| Popis: |
Reversed gas-chromatography has been used to establish the Flory-Huggins parameter ξ23 for the thermodynamic interaction between the melted components of polyethylene glycol (PEG-15,000) and oligoethylene glycol adipate (OEGA-2000), oligopropylene glycol (OPG-1055) and oligostyrene (PS-3040), and of paraffin with M-270; the same was also established for OEGA-OPG, PEG-2000-PEG-40,000 blends and those of low density PE with polyoxymethylene. The concentration dependence of the crystallinity of all the above systems has been found to be identical with that of their ξ23. The conclusion drawn is a larger crystallinity for the dynamically less stable melt blends in the solid state, while those more stable have a lower crystallinity after cooling. |
