Structure of Cellulose Acetate


RECENTLY I have examined several samples of cast plasticized secondary cellulose acetate sheet material under the microscope. With crossed nicols a uniform yellow polarization colour was shown, indicating a considerable amount of orientation. Taking the casting flow-lines, parallel to the ‘selvedge’ edge, as the direction of the c axis, the samples showed oblique extinction. This phenomenon is consistent with the view that the cellulose acetate unit, and also the parent cellulose, is monoclinic rather than orthorhombic.

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REDFARN, C. Structure of Cellulose Acetate. Nature 145, 515 (1940).

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