Naslov
Thermal and mechanical properties of thermoplastic polyurethane / ipolypropylene blends modified with micro- and nano- mineral fillers

Autori
Govorčin Bajsić, Emi ; Ocelić Bulatović, Vesna ; Ormuž Pavić, Bojana

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
4thInternational Symposium of Environmental Management – Towards Circular Economy, (SEM 2016) : Book of proceedings / Zvonimir Katančić, Zvonimir ; Koprivanac, Natalija ; Lončarić Božić, Ana ; Kušić, Hrvoje ; Hrnjak-Murgić, Zlata - Zagreb : Fakultet kemijskog inženjerstva i tehnologije Sveučilišta u Zagrebu, 2016, 127-134

ISBN
978-953-6470-77-8

Skup
4thInternational Symposium of Environmental Management – Towards Circular Economy (4 ; 2016)

Mjesto i datum
Zagreb, Hrvatska, 07.12.2016. - 09.12.2016

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
TPU ; iPP ; microfiller ; nanofiller ; thermal propreties ; mechanical propreties

Sažetak
In this work the effect of micro and nanofillers (F) (kaolin and nanosilica) on the thermal and mechanical properties of thermoplastic polyurethane (TPU) and isotactic polypropylene (iPP) will be investigated. The polymer blends of TPU and iPP are incompatible because of large differences in polarities between the nonpolar crystalline iPP and polar TPU as well as high interfacial tension between them. The incorporation of proper filler reduces interfacial tension, refines blends morphology and therefore leads to an improvement of processing and application properties of the final material. For industrial application of blends it is important to consider the relationship of miscibility- structure-properties that can be achieved by varying the ratio of iPP in the TPU and vice versa. Polymer composites (TPU/F and iPP/F) and polymer blends (TPU/iPP/F) were prepared by melt mixing of TPU and iPP with 5 wt. % of kaolin and nanosilica in a twin-screw extruder. The results obtained from dynamic mechanical analysis indicated partial miscibility between the TPU and iPP. The addition of kaolin and nanosilica decreased the molecular mobility of the soft segments and improved miscibility in all investigated TPU/iPP/F blends. The DSC results showed that the kaolin layers could act as nucleation agents for the crystallization of TPU/iPP blends. Tensile results revealed that introducing kaolin in the TPU/iPP blends resulted in an increase in the tensile strength. On the other hand, the addition of the nanosilica improved the tensile strength and decreases elongation at break. This improvement can be explained with the formation of hydrogen bonds between the silanol groups on the nanosilica surface and the soft segments in the polyurethane. These interactions decreased the distance between the polyurethane chains, leading to increase the crystallinity of the soft segments.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Interdisciplinarne tehničke znanosti

POVEZANOST RADA