PETフィルム耐熱性向上のための溶媒浸透法の応用研究

概要

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Solvent-induced crystallization effect has been found to be quite useful for the reduction of the thermal shrinkage of oriented poly(ethylene terephthalate) (PET) film. This method involves dipping of amorphous PET film into acetaldehyde for only a short time, which causes a drastic increase in the film crystallinity. The thus-dipped and dried-up film was stretched at near the glass transition temperature (Tg) to obtain the sample with relatively high degree of chain orientation. This oriented sample has been found to show negligibly small thermal shrinkage even when the sample was heated up to 95°C, much higher than Tg. This new method has a potential to open a new and simple technology for the mass production of PET bottles without any thermal shrinkage even for the supply of boiling water into them. The origin of thus-obtained high thermal resistivity of acetaldehyde-immersed and oriented PET film has been clarified on the basis of infrared ATR (attenuated total reflection) spectral measurement.