Abstract
AbstractThe melting and crystallization behaviour of undrawn poly(ethylene terephthalate)‐nylon 6 biconstituent fibers (BCF) have been investigated by DSC measurements. A decrease of the internal ΔT between the temperature of the glass transition and the temperature of the cold crystallization has been found. Changes of the temperature of the melt crystallization of the two components depending on the blend ratios (e.g. the phase morphology) have been also observed. These effects have been explained by an interface physical interaction which changes the degree of order of the molecules inside the phases. A relation between the decrease in ΔT of the PETP component and the maximum draw ratio λmax of the BCF has been established. It is supposed that the change in ΔT causes the occurrence of local tensions and the initial formation of microcracks in the PETP phase which lead to a decrease of λmax.
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