| Autor: | I. A. Gorshkova, A. V. Savitskii |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
chemistry.chemical_classification
Materials science Annealing (metallurgy) General Chemical Engineering Young's modulus General Chemistry Polymer Polyester symbols.namesake chemistry Ultimate tensile strength symbols Melting point General Materials Science Crystallite Composite material Thermoplastic polymer |
| Zdroj: | Fibre Chemistry. 33:200-205 |
| ISSN: | 0015-0541 |
| DOI: | 10.1023/a:1012369602417 |
| Popis: | The change in the modulus of elasticity and tensile strength of initial and heat-treated liquid-crystalline polyester fibres after annealing at a temperature 20-40°C higher than the melting point of the crystallites in the polymers was investigated. It was shown that from 50 to 90% of the initial values of the strength characteristics were preserved. In heating above the melting point of the crystallites, LC polyester fibres can melt into a monolith with preservation of elevated mechanical properties, which permits production of self-reinforced composites. The fibres melt as a result of cooperative molecular movement, and preservation of the strength indexes is ensured by the cross-links formed at high temperatures. Selection of the temperature—time conditions of heat treatment and molding is especially important for production of high-strength self-reinforced composites by melting of LC polyester fibres into a monolith. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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