| 초록 |
Ethylene-vinyl alcohol copolymer(EVOH) has some drawbacks of high cost, low toughness, and difficult processing, although it exhibits excellent gas barrier property and transparency. Meanwhile, polyamide(PA) that is inexpensive relative to EVOH exhibits high resistance to the permeation of hydrocarbons as well as good toughness. Therefore, in this study, blending of PA and EVOH was attempted to produce new material systems with attractive characteristics. Ultimately, this blend system will be utilized in the future work by incorporating with polyolefin(PO) resin to produce ternary blend system of PO/(PA+EVOH) with high barrier property with respect to gas as well as organic compound. For this porpose, the relationships between composition and properties of PA/EVOH blends were analyzed using various techniques and the results were investigated in terms of level of compatibility. Rheological, morphological, thermal, and mechanical analysis and oxygen permeability measurement were carried out. It was confirmed from FT-IR analysis that there was hydrogen bonding interactions between hydroxyl group of EVOH and amide group of PA. Furthermore, rheological and mechanical properties and oxygen permeability of the blend exhibited positive deviation from simple additive rule, indicating that blends of PA and EVOH are fairly compatible and have a nearly single homogeneous phase at appropriate concentration due to specific interactions. |
