SOLVENT-INDUCED CRYSTALLIZATION OF AMORPHOUS POLY (ETHYLENE TEREPHTHALATE) FIBER IN CHLORINE SUBSTITUTED HYDROCARBONS

抄録

Some chlorine substituted aliphatic hydrocarbons exhibit strong interaction with amorphous undrawn poly (ethylene terephthalate) (PET) fiber. For example, solvent-induced crystallization in trichloroethylene develops within few seconds at 333-353K and even initiates at 256K. This fact suggests that the glass transition temperature of PET is depressed about 110K with the solvent. The spherulites develop from the surface to the center of fiber with the penetration of solvent and the transverse of fiber can be divided into two parts which are spherulite part and amorphous part. Apparent diffusion coefficient of trichloroethylene is estimated to be in the range from 3.35×10^-7 to 7.05×10^-5cm²/s and that of 1, 1, 1-trichloroethane to be in the range from 1.44×10^-8 to 1.52×10^-6cm²/s. Apparent activation energies are about 18 and 39kcal/mol, respectively. The stress-strain behavior is directly affected by the progress of solvent-induced crystallization.