Naslov
Dynamic mechanical study of thermoplastic polyurethane/ polypropylene blends

Autori
Govorčin Bajsić, Emi ; Rek, Vesna

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Program and book of abstracts, POLYCHAR-12, 12th Annual Polychar World Forum on Advanced Materials / - , 2004

Skup
12th Annual Polychar World Forum on Advanced Materials

Mjesto i datum
Guimarães, Portugal, 06.01.2004. - 09.01.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
thermoplastic polyurethane; polypropylene; dynamic mechanical analysis

Sažetak
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. On the base of the results obtained the correlation continous phase and phase morphology of the investidgated systema was discussed.The experimental data showed better agreement with WLF model than the Arrhenius model for all investigated samples.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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