Polymer mixtures, crystallization blends with different molecular

The presence of one phase In the xnelt for PB/EMA or PE/EMA-salt blends is not inconsistent with the thermal analysis results presented previously (17). It has been determined that there is separate crystallization of PE and EMA or EMA-salt in PE/EMA of PE/EMA-salt blends. In fact, even for two polymers which form one phase in the melt, co-crystallization is quite difficult to Induce. Kyu et al. (42) have shown that blends of linear and branched polyethylenes do not have the ability to cocrystallize and Prud homme (43) has shown that it suffices to have a small difference in molecular weight between two poly(ethylene oxides) to have separate crystallization. Therefore, homogeneity in the melt does not hinder the separate crystallization of the two conqponents of the mixture. 

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