| 초록 |
Poly (ethylene 2,6-naphthalate) (PEN) is a high-performance polyester that exhibits excellent physical, chemical properties and outstanding gas barrier characteristics. In spite of these advantages, application of PEN is limited because of its relatively high melt viscosity, which is not easy for fiber spinning and injection molding. Recently many researches have been carried out organic/ inorganic composite by applying nano-particles. These have been reported to exhibit greatly improved mechanical and chemical properties compared to the pure polymers or conventional particulate composites. Non-isothermal crystallization behavior of polymer is of great importance because most of the processing techniques occur under non-isothermal conditions. However, a few researches have been performed on the non-isothermal crystallization behavior of PEN/ Silica nanocomposite. In this research, PEN/ Silica nanocomposite were prepared by melt compounding method using HAAKE RHEOMIX 600 internal mixer with various silica contents (0, 0.3, 0.5, 0.7, 0.9 weight percent). Non-isothermal crystallization processes of the PEN/Silica composite were investigated on a differential scaning calorimeter (DSC). The crystallization kinetics was calculated by Ozawa equation for non-isothermal crystallization. The calculated Avrami exponent reveals three-dimensional growth of the crytallites and the rate of crystallization was increased with the silica contents increased. Therefore the crystallization of PEN was affected by the addition of fumed silica, which acts as a nucleating agent. |
