Abstract: | The mechanical and viscoelastic behaviors of polymeric fibers varying in molecular weight have been determined at the nanometer scale with a surface force apparatus. The existence of a skin–core structure resulting from the elaboration process is pointed out. The role of fiber anisotropy is also discussed. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 264–275, 2005 |