Structure and optical activity of a crystalline modification of isotactic poly‐(S)‐4‐methyl‐1‐hexene
作者:
I. W. Bassi,
O. Bonsignori,
G. P. Lorenzi,
P. Pino,
P. Corradini,
P. A. Temussi,
期刊:
Journal of Polymer Science Part A‐2: Polymer Physics
(WILEY Available online 1971)
卷期:
Volume 9,
issue 2
页码: 193-208
ISSN:0449-2978
年代: 1971
DOI:10.1002/pol.1971.160090201
出版商: John Wiley&Sons, Inc.
数据来源: WILEY
摘要:
AbstractThe results of an x‐ray and polarimetric study of a crystalline modification (form I) of isotactic poly‐(S)‐4‐methyl‐1‐hexene are reported and discussed. The x‐ray fiber spectra of this polymer are practically indistinguishable from those of isotactic poly‐(R)‐(S)‐4‐methyl‐1‐hexene. Although the crystal structure of the latter can be described on the basis of helices of different screw sense packed in aP4space group, the crystal structure of poly‐(S)‐4‐methyl‐1‐hexene is better described on the basis of aP1space group. The conclusion of the x‐ray investigation, that in the crystals of the optically active polymer an equal number of right‐handed and left‐handed helices must be present, is supported by the polarimetric measurements, which have shown that the polymer in the crystalline for
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