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Crystalline phase orientation in biaxially stretched isotactic polypropylene films
Author(s) -
Rizzo Paola,
Venditto Vincenzo,
Guerra Gaetano,
Vecchione Antonio
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200208)185:1<53::aid-masy53>3.0.co;2-n
Subject(s) - tacticity , materials science , monoclinic crystal system , polypropylene , crystallinity , composite material , polymer , phase (matter) , orientation (vector space) , polymer chemistry , polymer science , crystallography , crystal structure , polymerization , organic chemistry , geometry , chemistry , mathematics
The different kinds of crystalline orientations which can occur in industrially relevant isotactic polypropylene (i‐PP) films are compared with those generally observed for other semicrystalline polymers. The peculiar bimodality typical of the uniplanar‐axial orientation which is present in two‐step biaxially stretched i‐PP films is rationalized in terms of the two alternative stackings on the (0k0) face of bilayers of macromolecules of the monoclinic unit cell.