Abstract
Conventional wide angle X-ray diffraction and density techniques are used to measure the validity of a two phase model for the structure of polypropylene fibres. Percentage crystallinity studies showed that the crystallinity of polypropylene fibres when measured by the X-ray method as a function of increasing draw ratio remained constant, while the crystallinity of the same samples measured by the density method increased from 49 per cent (D.R.=3·0) to 77 per cent (D.R.=7·0). These data and a measured shift in the equatorial diffraction peaks strongly suggest the existence of intermediate states of order, and a paracrystalline model for the structure of polypropylene fibres is proposed.
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