stereoregulate, v. Chem.
(stɛriːəʊ-, stɪəriːəʊˈrɛgjʊleɪt)
[f. stereo- + regulate v.]
trans. To cause (a polymerization or its product) to be stereoregular. So ˌstereoˈregulated ppl. a., -ˈregulating vbl. n. and ppl. a.; ˌstereoreguˈlation.
| 1959 Gaylord & Mark Linear & Stereoregular Addition Polymers 476 Even the application of free radicals as initiators does not rule out the formation of stereoregulated addition polymers. Ibid. 478 The propagation reaction will be stereoregulated or stereocontrolled and the polymer will be tactic, which means that the individual monomers in the chain will overwhelmingly be added in one of the different possible ways and the resulting macromolecule will display stereospecificity, i.e., a high degree of internal orderliness. Ibid., Experience..has shown that stereoregulating effects are strongest in the case of Ziegler-type catalysts. Ibid. 479 It appears that a methyl group at the alpha carbon atom is favorable for stereoregulation. 1961 Industr. Chemist Feb. 73/1 (heading) Nature of the stereoregulating catalysts. 1962 E. L. Eliel Stereochem. Carbon Compounds xv. 448 The ‘stereoregulated’ (i.e. isotactic or syndiotactic) polymers have higher densities, higher melting points, and lower solubility than the atactic polymers. 1976, 1979 Stereo-regulating, -regulation [see stereoregularity]. 1979 C. H. Bamford in R. N. Haward Developments in Polymerisation II. 249 The stereoregulating influence of added prepolymers has been shown to be more pronounced at lower temperatures. |