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Superdrawn crystalline polymers: A new class of high‐strength fiber
Author(s) -
Clark E. S.,
Scott L. S.
Publication year - 1974
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760141004
Subject(s) - materials science , fiber , composite material , ultimate tensile strength , deformation (meteorology) , polymer , modulus , lamella (surface anatomy) , matrix (chemical analysis) , limiting , mechanical engineering , engineering
A new kind of acetal fiber has been discovered which has a tensile strength of 1.7 GPa (250,000 psi) and an elastic modulus of 35 GPa (5 × 10 6 psi). This fiber is produced by a special two‐stage drawing process in the solid state which requires careful control of deformation rate and temperature. Previously known drawn fibers are reported to consist of folded‐chain blocks joined by a limited number of tie‐molecules. It is hypothesized that the second stage of the novel drawing process eliminates the lamella (block) surfaces which act as strength‐limiting stress concentrators. A new type of fiber is created in which any remaining chain‐folds are distributed as defects in a continuous crystal matrix. It is the continuity of the crystal matrix which is believed responsible for the remarkable properties of the fiber.