Abstract
Tenisle strength and elongation of P. V. A. fibres with various quantities of Tetramethylene Diisocyanate (T. M. D.) was examined.It was found that the relation between their tensile properties and T. M. D. content is similar to that between the tensile properties and sulphur content in vulcanzied rubber. This phenomenon is probably due to Diurethane cross-linkage formed between P. V. A. molecules.Among several series of the treated fibre swollen to various degrees in the pretreatement, the above tendency was more remarkable, where the swelling is greater. The less swelling, the less T. M. D. content gave rise to the effect of cross-linking.Suitable heat treatment of the fibre, which is treated by adding a comparatively small amount of T. M. D. and fully swollen, improves appreciablly their tensile strength and hot water resistance.
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