Influence of chemical structure on the rheological properties of polyurethane fibres with varying hard segment concentrations
Polyurethanes containing alternating soft and hard segments along their chain length can be regarded as one type of molecular species that form polymers containing multiphase systems. Others include the styrene-butadiene block co-polymers and segmented polycarbonates. The examination of such polymers offer unique opportunities for studying the interactions between chemical and physical structures and their influence on the rheological properties of the polymer. For example a considerable amount of research has been carried out to find the influence of segment concentration on such properties as tensile strength elongation modulus and melting point (1–7). For commercial reasons most of the work in this field has been carried out on elastomeric systems in an attempt to obtain polymers with high strength, elongation and elastic recovery, and low stress relaxation. Little work has been carried out on those multiphase systems which contain high hard segment concentrations and show low elastic recovery.
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