A preliminary model for the crystal structure of form III of isotactic poly(4-methylpentene-1) is suggested on the basis of structure factor calculations. Chains in 4(1) helical conformations are packed in a tetragonal unit cell with axes a = 19.38 angstrom and c = 6.98 angstrom; the space group is I4(1). The polymorphic behavior of poly(4-methylpentene-1) is discussed on the basis of conformational energy calculations on the isolated chain. The presence of different modifications is in accordance with energy minima present in the conformational energy map.
Crystal-structure of Form III and the Polymorphism of Isotactic Poly(4-methylpentene-1) / DE ROSA, Claudio; A., Borriello; V., Venditto; P., Corradini. - In: MACROMOLECULES. - ISSN 0024-9297. - STAMPA. - 27:(1994), pp. 3864-3868. [10.1021/ma00092a028]
Crystal-structure of Form III and the Polymorphism of Isotactic Poly(4-methylpentene-1)
DE ROSA, CLAUDIO;
1994
Abstract
A preliminary model for the crystal structure of form III of isotactic poly(4-methylpentene-1) is suggested on the basis of structure factor calculations. Chains in 4(1) helical conformations are packed in a tetragonal unit cell with axes a = 19.38 angstrom and c = 6.98 angstrom; the space group is I4(1). The polymorphic behavior of poly(4-methylpentene-1) is discussed on the basis of conformational energy calculations on the isolated chain. The presence of different modifications is in accordance with energy minima present in the conformational energy map.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
