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Crystalline Structure of Isotactic Poly(vinylcyclobutane) from Fiber Diffraction Spectra

Title data

Immirzi, Attilio ; Tedesco, Consiglia ; Venditto, Vincenzo ; Recupero, Domenico ; van Smaalen, Sander:
Crystalline Structure of Isotactic Poly(vinylcyclobutane) from Fiber Diffraction Spectra.
In: Macromolecules. Vol. 33 (2000) Issue 1 . - pp. 125-129.
ISSN 0024-9297
DOI: https://doi.org/10.1021/ma990296x

Official URL: Volltext

Abstract in another language

The crystalline structure of isotactic poly(vinylcyclobutane), claimed to be tetragonal, has been revised on the basis of fiber diffraction spectra. The chain symmetry is 41, as already assessed, but the conformation is different (the identity period is 6.91 Å and not 6.60 Å). The space group is the orthorhombic P212121 with lattice constants a = 17.14 Å, b = 8.99 Å, and c = 6.91 Å. The excellent quality of the oriented samples allowed a full structure analysis and refinement. Integrated diffraction intensities, from a stretched fiber, measured with a Fuji image plate detector, have been utilized in a constrained refinement (the helix was assumed strictly of 41 symmetry and the C−C bond lengths were set to 1.54 Å) obtaining a final R index of 15%. The refined chain bond angles are 103 and 107°, and the chain torsion angles are 165 and 273°.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography > Chair Crystallography - Univ.-Prof. Dr. Sander van Smaalen
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 23 Mar 2016 10:08
Last Modified: 23 Mar 2016 10:08
URI: https://eref.uni-bayreuth.de/id/eprint/32009