Epitaxial and graphoepitaxial growth of isotactic polypropylene (iPP) fromthe melt on highly oriented high density polyethylene (HDPE) substrates

Citation
S. Yan et al., Epitaxial and graphoepitaxial growth of isotactic polypropylene (iPP) fromthe melt on highly oriented high density polyethylene (HDPE) substrates, J POL SC PP, 37(15), 1999, pp. 1893-1898
Citations number
15
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
ISSN journal
08876266 → ACNP
Volume
37
Issue
15
Year of publication
1999
Pages
1893 - 1898
Database
ISI
SICI code
0887-6266(19990801)37:15<1893:EAGGOI>2.0.ZU;2-N
Abstract
Although under normal conditions only the crystallization behavior of PE on oriented IPP substrates can be studied due to the higher melting point of iPP, the faster crystallization rate of a molten, oriented HDPE film compar ed to a nonoriented IPP layer was used to study the crystallization of iPP on the oriented HDPE film by means of transmission electron microscopy (TEM ) and electron diffraction (ED). Besides the known epitaxial relationship o f HDPE/iPP with their chains 50 degrees apart, two new orientation relation ships with (a) chains of both polymers parallel and (hk0)(iPP) in contact w ith the HDPE substrate, and (b) the a-axis of iPP crystals parallel to the chain direction of HDPE but (001)(iPP) in contact with the HDPE substrate w ere observed. Both orientations are assumed as graphoepitaxy. (C) 1999 John Wiley & Sons, Inc.