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Citation: Liu Xiaochun, Yang Decai, Feng Zhiliu. ON THE MORPHOLOGY OF HIGHLY ORIENTED FILMS OF iPP/HDPE BLENDS[J]. Chinese Journal of Applied Chemistry, ;1990, 7(1): 43-48. shu

ON THE MORPHOLOGY OF HIGHLY ORIENTED FILMS OF iPP/HDPE BLENDS

1.
Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022

Received Date: 1 February 1989
Available Online: 13 May 1989

The morphology of highly oriented melt-drawn films of iPP/HDPE blends has been investigated by TEM and DSC. Both the HDPE and the iPP in the films consist of hig-hly oriented crystalline lamellae. Blending iPP with HDPE results in decrease of crystal-line width and melting point of HDPE, as well as the change of HDPE texture from a single crystal texture to fibre symmetric structure. No marked phases of iPP were found in the films at low iPP contents(<20%). Individual phases of iPP were observed at iPP contents>30% .There is no sharp boundary between the two phases. The lamellae of HDPE and iPP in the boundary region are higher interpenetrating or connecting each other. When the preparation temperature of the film is higher(135-140℃) and the content of HDPE in the blends is below 30%, epitaxial growth of HDPE lamellae on highly oriented iPP lamellae has been observed. The intercrossing angle of the two kinds of epitaxial la-mellae is about 45°-50°, while the contact planes are (010) of iPP and(100) of HDPE.
- polypropylene,
- polyethylene,
- blends,
- morphology,
- epitaxy
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