Stirring-induced solution crystallization of ultra high molecular weight polyamide 6
| Autor: | H. L. Doppert, J. G. Van Dijk |
|---|---|
| Rok vydání: | 1988 |
| Předmět: |
chemistry.chemical_classification
Yield (engineering) Polymers and Plastics Chemistry Scanning electron microscope General Chemistry Polymer Surfaces Coatings and Films law.invention Differential scanning calorimetry Chemical engineering law Polyamide Polymer chemistry Materials Chemistry Melting point Fiber Crystallization |
| Zdroj: | Journal of Applied Polymer Science. 36:1177-1189 |
| ISSN: | 1097-4628 0021-8995 |
| DOI: | 10.1002/app.1988.070360518 |
| Popis: | Unstable solutions of ultrahigh molecular weight polyamide 6 have been prepared by adding a nonsolvent to the polymer solution. Crystallization of the polyamide from such a solution proceeds very slowly. It has been found, however, that vigorous stirring of the unstable solutions induces rapid fibrous crystallization of the polymer. The fiber mat consists of irregularly shaped fibers. A low temperature and a high stirring rate are among the conditions necessary to obtain a high yield of fibrous material. The fibers formed upon stirring have a higher molecular weight than the polyamide 6 molecules which remain in the solution. The melting point of the fibers depends on the speed of the paddle stirrer. The differential scanning calorimetry (DSC) thermogram reveals higher melting temperatures of the fibrous material if higher stirring rates have been applied. |
| Databáze: | OpenAIRE |
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