4—Extensometric and Elastic Properties of Textile Fibres

Abstract

Load-extension and elastic recovery results are given for some sixty fibre samples tested under three conditions-air dry, immersed in cold water, and immersed in hot water. Fifteen chemical classes of man-made fibre are represented, with some natural fibres for comparison. The effect of a pretreatment in hot water on the tensile behaviour of the fibres in air is also examined. Some of the synthetic-polymer fibres contract greatly on treatment and their extensometric properties are much modified. Wetting tends to eliminate the initial, high modulus, region of the load-extension curve and temperature rise may cause a similar change. In general, these two factors also affect elastic recovery In the same way, bringing about an increase of recovery from imposed strain.