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Connection between strength of organic complex yarns and reinforced plastics based on them

Fibre Chemistry 1989
С. Л. Баженов, А. А. Берлин, А. А. Берлин, A. M. Kuperman, �. S. Zelenskii

Summary

The strength of organoplastic composites scales proportionally with complex yarn strength tested at 30mm gauge length, while longer 500mm specimens show diminishing returns where 10% yarn strength improvement yields only 3-4% composite strength gain. Microplastic specimen testing provides the most reliable quality criterion for evaluating twisted complex yarns used in high-performance composite structures.

The evaluation of the quality of elementary filaments of poly-p-amidobenzimidazole from the breaking load of a complex yarn 500 mm long should be taken as unfortunate. Testing specimens 30 mm long can be recommended for evaluating the quality of untwisted complex PABI yarns. Increasing the strength of complex yarns 30 mm long leads to a proportional rise in the strength of an organoplastic. In testing specimens of organoplastic 500 mm long, increasing the strength of the complex yarns by 10% leads to only a 3–4% rise in the strength of the organoplastic. The strength of a microplastic is a natural quality criterion for twisted complex yarns.

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