| 释义 |
ˌpolycondenˈsation Chem.
Also poly-condensation.
[ad. G. polykondensation (H. Staudinger Hochmolekularen Verbindungen (1932) ii. 255): see poly- and condensation.]
A condensation reaction between molecules each having at least two functional groups which yields a polymer, or a process based on such a reaction. Freq. attrib.
1936Trans. Faraday Soc. XXXII. 52 The formation of high polymeric products can also take place by a polycondensation process in which numerous reactive molecules condense. 1949Jrnl. Textile Inst. XL. a307 Polycondensation products, such as phenolic plastics, phenolacetylene resins, urea-formaldehyde resins, linear and branched polyesters, and super polyamides. 1962Times 26 Feb. (Canada Suppl.) p. vii/2 (Advt.), Complete chemical plant and equipment including plant for thermosetting and thermoplastic polymers and synthetic fibres from polymers and polycondensation products. 1963A. J. Hall Textile Sci. ii. 79 It [sc. nylon] is made by the melt-spinning of polyhexamethylene adipamide which in its turn is produced by the polycondensation of equimolecular proportions of adipic acid..and hexamethylene diamine. 1971Jrnl. Oil & Colour Chemists' Assoc. LIV. 888 The volatile components (solvents, monomers and low molecular weight poly condensation products) evaporate almost completely from the liquid paint during the process of film formation. 1978Nature 29 June 738/2 Polymers of related structures have long been known, however, prepared by polycondensation of alkali metal polysulphides and α, ω-dihaloalkanes.
Hence (as back-formations) polyconˈdense v. trans., to cause to undergo polycondensation; polyconˈdensed ppl. a. Also polyˈcondensate [after filtrate, precipitate, etc.], a product or preparation resulting from polycondensation.
1942Jrnl. Amer. Chem. Soc. LXIV. 2269/2 The results..show that the poly-condensates are built up quantitatively from alanine units linked by {b1}CONH{b1} bonds. 1967Immunochem. IV. 77 (heading) Sensitization of erythrocytes by polycondensed proteins of immune serum and their use for determining antigen content. 1968J. Chambion in H. F. Mark et al. Chem. Man-Made Fibers II. 448 For higher homologs of polyamide 6, the corresponding monomer amino acid can be polycondensed. 1971B. Buck tr. Ludewig's Polyester Fibres iv. 90 The whole process from dissolution to extrusion can be carried out in one single apparatus in which the dimethyl terephthalate is dissolved in glycol, transesterified, and polycondensed. Ibid. 125 Moisture promotes degradation of the polyester melt in the further processing of the polycondensate. 1976Nature 6 May 76/3 Structures..much more easily oxidisable than polycondensed aromatics. |