Fibres & textiles in eastern europe vol:11 issue:5 pages:28-31
DSC & simultaneous real-time SAXS and WAXS studies of the isothermal crystallisation, melting and morphology of homogeneous polyethylene-1-octene copolymers are presented. The multiple melting behaviour of the copolymers observed after isothermal crystallisation indicates that two kinds of crystals of different stability are formed. Two melting endotherms appear after different periods of isothermal crystallisation, testifying that the melting-recrystallisation-remelting process is not responsible for the effects observed. The crystals which melt at higher temperatures are probably formed from the longest ethylene sequences and are of the lamellar type, while the crystals which melt at lower temperatures are formed from the shorter extended sequences and are of a fringed micelle type.