Abstract
AbstractThe influence of composition on the primary nucleation process of poly(ethylene oxide) spherulites in the case of poly(ethylene oxide)/poly(methyl methacrylate) (PEO/PMMA) blends was investigated by optical microscopy and DSC. In the case of isothermally crystallized samples it was found that heterogeneous nucleation is depressed in the blends in comparison with plain PEO. This depression is caused by the dilution effect of PMMA. The self‐seeding nucleation mode is also disturbed by the presence of PMMA in the blends. This is due to both the diluent effect and to the decrease of the PEO melting temperature. In the case of non‐isothermally crystallized samples of PEO/PMMA blends an apparent increase of the nucleation density was observed. This observation is attributed to the fact that the growth rate is depressed in the blends: thus, at an earlier stage of crystallization, the volume in which the nuclei are free to develop (for a given crystallization condition) is larger.
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