Abstract
High-density polyethylene (PE)-isotactic polypropylene (PP) blends have been characterized by a number of techniques such as wide-angle X-ray scattering, differential scanning calorimetry, picnometry, swelling in n-hexane and finally stress-strain tensile elongation. All the measurements have been performed on cilindrical shaped specimens, obtained directly by extrusion. The specimens show a complete random orientation of the crystallites of both the components. No co-crystallization phenomenon are observed. The melting point of both PE and PP decreases slightly with increasing concentration of the second component. The fractional crystallinity of PE decreases and that of PP increases with respect to the corresponding homopolymer values with increase in the concentration of the companion polyolefin. Such an effect is related to morphological kinetic effects and to different rates of crystallization of the two components, during the non-isothermal crystallization process following extrusion. Young's modulus, E is proportional to the overall fractional crystallinity. The ultimate properties show a synergistic effect due to the strong interactions between the crystallites and their tie molecules of the two PE and PP distinct phases. Finally, it is to be remarked that the results obtained in this paper, especially with respect to the ultimate properties, are quite different from those reported by other authors. This can be attributed to the different processing conditions used for obtaining the present blend specimens. Such conditions are certainly very important in determining particular blend morphologies which will determine in turn the properties of the analysed samples.
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Greco, R., Mucciariello, G., Ragosta, G. et al. Properties of polyethylene-polypropylene blends. J Mater Sci 15, 845–853 (1980). https://doi.org/10.1007/BF00552093
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DOI: https://doi.org/10.1007/BF00552093