Abstract
Polystyrene (OPS) having oxazoline groups and polyethylene (CPE) having carboxyl groups were melt blended in a Rheomix mixer. The effects of composition on the torque, thermal transitions, solubility and phase structure of these resulting polymer alloys were investigated. Differential scanning calorimetry (d.s.c.) and scanning electron microscopy (SEM) data on these alloys is compared with the corresponding melt blends of the non-reactive polymers. The torque-time relationships, phase structure and thermal properties of these polymer alloys were found to be very different from the non-reactive blends, and this was more so in an alloy with 40% CPE. This is attributed to the coupling reaction between the OPS and CPE. Studies on extraction of this alloy in xylene support the presence of a crosslinked polymer. The Fourier transform infra-red ( FTi.r.) spectra of alloys and their low molecular weight analogues show that amido-ester linkages similar to the model compounds are formed between OPS and CPE.
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