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The stretching of thermally stable polymers by hot dry process is very difficult, because these polymers have high glass transition temperatures. We developed a swell-wet stretching process; the polymers are stretched in a swelling agent at lower temperature. The purpose of this series of study is to make clear how the stretching media and temperatures affect the mechanical properties of resulting polymer materials, e.g. fibers or films.In this report, Nylon-6 films were uniaxially stretched with free width at 10-90°C by 100%/min in water. The stretchability was estimated by stretching work. The work is concerned with stretching stress and strain, and initial modulus. We found that it is a good measure for the estimation of stretchability of the film.

ON THE STRETCHING WORK DURING UNIAXIAL STRETCHING IN WATER BY WET PROCESS FOR NYLON-6 FILMS