| 释义 |
cuprammonium|kjuːprəˈməʊnɪəm|
Also erron. cupra-ammonium.
[f. L. cupr-um copper + ammonium.]
A complex ion of copper and ammonia, Cu(NH3)4++, obtained in solution by adding excess ammonium hydroxide to a solution of a cupric salt; it forms deep blue aqueous solutions which dissolve cellulose and are used industrially, esp. in the manufacture of some man-made fibres. So cuprammonium process, cuprammonium rayon, cuprammonium silk, etc. Also used ellipt. for cuprammonium solution.
1862H. Watts tr. Gmelin's Hand-bk. Chem. XV. 142 Cotton immersed in aqueous biphosphate of cuprammonium becomes first gelatinous, then slippery, and forms an almost transparent gummy liquid. 1888Cross & Bevan Paper-Making xvi. 217 The cuprammonium solution. 1907Roscoe & Schorlemmer Treat. Chem. (ed. 4) II. 435 This dissolves to a deep pure blue liquid containing cuprammonium sulphate, CuSO4, 4NH3, H2O, which was first described by Stisser in 1693 as an arcanum epilecticum and afterwards termed cuprum ammoniacale. 1921T. Woodhouse tr. Foltzer's Artif. Silk 29 Despeissis Artificial Silk (Cuprammonium Process). Ibid. 36 Cuprammonium Solution..is a solution of copper oxide in ammonia. It is a blue liquid known to chemists as Schweitzer's reagent. 1925Good Housekeeping Apr. 142/2 Cuprammonium silk. 1927M. H. Avram Rayon Industry 192 The cupra-ammonium solution of cellulose. Ibid. 497 Cupra-ammonium Rayon. 1939Thorpe's Dict. Appl. Chem. (ed. 4) III. 355/1 ‘Schweizer's reagent’ or cuprammonium..has the property of dissolving cellulose (cotton wool, linen, filter paper, etc.). 1960Wood & Holliday Inorg. Chem. xiv. 347 The deep blue solution of cuprammonium sulphate deposits crystals..of composition, Cu(NH3)4SO4.H2O. 1964N. G. Clark Mod. Org. Chem. xvi. 333 One commercial process, giving Cuprammonium Rayon, exploits the ability of an aqueous ammoniacal copper salt solution to dissolve cellulose. |