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Structure parameters of various poly(p-phenylene terephthalamide fibers have been investigated using WAXD and correlated with mechanical properties. The mechanical properties examined were modulus E and strength σ; the pertinent structural parameters include orientation angle φ 200 , lattice constants a, b, c, paracrystalline parameter g II, apparent crystal sizes ACS 110 ,...
Cold drawing of aliphatic ketone terpolymers with CH 3 substituents is shown to promote production of the high density α crystal phase. The quantity of the minor α component decreases with increasing CH 3 content and the solid-solid α->β phase transition temperature is shown to be lower compared with the unsubstituted polymer. Draw rate affects the amount of α phase produced: low...
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