Abstract
A preliminary characterization of the crystalline structure of syndiotactic poly(4-methyl-1 pentene) is presented. X-ray diffraction patterns of powder and fiber samples are reported. On the basisof X-ray diffraction data as well as conformational energy calculations, a helical chain conformation with a sequence of dihedral angles of the kind ≃(TTGG) n having symmetry s(12/7)2 and chain repetition c=46.91 A is suggested. A tetragonal unit cell with axis a=18.03 A is proposed
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