Magnetic study of elongated polypropylene fibres

Study of stretched polypropylene fibres by pulsed and CW NMR spectroscopy

“…where r, r c and r a are the densities of the sample, of the completely crystalline region r c ¼ 936 kg m À3 , and of the completely amorphous region r a ¼ 850 kg m À3 , respectively [15].…”