Showing papers by "Guy C. Berry published in 1977"
TL;DR: In this paper, light scattering and elasticity of thermally reversible gels of cellulose acetate in benzyl alcohol over a range of temperature and polymer concentration were investigated. And the authors concluded that the scattering has its origin in the nonrandom character of the crosslinking in the gels studied.
Abstract: Kinetic studies are reported for the light scattering and elasticity of thermally reversible gels of cellulose acetate in benzyl alcohol over a range of temperature and polymer concentration. The small-angle light scattering data are found to be described by exponential correlation functions, and it is concluded that the scattering has its origin in the nonrandom character of the crosslinking in the gels studied. The elasticity is discussed in terms of the density of crosslinks in the gels. Thus, the kinetics studied by light scattering and elasticity measurements are independently related to temperature and polymer concentration.
16 citations
01 Jan 1977
TL;DR: In this paper, the persistence length ρ, the optical anisotropy δ and certain other molecular parameters are considered and the results for several examples are given; the effect of intermolecular aggregation on estimates for these parameters is important in some cases.
Abstract: The salient features of investigations on several polymers characterized by long, rigid sections in the chain skeleton are discussed. Procedures to estimate the persistence length ρ, the optical anisotropy δ and certain other molecular parameters are considered and the results for several examples are given. The effect of intermolecular aggregation on estimates for these parameters is important in some cases. Some rheological properties of concentrated solutions of certain of the polymers are discussed. The behavior of both optically isotropic and anisotropic solutions of rodlike polymers is included, along with the properties of a chain that can be described as a rigid coil molecule. Emphasis is on the dependence of the steady state viscosity ηK on shear rate K, the recovery function RK for recoverable strain γ K R after cessation of steady state flow (RK = γ K R /KηK) and the creep behavior.
7 citations