| 释义 |
xanthation Chem.|zænˈθeɪʃən|
[f. xanthate + -tion.]
A stage in the viscose process for making rayon, in which alkali-cellulose is treated with carbon disulphide to form cellulose xanthate.
1927T. Woodhouse Artificial Silk iv. 30 The larger quantity of Viscose silk is made from wood-pulp... This process is termed Xanthation. 1962J. T. Marsh Self-Smoothing Fabrics iv. 30 When xanthation is complete, the solid is dissolved in dilute caustic soda. 1978Nature 12 Oct. 530/1 Mechanically pulped wood or papers are not generally useful, as the structure resists solution after xanthation.
So ˈxanthate v. trans., to cause to undergo xanthation; also absol.; xanˈthated ppl. a., xanˈthating vbl. n.
1938Thorpe's Dict. Appl. Chem. (ed. 4) II. 465/2 Surplus carbon disulphide is removed..and the xanthated crumbs are then dispersed by churning with NaOH solution. 1952U.S. Patent 2,592,355 1 In manufacturing viscose-rayon fiber, a low cellulose, high alkali and low viscosity is prepared..by xanthating and dissolving same in usual way. Ibid. 4 Without subjecting to aging, it is xanthated in a xanthating apparatus. 1962J. T. Marsh Self-Smoothing Fabrics iv. 30 The crumbs of alkali-cellulose are then xanthated by treatment with carbon disulphide in a rotating churn for about 3 to 4 hr. 1964V. E. Yarsley et al. Cellulosic Plastics x. 149 The xanthated cellulose. Ibid., The aged alkali-cellulose is charged to the xanthating churns, which rotate slowly. 1978Jrnl. Appl. Polymer Sci. XXII. 897 Starch polyampholytes (xanthated starch amines)..were prepared, characterized, and evaluated as wet- and dry-strength agents in paper handsheets. 1983Jrnl. Macromolecular Sci.: Chem. A. XX. 218 Partially xanthated cellulose. |