✦ LIBER ✦

The crystal structure of trans polyalkenamers

✍ Scribed by G. Natta; I.W. Bassi

Book ID: 103069923
Publisher: Elsevier Science
Year: 1967
Tongue: English
Weight: 524 KB
Volume: 3
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(67)90081-x

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✦ Synopsis

The structure of crystalline trans polyheptenamer [--CH~--------CH--(CHz)y--]tt has been determined by the X-ray diffraction spectra given by cold drawn fibres. The fibre repeat is 17.10 A and comprises two chemical units. The unit cell is orthorhombic, with two chains per cell. The cell dimensions are: a = 7-40 A; b = 5.00 A; c = 17"10 A; space group D~6 (p n a m).

The a and b axes and the packing of the chains of trans polyheptenamer are very similar to those found for crystalline trans polypentenamer [--CH~CH--(CH2)3--]n and for orthorhombic polyethylene.

The carbon atoms of the polymeric chain lie on two separate planes, running parallel to the chain axis. A different crystalline modification of trans polyheptenamer has been observed in some i.r. spectra.

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