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Preparation and characterization of nanoclay-filled polymer blends

from SPE Plastics Research Online

Thermoplastic polyurethane (TPU) is attractive because of its high abrasion resistance, tensile and tear strength, flexibility, and shock-absorbing capabilities. However, it has certain disadvantages, including high cost, moderate thermal stability and mechanical strength, and limitations as regards to chemical resistance and processability. On the one hand, polypropylene (PP) is usually added to TPU to improve the thermal stability of the latter, as well as its chemical and mechanical properties (modulus, strength, hardness), processing performance and to reduce cost. On the other hand, TPU is blended with PP to improve the properties of PP (e.g., impact strength, adhesion and paintability/printability). Blends of TPU and PP are highly incompatible because of the compounds' large differences in polarity and the resulting high interfacial tensions. more

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