The Investigation of the Properties of Nitrocellulose Molecules in Solution by Light-Scattering Methods. II. Experimental Results and Intepretations.

Abstract

Techniques and instruments developed in this laboratory for the determination of the sizes and shapes of high-polymer molecules by the light-scattering method n-ere described in a prerious paper (a), which in the following will be referred t o as Paper S o . I. The present paper describes the application of these methods t o a study of a series of nitrocellulose fractions which has resulted in rather definite conclusions regarding the character of the nitrocellulose molecule in solution. The results obtained from the light-scattering measurements are correlated n-ith viscosity and diffusion data by the use of recently developed theories.

Molecular Dimensions of Cellulose Triesters1

“…(lo) H. Tompa, Trans. Faraday Soc., 46, 1142(1949. mixture on molecular weight and on polymer concentration.…”

Sedimentation Equilibria of Polydisperse Non-Ideal Solutes. IV. Association ;n Di-lute Cellulose Acetate Solutions.

“…From the results of this work, it can be seen that it is possible that the apparent decrease in axial ratio observed for cellulose acetate (3,18) and nitrate (2) at high molecular weights could be caused by interor intramolecular crosslinking between sulfuric acid half-ester groups. For such an effect to be completely absent, it would be required that all of the sulfate-rich material be removed in the initial fraction.…”

Intrinsic Viscosities and Molecular Weights of Cellulose and Cellulose Derivatives

“…Dimensions for Cellulose Nitrate in Acetone [Calculated byBadger and Blaker(1)] Molecular Dimensions…”