No abstract

No abstract

No abstract

A review is given of physicochemical studies on cellulose and cellulose derivatives made during the years of World War II at the Institute of Physical Chemistry, Uppsala, Sweden. Emphasis has been laid on the principles of the subject and the review deals essentially with some investigations on nitrocellulose by the present author. An outline of the problems of the cellulose chemistry of today serves as an introduction. The principles of molecular weight determinations from Svedberg's equation are briefly mentioned, and the difficulties in the extrapolation of sedimentation constants to zero concentration are discussed. The problem of what sort of average molecular weight is obtained from Svedberg's equation is treated subsequently and methods for determination of distributions from combinations of osmotic and sedimentation experiments described. A table comparing five different sorts of average molecular weights for a numbe of nitrocelluloses is discussed.

No abstract