Abstract
The compatibility behaviour of melt-mixed blends of a polyester-type polyurethane (PU) with the Zn 2+ ionomer of poly(ethylene- co-methacrylic acid- co-isobutylacrylate) terpolymer (Ion., Zn 2+) was investigated in the complete composition range. The techniques applied were tensile testing, dynamic mechanical analysis (d.m.a.), differential scanning calorimetry (d.s.c.), Fourier transform infrared ( FTi.r.) spectroscopy and optical microscopy. Tensile properties were typical of a compatible system and d.m.a. results indicated a miscible blend. FTi.r. results failed to reveal the nature of the specific forces involved in bringing about compatibilization. Analysis of the thermal data obtained allowed the determination of a polymer–polymer interaction parameter which had a near zero value at the elevated temperatures where it was determined.
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