COAGULATION EFFECT ON STRUCTURES OF REGENERATED CELLULOSE: PART 1. STUDIES ON MODEL CELLULOSE GELS COAGULATED BY TWO-BATH TREATMENT FROM VISCOSE

The present examination refers to cellulose gels coagulated freely by the procedure by which the formation process is broken up into individual phases:- (1) gelatination of viscose, and (2) regeneration of this xanthate gel to cellulose itself. Fine structuves of both fresh and dry gels, such as equilibrium absorption of dye, accessibility and lateral-order distribution, were investigated with regard to various conditions of Na2SO4 and H2SO4 baths or to various degrees of ripeness of viscose respectively, and following fundamental concepts were obtained: Degree of changes in gel structure during shrinking process of drying depends upon a degree of order of chaines in the less orderly regions of fresh gel, although the specific character of fresh gel is retained after its shrinkage. The structure of xanthate gel frame, built up primarily beforer egeneration, plays the decisive part in relation to the structure of cellulose gel resulting from it by regenerating and drying.