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A rhes-light-scattering instrument for the study of the phase behavior of polymer blends under simple-shear flow

A rheo-light-scattering instrument for investigating the influence of shear on the phase behavior of polymer blends was constructed from a commercial parallel-plate rheometer. Laser light scattering from the sample plane formed by the flow and vorticity directions was projected on a screen, and a combination of a camera lens and a charge-coupled device detector was used to record the scattering pattern. The rheometer, which can generate angular velocities of up to 100 rad/s and measure torque and normal forces up to 9.8X103 N m and 9.8X10’ N, respectively, is suitable for studying polymer melts at stresses up to 9.1 kPa. The maximum accessible 4 range was from 5.72X 10m4 to 7.11 X 10m3 nm-’ (3”-42” scattering angle and a laser wavelength of X=632.8 nm). The performance of the light-scattering instrumentation and the accuracy of the correction algorithms were tested with a Ronchi ruling diffraction grating and a olloid of monodisperse polystyrene spheres. Example rheo-light-scattering measurements were made with a 50/50 blend of polystyrene and polyisobutylene oligomers and a 40160 blend of polybutadiene and polyisoprene. All components had narrow molecular weight distributions. The first blend exhibits an upper critical solution temperature while the second blend shows a lower critical solution temperature.