New PDF release: Applied crystallography

By Henryk Morawiec; Danuta Stróż

ISBN-10: 9812387617

ISBN-13: 9789812387615

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Sample text

The presence of methyl groups in the small crystalline aggregates of EP copolymers necessarily introduces some conformational disorder. The conformational disorder consists in small deviations of the backbone dihedral angles close to the pendant methyl groups from 180°; these deviations from the trans state alleviate intramolecular and intermolecular strains and are easily digested in the pseudo-hexagonallattice of EP copolymers. 54 A, would be rather wavy as a consequence of the presence of conformational disorder.

Depending on the succession of the configurations R and S the meso diads may assume Z- or S-shapes (A,B), whereas the racemic diads may assume aC shape with different orientation (C,D). (Reprinted with permission from [121]. 5 A (Fig. 20) [121 , 207]. Various kinds oflimit-ordered and limit-disordered model structures have been proposed, arising from the packing of diisotactic and disyndiotactic chains, while maintaining long-range order in the average positioning of the norbornene rings, placed at the nodes of a face-centered lattice [207].

Conformational disorder accounts for the experimental ratio between the integrated intensities of the main peaks on the first layer line and on the equator. 1. 42 F. Auriemma et al. 3. A local structure similar to ideal orthorhombic- and monoclinic-like structures shown in Fig. 15A and Fig. 15B,B' is retained at short-range distances, up to few tens of angstroms (2-3 times the lattice parameters). In other terms, on a local scale, the chains are arranged according to the orthorhombic-, monoclinic- or triclinic-like models of Fig.

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Applied crystallography by Henryk Morawiec; Danuta Stróż

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