The morphology of woven polypropylene tapes compacted at temperatures above and below optimum

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The morphology of woven polypropylene cloth compactions, prepared at a series of temperatures, has been examined by electron microscopy following permanganic etching. With increasing temperature, the interior structure of the fibres is seen to undergo progressively greater melting and recrystallization in the form of shish-kebab structures while the volume of melt surrounding the fibres increases. The regions of recrystallized extra-fibrillar melt show effects of flow-induced orientation in the form of row structures. The presence of boundaries persisting where recrystallization fronts have met is interpreted as an effect of segregation of low molecular weight material.

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