| 초록 |
Polypropylene(PP)/layered silicate nanocomposites were prepared via simple melt mixing of three components, PP, layered silicates modified with octadecylamine(C18-MMT), and antioxidant, in order to investigate the role of antioxidant. By X-ray diffraction experiment, PP/C18-MMT composite without antioxidant showed immiscible state because PP and C18-MMT are quite incompatible each other. On the other hand, PP/C18-MMT nanocomposites with antioxidant showed the intercalated states with increased basal spacing of layered silicate. In rheological behavior, the nanocomposite with antioxidant showed higher storage modulus and complex viscosity than pure PP. However, PP/C18-MMT without antioxidant showed lower values owing to the bond breakage of PP molecules and the poor compatibility between PP and C18-MMT. The nanocomposite with antioxidant exhibited higher tensile modulus and higher dynamic storage modulus than those of PP. These enhanced mechanical properties demonstrate the reinforcing effect of nano-scale dispersed layered silicates in PP matrix. |
