THE DYNAMIC VISCOELASTICITY OF POLYETHYLENE TEREPHTHALATE FILM DURING THE SORPTION PROCESS OF PHENOL

An apparatus for the dynamic viscoelastic measurement of polymer film in solution was devised. Using this apparatus the changes in dynamic viscoelastic properties for polyethylene terephthalate (PET) film during the sorption process of phenol were measured, and the results were analyzed according to the considerations of sorption process explained in the previous paper1). The results obtained were as follows: 1) The results of temperature dispersion measurements in this system were explained satisfactorily by the multi-phases parallel model. The fitness of this model for this system was confirmed by these results. 2) The relations between elastic modulus (EA) and concentration of small molecules absorbed (C) are linear in the low concentration of solution, and convex toward the both axes of EA and C in the high concentration of solution during the sorption process of this system. 3) Decrease velocity of elastic modulus for PET in sorption process of this system depends rather on the diffusion velocity of phenol than on the reaction velocity of phenol with PET.