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Amylose Triacetate in Nitromethane—the Second Virial Coefficient by W. Banks; C.T. Greenwood is a Materials Science article available to read on EtoBox.

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The dimensionless parameter, A ~.Mw/[r~], has been obtained from measurements on amylose acetate fractions in nitromethane. These experimental results have been compared with various theoretical treatments. It has been shown that the semi-empirical equation of Krigbaum gives the best description of the experimental values. Furthermore, application of this theory gives a value for the unperturbed dimensions of amylose acetate in excellent agreement with those obtained from lightscattering and sedimentation measurements. THEORIES developed to account for the values of the second virial coefficient, A 2, of dilute polymer solutions are many in number, because of the different approximations introduced to deal with (a) interchain interactions, (b) intrachain interactions, and (c) the combination of (a) and (b). In this paper, we review these theories and apply them to the system of amylose acetate in nitromethane. ## EXPERIMENTAL AND RESULTS Linear amylose was isolated from potato starch and was subfractionated from dimethyl sulphoxide solution by the addition of butanol. The preparation of the acetate, and the physical measurements carried out on the fractions have been detailed elsew

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Author

W. Banks; C.T. Greenwood

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0014-3057)

Published

1968

Field

Materials Science (Physical Sciences)