The relationships between the changes of stretching work or mechanical properties and the behavior of molecular orientation for uniaxially stretched Nylon-6 films prepared by wet process in water were discussed. Following results were obtained. (1) The degree of total molecular orientation can be simply expressed as a function of the logarithmic stretching work. (2) The crystal orientation is oriented higher than that of the amorphous chain with increasing stretch ratio. And, the degree of

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... tation for amorphous chain is unchanged during higher stretch ratio. (3) The linear relationship between the logarithmic stretching work versus Young's modulus of the stretched films is recognized.