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The structures of the crystalline regions of cold-drawn fibres and highly oriented, stretched rubberlike specimens of polyethylene adipate (PEA) and polyethylene suberate (PES) have been determined. The unit cells are monoclinic with one chemical unit per fibre repeat and two chains per cell. The cell dimensions are: PEA, a=5.47, b=7-23, c (fibreaxis)=ll.72/~, fl=l13 30'; PES, a=5-51, b=7.25, c(fibreaxis)=14"28A, fl=l14 30'.
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Turner‐Jones et al. (1962) studied this question.
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