| 초록 |
Transparent, soft, light and non-ionic polyvinyl chloride (PVC) gel films were prepared by a cyclic freeze-thaw method. The PVC gels resulted in a three-dimensional network held together by crystallites acting as physical crosslink. The freeze-thaw cycles caused a high degree of physical crosslinking density in the PVC gels and thus exhibited excellent mechanical properties of high tensile strength, elongation and good shape recovery by elasticity. In particular, a variation in the transparency, degree of crystallinity, and mechanical properties of the PVC gels was schematically evaluated as a function of the cyclic number of freeze-thaw by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), universal testing machine (UTM), and ultraviolet-visible spectroscopy (UV-vis). |
