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Nauk. SSSR 146, 368 (1962). , J. Am. Chem. Soc. 78, 2656 (1956). (25) Tobolsky, Α. , Rogers, C. E . , J. Polymer Sci. 40, 73 (1959). (26) Worsfold, D . , J. Chem. Soc. 1960, 5234. (27) Worsfold, D . , Can. J. Chem. 38, 1891 (1960). (28) Worsfold, D . , Makromol Chem. 65, 245 (1963). (29) Worsfold, D . , Can. J. Chem. 42, 2884 (1964). ch004 R E C E I V E D February 11, 1965. C. No. 8661. ; Advances in Chemistry; American Chemical Society: Washington, DC, 1966. 5 Electron Donors in Diene Polymerization W.
The fact that they are amorphous indicates that they are constituted of cis-1,4 isotactic sequences which are not sufficiently long to give rise to crystallinity detectable by x-ray. Characterization and Structure of the cis-1,4 Polypentadienes IR spectra of the cis-1,4 isotactic or syndiotactic polymers, in the molten state or in solution, and of the amorphous polymers are practically identical. " (cis double bonds). In the spectra of the solid isotactic or syndiotactic polymers, however, new bands appear which are typical of the crystallinity of the polymers (Figure 1 and 2).