| 초록 |
The thermal and mechanical properties of the zone-drawn Nylon6/Clay nanocomposite film were studied using differential scanning calorimetry (DSC), wide- and small-angle X-ray scattering (WAXS and SAXS), scanning electron microscoph (SEM) and dynamic mechanical analysis. In the DSC thermogram as shown in Figure 1, the pressed film shows double melting endotherm from ~200℃ to ~225℃ as well as the other melting behavior at ~245℃ while the drawn film had one main endotherm at ~220℃ Melting of α-form in nylon6/clay nanocomposite occurred the wide and broad endotherm prior to the main melting peak. Also the melting peak at ~245℃ was the melting behavior of the recrystallized α-form. The origin of these thermal properties was studied using synchrotron radiation source at PAL. From those studies, the recrystallized α-form was observed after melting the γ-form in the nylon 6/clay nanocomposite. These results showed the dynamic and serial melting behavior of each crystalline phase and could be compared with the DSC data. We also studied the structural change during heating using dynamic mechanical analysis. The result of SEM indicated the interface between nylon 6 and the clay agglomerates and dispersion of the clay agglomerates on nylon 6 matrix. To explain the mechanical properties of this nanocomposite, the storage and loss modulus was estimated with Rheometric Solid Analyzer(RSA). The addition of clay increased the storage modulus. And the film that was drawn much more ratio had higher tan d and glass temperature of that came into view to more high temperature than that processed with lower draw ratio. From two temperature, -50℃, which was a typocal temperature at which nylon6 is in the vitreous state, and +150℃, which was characteristic of the rubbery plateau. Moreover, it seems that the storage modulus (E') was retained at a high level over a wide temperature range by the drawn ratio. This can be due to the more oriented lamellar by the zone-drawing. |
