| 초록 |
In this work, the effect of addition of biodegradable poly(butylene succinate) (PBS) in difunctional epoxy (2EP) resin was investigated in terms of rheological properties, cure kinetics, thermal stabilities, and mechanical interfacial properties. Rheological properties of the blend system were measured under isothermal condition using a rheometer. Cross-linking activation energies (Ec) were determined from the Arrhenius equation based on gel time and curing temperature. As a result, the Ec was increased in the presence of 10 wt.% PBS as compared with neat 2EP. From the DSC results of the blends, the cure activation energies (Ea) showed a similar behavior with Ec due to the increased intermolecular interaction between 2EP and PBS. The decomposed activation energies (Et) for the thermal stability derived from the integral method of Horowitz-Metzger equation, were also increased in 10 wt.% PBS. In addition, 20 wt.% PBS showed the highest critical stress intensity factor (KIC), which was explained by increasing the fracture toughness of the 2EP/PBS blend systems. |
