AbstractThe physical properties of nylon 66 yarn treated with α,ω‐diisocyanates (tetramethylene, hexamethylene, decamethylene, and eicosane) and diacid chlorides (succinyl, adipyl, pimeloyl, sebacyl, dodecane, and docosane) were compared to the properties of a control exposed to the same reaction conditions but without the reagent being present. Two types of yarn were used: (1) a highly ordered yarn, as judged by density and x‐ray, from polymer of number‐average molecular weight 21,000; and (2) a less‐ordered yarn from polymer of molecular weight 14,800. Treatment was carried out with yarn in both constant‐length and relaxed conditions. The properties were changed most by constant‐length treatment and by the use of less‐ordered yarn. Treatment with diisocyanates resulted in an increase in the tenacity and modulus simultaneously. The strength properties often went through a maximum as a function of the degree of reaction. Treatment with diacid chlorides degraded the physical properties as a result of polymer chain scission and weakening of the interchain forces. Treatment with either type of reagent lowered the zero strength temperature, but had little effect on the moisture regain or ability of the yarn to dissipate sta
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