Epitaxial and graphoepitaxial growth of isotactic polypropylene (iPP) from the melt on highly oriented high density polyethylene (HDPE) substrates
✍ Scribed by Shouke Yan; Frank Katzenberg; Jürgen Petermann
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 288 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0887-6266
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✦ Synopsis
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 compared 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 of HDPE/iPP with their chains 50°apart, two new orientation relationships with (a) chains of both polymers parallel and (hk0) iPP in contact with 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 were observed. Both orientations are assumed as graphoepitaxy.