engleski

Dynamic mechanical study of thermoplastic polyurethane/polypropylene blends

Thermoplastic polyurethane (TPU) is an important class of elastomers that has found many novel and specialized applications where high mechanical and chemical performances are prerequisites. They are known for their good mechanical strengths, wear and tear resistance, and low-temperature elasticity. The aim of this work is the study of the viscoelastic behavior of thermoplastic polyurethane (TPU), polypropylene (PP) and their blends using a dynamic mechanical analysis (DMA). Dynamic mechanical analysis is sensitive technique for characterization the structure and viscoelastic behavior of polymeric materials. Blends of TPU+PP, TPU and PP in their pure form were prepared using a laboratory twin-screw extruder (Haake Record 90). The primary and secondary viscoelastic functions were determined. Primary viscoelastic functions, storage modulus (E’ ), loss modulus (E’ ’ ) and loss tangent (tand) were evaluated in the temperature range – 100oC to 250oC. The secondary viscoelastic functions creep, recovery and creep modulus were investigated in creep-fatigue regime at temperatures 25, 35, 45, 55 and 65oC. A master curve for the reference temperature 25oC for the creep modulus of TPU, PP and TPU+PP blends are created by applying the time-temperature correspondence principle. In the literature, there are no creep data of TPU/PP blends. However, because from both a scientific and a commercial point of view is desirable to investigate the stability of the blends on the creep influence. On the base of the results obtained the correlation, continuous phase and phase morphology of investigated systems was discussed

thermoplastic polyurethane; polypropylene; dynamic mechanical analysis

Rad je kao poster prezentiran na skupu 12th Annual Polychar World Forum on Advanced Materials (POLYCHAR-12), održanom od 06.-09.01.2004., Guimaraes, Portugal ; uz međunarodnu recenziju objavljen u Knjizi sazetaka ; Witold Brostow (ur.) ; str. 113-113.