A preliminary characterization of the crystalline structure of syndiotactic poly(4-methy-1-1-pentene) is presented. X-ray diffraction patterns of powder and fiber samples are reported. On the basis of X-ray diffraction data as well as conformational energy calculations, a helical chain conformation with a sequence of dihedral angles of the kind almost-equal-to (TTGG)n having symmetry s(12/7)2 and chain repetition c = 46.91 angstrom is suggested. A tetragonal unit cell with axis a = 18.03 angstrom is proposed.
Chain Conformation and Unit-cell In the Crystalline Phase of Syndiotactic Poly(4-methyl-1-pentene) / DE ROSA, Claudio; V., Venditto; G., Guerra; P., Corradini. - In: MACROMOLECULES. - ISSN 0024-9297. - STAMPA. - 25:(1992), pp. 6938-6942. [10.1021/ma00051a034]
Chain Conformation and Unit-cell In the Crystalline Phase of Syndiotactic Poly(4-methyl-1-pentene)
DE ROSA, CLAUDIO;
1992
Abstract
A preliminary characterization of the crystalline structure of syndiotactic poly(4-methy-1-1-pentene) is presented. X-ray diffraction patterns of powder and fiber samples are reported. On the basis of X-ray diffraction data as well as conformational energy calculations, a helical chain conformation with a sequence of dihedral angles of the kind almost-equal-to (TTGG)n having symmetry s(12/7)2 and chain repetition c = 46.91 angstrom is suggested. A tetragonal unit cell with axis a = 18.03 angstrom is proposed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
