Changes in the mechanical and thermal properties of high impact polystyrene (HIPS) in the presence of low polypropylene (PP) contents
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The final properties of recycled polymers greatly depend on the presence of impurities, which can be detected by differential scanning calorimetry. For the purpose of the present study a total of five high impact polystyrene (HIPS)/polypropylene (PP) blends (100/0; 97.5/2.5; 95/5; 92.5/7.5; 90/10) were prepared and injected at a temperature in the 220–250 °C range. The subsequent mechanical characterization indicates a reduction of tensile strength, elongation at break and impact strength. Scanning Electron Microscopy (SEM) was used in the morphological analysis of the different blends. Finally the variations in the flow measurements and glass transition temperature were analysed using melt flow index (MFI) and differential scanning calorimetry (DSC), respectively. The presence of impurities may have a negative effect on the mechanical properties of the material, but may improve material performance during processing.
KeywordsDifferential Scanning Calorimetry Impact Strength Butadiene Moulding Temperature Melting Enthalpy
The authors thank “Ministerio de Ciencia y Tecnología”, Ref: MAT 2003–05511 for their financial support. We would like to thank the R + D + I Linguistic Assistance Office of the Polytechnic University of Valencia for their help in translating this paper. Also, Microscopy Services at UPV are gratefully acknowledged for their assistance in using SEM techniques. Finally, the authors thank ACTECO, productos y servicios, S.L for their materials.
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