Changes in the Mechanical Properties of Silk Fabrics Modified with Epoxide and Their Relation to the Fabric Construction

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Abstract
An investigation is described in which the mechanical properties of silk fabrics treated with ethyleneglycol diglycidylether (EDGE) were measured in relation to variations in fabric structure in terms of weight gain. Their mechanical behaviour was determined in bending, in-plane shear, and compressional characteristics experiments. An examination of the mechanical properties of silk fabrics treated with EDGE led to the following conclusions. The value of the bending rigidity (B) in the weft direction clearly increased with an increase in weight gain, which suggested hardening of fabric. The value of the shearing stiffness (G) of the fabric in the warp direction remained unchanged in spite of the epoxide treatment, and the values of the shearing hysteresis (2HG) were linearly related to the weight gain. These results suggest that the observed changes in mechanical behaviour can be largely attributed to an increase in the contact pressure between warp and weft yarns.

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