Influence of processing conditions on structure development and mechanical properties of poly(butylene terephthalate) filament

摘要

AbstractA study of the relationship between the drawing and annealing conditions of melt‐spun poly(butylene terephthalate) filaments and the resulting structure and mechanical properties is described. The relative amount of β‐form crystal content was found to increase with increase in draw ratio and to be directly proportional to the drawing stress for a given draw ratio. As drawing stress decreases with increase of draw temperature, the β content decreases rapidly with increased draw temperature. Annealing reduces the amount of β‐phase but increases the α‐phase content and crystallinity. The effect of these structural variations on the mechanical properties is examined. The mechanical properties are shown to be very sensitive to the structure of the filaments and, hence, to the processing