GRAFT COPOLYMERS OF STYRENE AND METHYL METHACRYLATE: PART II: VISCOSITY BEHAVIOR
Open Access
- 1 August 1956
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Chemistry
- Vol. 34 (8), 1027-1036
- https://doi.org/10.1139/v56-136
Abstract
A study of the viscosity behavior of the graft copolymers described in Part I has been made with dilute solutions in benzene at 25 °C. Although the slope constants of the Huggins equation increase with the frequency of branching when measurements are made in a capillary viscometer under 'free fall' conditions, this is shown to be attributable to the dependence of viscosity on shear gradient. At a constant shear rate, the Huggins k′ values approximate to those of linear polymers. It is suggested that the marked increase in viscosity observed with decreasing shear rate for the graft copolymers is due to molecular entanglement.Keywords
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