| 초록 |
Interfacial polymeric system shows distinct phenomenon from bulk polymeric system. Using NEMD simulation, structural and rheological properties of linear polymer in confined system are analyzed and compared to those in bulk system. Molecular dynamic mechanisms are classified into 3 regimes according to the applied flow strength. In 1st regime, both systems show chain alignment and extension to flow direction. In addition, wall-polymer interactions brings rotation and alignment of interfacial chains. In 2nd regime, S shape tumbling and disentanglements are initiated. And, competition of external flow field and wall interaction induces interfacial wagging and hairpin-like tumbling. In 3rd regime, interfacial polymers go through a hairpin-like tumbling in commonly with bulk polymers and strong flow field causes interfacial chains to collide with wall and to escape from the wall. These microscopic molecular behaviors are also demonstrated with macroscopic and mesoscopic properties. |
