In:
Journal of Applied Crystallography, International Union of Crystallography (IUCr), Vol. 40, No. 1 ( 2007-02-01), p. 10-15
Abstract:
Two points of general interest in structural refinement of polymers based on internal coordinates are discussed: the chain orientation and the chain continuity. Using a proprietary computer program, based on revised approaches to these questions, the structure of polyisobutene has been reconsidered, using new X-ray diffraction measurements (Fuji image plate) and performing a structure refinement based on internal coordinates. Three refinement schemes, with a decreasing number of degrees of freedom, have been considered, with the conclusion that the distortion from the 8 3 regular helix, claimed by Tadokoro [(1979). Structure of Crystalline Polymers , p. 136. New York: Wiley-Interscience], is confirmed, though lower than supposed. The new procedures implemented for chain orientation and chain continuity work excellently.
Type of Medium:
Online Resource
ISSN:
0021-8898
DOI:
10.1107/S0021889806044955
DOI:
10.1107/S0021889806044955/db5009sup1.cif
Language:
Unknown
Publisher:
International Union of Crystallography (IUCr)
Publication Date:
2007
detail.hit.zdb_id:
218151-4