| 释义 |
syndiotactic, a. Chem.|ˌsɪndaɪəʊˈtæktɪk|
Also (more correctly) syndyo-.
[f. Gr. σύνδυο two together + τακτ-ός arranged, ordered + -ic.]
Having or designating a polymer structure in which the substituent groups alternate on either side of the backbone of the molecule.
1956Natta & Corradini in Jrnl. Polymer Sci. XX. 262 We propose to call all vinyl polymers with alternating d- and l-configurations of their substituents (like 1,2-polybutadiene) ‘syndyotactic’ polymers. 1966McGraw-Hill Encycl. Sci. & Techn. X. 478/2 Isotactic and syndyotactic (stereoregular) polymers are formed in the presence of complex catalysts. 1972Physics Bull. Nov. 668/3 The cellulose molecule..is syndiotactic and hence able to crystallize. 1978Nature 9 Feb. 508/2 Commercial atactic polystyrene..is 70% syndiotactic.
Hence ˌsyndioˈtactically adv.; ˌsyndiotacˈticity, the property or state of being syndiotactic.
1959Jrnl. Polymer Sci. XXXIV. 9 Syndiotacticity is the corresponding arrangement. We can think of it as composed of positional and structural arrangements identical to those of isotacticity (repetition arrangements) and of a tacticity opposite to that of isotacticity (inversion tacticity). 1964Ibid. B. II. 319 Predominantly isotactic addition may occur on heterogeneous surfaces, accompanied by conversion of the active complexes to form different..catalyst sites, which propagate predominantly syndiotactically. 1974Nature 26 Apr. 758/1 If there is a high degree of syndiotacticity, a structure incorporating four monomer units per fibre repeat may be present. syndirsyndocsyndon |