Abstract
The changes in length of 6 nylon fibres* with known lateral-order distributions, are investigated at each stage of phenol-treatment (in air, in aqueous phenol solution, in water, in air) systematically. When, on return to original dry condition, no irreversible changes in length of 6 nylon fibres are caused, the fibre is defined to be set with respect to the aqueous phenol solution.
Total irreversible changes in length of various 6 nylon fibres with the concentration of the aqueous phenol solution are observed, and it is found that the total irreversible changes in length have a close connection with lateral-order distributions in the fibres. That is to say, on immersion of 6 nylon fibres in aqueous phenol solution of a certain concentration, irreversible change in length occurs, if regions of cohesive state of ∇Fui** value, which is smaller than ∇Fui** value correspond to the aqueous phenol solution, are found in the fibre, and it does not occur, when such regions are not found. And, it is elucidated that 6 nylon fibres with the same shapes of lateral-order distributions have the same dimensional stabilities.
