A rheometer with two-dimensional area detection for light scattering studies of polymer melts and solutions

TitleA rheometer with two-dimensional area detection for light scattering studies of polymer melts and solutions
Publication TypeJournal Article
Year of Publication1992
AuthorsNakatani, Alan I., Waldow Dean, and Han Charles C.
JournalReview of Scientific Instruments
Volume63
Issue7
Pagination3590-8
AbstractA combined rheometer and light scattering photometer is constructed to examine the light scattering behavior of polymer melts and solns. under the influence of a simple shear field. The device utilizes a special lens system and a 2-dimensional charge-coupled device array detector which has not been used previously in an app. of this type to quant. measure the scattering intensity as a function of shear rate. The accessible q range of the instrument is from 3.75 .times. 10-4 to 3.0 .times. 10-3 nm-1 (2.2.degree.-17.4.degree. scattering angle, with .lambda. = 632.8 nm). The rheometer uses a cone and plate geometry to generate the shear gradient and is capable of measuring torque (1.8 N m max.) and normal forces (50 N max.). An 8% soln. of a 50:50 polystyrene/polybutadiene blend in dioctyl phthalate was used to test the app. This sample shows a shear-induced mixing behavior which is consistent with previous measurements by other investigators.