Abstract
Sixteen samples of commercial, high tensile strength, PAN-base carbon fibres were studied by TEM. These fibres are made of aromatic basic structural units less than 10 Å in size associated edge to edge in parall el to from larger wrinkled aromatic layer sheets. The sheets are crumpled parallel to the fibre axis and then the folds are entangled. This results in a porous texture with pores elongated parallel to the fibre axis. The lateral cohesion is made by bonding between two sheets in contact by their faulty areas. The fibres differ from one another by the degree of crumpling. A transverse close packing index Δ t is defined thus increasing from 0 to 1 as crumpling increases. Mechanical properties ( σ c , ϵ f , E f , E i , E s ) were determined on single filaments in the vicinity of the areas studied by TEM. The value of the tensile strength to failure σ c increases as Δ t increases. However, the values of Young's modulus vary little.
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