The measurement of constrained elastic recovery in polymeric solutions

The application of molecular theories to the behaviour of bulk polymers in steady shear and recovery

“…[6] but with the omission of the factor 0.5 has been obtained from the Weissenberg theory which assumes that the recoverable strain is a simple shear in analogy with solid behaviour. The constrained recovery behaviour of a series of polyisobutenes has been determined by Bancro/t and Kaye (20). Fig.…”

“…The stress and optical properties of a series of polyisobutenes have been determined in steady shear flow at 25 ~ (20). Values of n 1 --n 2 and 7 were determined directly while from corresponding values of P12 and Pll --P22, tl -tz and 0 can be calculated in the usual way (21).…”