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Abstract  

The example of polyethylene of low density (PELD) crystallization in ethylbenzene and some other alkylbenzenes presence demonstrates the unsufficiency of formal liquidus curve knowledge for the description of phase equilibrium in amorphous-crystalline polymer-liquid system. Experimental data affirming polymorphous structure of PELD crystalline phase and influence of the solvent on the order of various regular structures formation in it are being reported.

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Abstract  

Investigated materials were produced from polyethylene of low density (PE-LD) and a filler: carbon black or chalk. A part of the samples was kept in ambient temperature over several months in order to study the effect of material ageing. The qualitative conclusions were drawn based on a precise analysis of shape of DSC curves and the basic investigations of PE morphologies known from literature. The influence of the thermal history and the filler contents on the amount and kind of crystal phase was established. Additionally, the effect of the measurement technique, in our case it was positron annihilation lifetime spectroscopy (PALS), on the morphological feature changes was found. The paper serves selected examples of problems solved by DSC. However, from the other hand, the authors discuss critically the opportunity given by this method.

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