AbstractWater adsorption of nylon 6 fibers subjected to various heat‐setting treatments was measured over the range of 0–80 R.H. with a quartz balance, and the water adsorbed on the first layer (vm) was calculated. The value ofvmwas largest for unset fiber, intermediate for steam‐set fiber, and the smallest for dry‐heat‐set fiber. The inner surface areas in nylon calculated fromvmare 4–5 × 105cm.2/g. The value obtained by dividingvmby the amorphous fraction (1 − α) of heat‐set fibers appears to be related to the number of intermolecular bonds per unit volume of the amorphous region. The smaller values ofvmthus obtained for the dry‐heat‐set fibers indicate that polymer molecules in the amorphous region form many intermolecular bonds and are more closely packed than those in the unset
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