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
β¦ Synopsis
Optical heterodyne scattering measurements are presented for concentrated solutions of unreticulated cis-polybutadicnc as a function of temperature. For a heptane volume fraction v, the second derivative of the free energy with respect to concentration varier approximately as u-z.9 (T-7,). where T, is the spinodal temperature.
π SIMILAR VOLUMES
Dynamic light-scattering measurements have been made on the ''soft'' polymer: poly(n-laurylmethacrylate) (PLMA) in solution in ethyl acetate over the concentration range 0.1 Γ΅ C Γ΅ 0.9 g/mL as well as melt PLMA. With the concentrated solutions, the hydrodynamic screening length (j h ) scales with an
Polyisobutene (PIB) dissolved in saturated hydrocarbons was degraded by irradiation with 2 ,us impulses of 15 MeV electrons. The time dependence of the change of light-scattering intensity (LSI) (due to the decrease of molecular weight) was measured. The half life r I,\_,(LS) of the decrease of LSI