Abstract
Molecular orientation in the surface layer of extruded nylon 6 film was examined by polymer epitaxy technique. It was confirmed that most of the nylon 6 molecules in the surface layer orient parallel to the machine direction of extruded nylon 6 film. Extruded nylon 6 film was annealed in contact with drawn polytetrafluoroethylene (PTFE), holding their molecular axes at right angle to each other. Polycaprolactone (PCL) was crystallized on the surface of nylon 6, which was removed from the PTFE surface. Molecular axis of overgrown PCL lay perpendicular to the machine direction of nylon 6. This result indicates that molecular axis of nylon 6 rotate 90° from the machine direction to the drawing direction of PTFE.
Cold-drawn polyethylene (PE) was annealed in contact with drawn polyoxymethylene and hot-drawn PE, holding their drawing directions at right angle. It was found that PE molecules in the surface layer also change their molecular axes to the direction of molecular axes of another polymers.
These results can be explained on the basis of meltin-recrystallization mechanism. Oriented nucleus of nylon 6 or PE may be formed at the interface during the annealing process.
