Nuclear Magnetic Resonance Investigation of the Influence of Drawing and Drawing Temperatureon Molecular Mobility in iPP Fibres

A set of stretched isotactic polypropylene fibres prepared with the draw ratio λ = 2.5 at different temperatures was investigated by $\text{}^1H$ pulsed relaxation NMR method and continuous wave spectroscopy. Both, drawing and temperature of drawing influence physical properties of isotactic polypropylene fibres. NMR technique is shown to be advantageous for the study of these changes on molecular level since the shape of broad-line NMR spectra and processes of the NMR relaxation depend on the spatial configuration and motions of the resonating nuclei.