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Change in the Mechanical Properties of Liquid-Crystalline Thermoplastic Polymers at High Temperatures

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Fibre Chemistry Aims and scope

Abstract

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.

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  1. Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg

    A. V. Savitskii & I. A. Gorshkova

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  1. A. V. Savitskii
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  2. I. A. Gorshkova
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Savitskii, A.V., Gorshkova, I.A. Change in the Mechanical Properties of Liquid-Crystalline Thermoplastic Polymers at High Temperatures. Fibre Chemistry 33, 200–205 (2001). https://doi.org/10.1023/A:1012369602417

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