The relaxation processes (α, β, and γ) in UHMW PE fibres drawn to different draw ratios λ have been studied by dynamic-mechanical and nuclear magnetic resonance methods. The temperature dependences of tensile loss moduli E and spin-lattice relaxation times T1 have been analyzed assuming distribution of correlation times τ according to the Davidson-Cole function. The activation energies Ea and parameters ε characterizing widths of distribution, and asymptotic value τ0 for correlation times have been determined from experimental data for low-temperature γ-process and for high-temperature α-process. A weak β-process has been found by dynamic-mechanical method and quantitative analysis was made only for fibres with λ = 9. The temperature dependences of second moment M2 of the broad-line NMR spectra have been analyzed according to the Gutowsky-Pake formula, which includes only a single correlation time τc without distribution. In this case the activation energies Ea and values of τ0 have been determined.

Three types of drawn PP fibres have been investigated by nuclear magnetic relaxation methods. The two minima observed in both the temperature dependence of T, and Tzeff are related to the well known pand a-processes, respectively.The results of the experiments show that in particular the crystalline regions are influenced by drawing. Kernmagmtische Relaxation in PolypropylenfasernMit Hilfe der kernmagnetischen Relaxation wurden drei Typen gereckter PP-Fasern untersucht. Die beiden Minima in den Temperaturabhangigkeiten von T, und Tzeff sind dem 8bzw. dem a-ProzeD zuzuordnen. Die Ergebnisse der Experimente zeigen, da5 durch die Reckung insbesondere die kristallinen Bereiche beeinfluJ3t werden. H3epnoaaztmmnaa penaxcay us e nonunponunenoebzx eonomax MeTOAOM RMP H3YYeHbI TPH THna RbITJTHYThIX ~OJIHnPOIlHJIeHOBbIX ROJIOKOH. ABa MHHHMYMa H a KpMBOfi 3aBHCA-MOCTII T I II Ea,#,@ OT TeMnepaTypM npnnncbmamcn npoqeccaM 8-H a-penaxcaqnu. IIonyseHHbIe p e~y n b~a~b~ no-Ka3bIBaH)T, YTO IIpOqeCC BbITIImKH OKa3bIBaeT BJIIIJTHUe o c o 6 e~~o H a KpHCTaJIJIH9eCKMe o 6 n a c~u .The influence of different preparation conditions upon formation of the morphological structure of polypropylene fibres was studied by X-ray method, scanning electron microscopy, and small-angle light scattering technique. It was found that the formation process and the deformation of the morphologic structure in polypropylene fibres changed when using the traditional and the high velocity technologies, respectively. Die morphologische Struktur von PolyprvpylenfasernDer EinfluS verschiedener Herstellungshedingungen auf die Bildung der morphologischen Struktur in Polypropylenfasern wurde mittels Rontgenbeugung, Scanning-Elektronenmikroskopie und Kleinwinkel-Lichtstreuung untersucht. Es wurde festgestellt, da8 der BildungsprozeB und die Deformation der morphologischen Struktur in den Polypropylenfasern sich beim Ubergang von der traditionellen zur Hochgeschwindigkeitstechnologie andern.

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