Citation: . OBSERVATIONS ON DEFORMATION BEHAVIOR OF HIGH PERFORMANCE FIBERS BY POLARIZING OPTICAL MICROSCOPY[J]. Chinese Journal of Polymer Science, ;2000, 18(1): 81-86. shu

OBSERVATIONS ON DEFORMATION BEHAVIOR OF HIGH PERFORMANCE FIBERS BY POLARIZING OPTICAL MICROSCOPY

Received Date: 14 February 1999
Revised Date: 4 July 1999

By means of polarizing optical microscopy (POM), deformation behavior of four kinds of fibers, i.e. ultra highmolecular weight polyethylene (UHMW-PE) fiber, polyvinyl alcohol (PVA) fiber, polyethylene terephthalate (PET) fiber,and wholly aromatic (p-hydroxybenzoic acid/2-hydroxy-6-naphthoic acid) copolyester [P(HBA/HNA)]/PET (ACPET blend)fiber, in axial compression, axial impacting, and bending was observed. In compression, kink bands formed at an angle of55～60° to the fiber axis in 10-times-drawn UHMW-PE fiber,75～80° in 40-times-drawn sample,80°in PVA fiber,and 90°in the ACPET blend fiber.In impacting and bending,band angles of UHMW-PE,PVA and PET fibers are nearly the same as those formed in compression,indicating that slip systems do not change.For any of the four kinds of fiber,band spacing exhibits great differences in compression,in impacting,and in bending,which may be attributed to the differences in the degrees of strain or stress concentration.
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