Polyesters high speed spun

Characterization of the microstructure of high speed spun polyester fibers has been demonstrated using combined SEM of bulk peeled fibers and fiber surfaces, OM of thin sections and TEM of sections both stained and unstained. 

In structural studies, fibres are generally considered to be transversely isotropic. However, it is sometimes found that commercial fibres have a distinct radial differentiation of structure. This is most pronounced in fibres spun from solutions, which show a distinct skin-core effect. A radial nonuniformity has been also found in some melt-spun fibres, e.g. in polyester fibres produced at very high spinning speeds.It should also be noted that in some fibres e.g. aramids" ) there is a preferential radial orientation of certain crystal planes, in contrast to a random radial orientation normally exhibited by conventional commercial fibres. 

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