Abstract
The degree of mixing between the undoped poly(3-alkyl thiophene), (P3AT), and a flexible matrix polymer, ethylene-co-vinylacetate, (EVA), has been investigated by using the solvent casting method for the preparation of the blend. Phase separation was observed by optical microscopy and thermal analysis in P3AT/EVA blends with high vinylacetate composition. Both poly(3-octyl thiophene) and poly(3-dodecyl thiophene) were found to form a homogeneous morphology at low P3AT composition when blended with EVA20 (vinylacetate composition 20 %). A LCST-type of a phase diagram has been constructed based on the cloud point measurements and the melting point depression of EVA20 crystals. A chromatic transition occurs in a “solvatochromatic” fashion in the miscible region of the blend, that is, as a function of concentration when diluting P3AT in the EVA20 matrix.
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