Morphology and Thermal Properties of Fully Syndiotactic Polypropylene
| Autor: | Donald D. Davis, Bernard Lotz, Andrew J. Lovinger, Martina Schumacher |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Polypropylene
Materials science Yield (engineering) Morphology (linguistics) Polymers and Plastics Organic Chemistry law.invention Inorganic Chemistry chemistry.chemical_compound Transverse plane chemistry law Tacticity Thermal Polymer chemistry Materials Chemistry Crystallization Composite material Thin film |
| Zdroj: | Macromolecules. 27:6603-6611 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma00100a053 |
| Popis: | The morphology of syndiotactic polypropylene (sPP) containing >99% racemic diads has been investigated following controlled crystallization from the melt in thin films. At high growth temperatures, large rectangular single crystals are obtained with preferred growth along the crystallographic b-axis, while at lower temperatures these branch out to yield dendritic, axialitic, and eventually spherulitic aggregates. These crystals exhibit two very unusual properties: transverse fractures and ripples. Both are quasi-periodic, the fractures with a spacing of 3-7 μm and the ripples generally 1 μm or less |
| Databáze: | OpenAIRE |
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