Abstract
The influence of supermolecular structures on the axial compressional behavior of PVA fibers was studied. Two kinds of PVA fibers with different supermolecular structures, HOMO-PVA fibers and BAND-PVA fibers, were used in this study. HOMO-PVA fibers with a long-period structure which is made up of stacked folded-chain crystals have a homogeneous appearance, while BAND-PVA fibers with extended-chain crystals have a characteristic banded structure. Axial deformation behavior of the BAND-PVA fibers was quite different from that of HOMO-PVA fibers. When the BAND-PVA fibers are axially compressed, PVA molecules in the banded structure are considerably kinked in zigzag fashion from band to band to form deep “creases”. On the other hand, when the HOMO-PVA fibers are axially compressed, kink bands are formed at angles of ∼45° to the fiber axis here and there along the fiber axis or a series of continuous bands with 1μm spacing are formed at angles of ∼75° over the whole fiber. It is suggested that (101) [010] slip plays an important role in the deformation of the BAND-PVA fibers.
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