染料拡散挙動に基づくナイロン6フィルムの一軸および二軸延伸に伴う非晶領域の変化について

抄録

The change of amorphous region of the film caused by the uniaxial or biaxial stretching was studied by measurements of thermal shrinkage and dye-diffusion as a function of stretch ratio. The specimens, stretching devices and stretching conditions are the same as described in the previous report (part 15). The thermal shrinkage was measured for samples having the following history. After being treated at 160°C for various time duration under fixed condition, the samples were immersed in hot water at 90°C for 2hrs. The measurement of diffusivity of acid dye, Orange II, was carried out at 70-90°C. Data of the crystallinity and molecular orientation are those reported in the previous paper (part 15).
The following results were obtained:
(1) For the stretched films with different molecular orientation, it is suggested that certain relation exists between the properties of thermal shrinkage of the films and the morphology of amorphous region or the tautness of chain.
(2) The morphology of amorphous region of the film as inferred from the diffusivity of dye, are influenced by the variation of stretching method, i.e. orientation mode, of the films.
(3) The effect of the crystallization with stretching of the films on the dye-diffusion indicates that the mobility and flexibility of chain segment are greatly influenced.
(4) The amorphous region of the film uniaxially stretched with free width has a denser network and larger flexibility of the chain segment. The structures of simultaneous-biaxially stretched films, however, has an expanded network and smaller flexibility. Further, those of the films uniaxially stretched under constant width contains intermediate state between the above two films.