Naslov
Modification of PP+PS-HI Blends with SEBS Block Copolymer

Autori
Holjevac, Grgurić, Tamara ; Rek, Vesna ; Brostow, Witold ; Jelčić, Želimir

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

Skup
POLYCHAR-15 World Forum on Advanced Materials

Mjesto i datum
Rio de Janeiro, Brazil; Armação de Búzios, Brazil, 16.04.2007. - 20.04.2007

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
polymer blends; compatibilization; DMA; morphology; scratch; fractal analysis

Sažetak
The effect of different concentrations of compatibilizer styrene-ethylene/butylene-styrene block copolymer, SEBS, on properties of polypropylene+high-impact polystyrene blends, PP+PS-HI, was investigated. Uncompatibilized and compatibilized blends were prepared in the twin-screw extruder, in the whole range of compositions, and processing behaviour was followed through torgue, output and melt pressures. Relaxation processes of the investigated blends were obtained by dynamic-mechanical analyzer, DMA. The interactions between phases and compatibility of polymer blends were followed through glass transition temperatures, intesities of relaxation maxima and storage modulus.1 The effect of compatibilizer on supramolecular structure and the degree of cristallinity was obtained by differential scanning calorimeter, DSC. Scanning electron microscope, SEM, was performed to obtain changes in morphological structure and the effect of SEBS block copolymer on reduction of domain size and particle dispersion in polymer blends. Scratch resistance was measured in a Micro-Scratch Tester, MST, with diamond tipped indenter, for several loads from 5 to 20 N, and SEM was used to characterize the deformation and wear mechanisms of the investigated blends2, 3. The fractal analysis of topography images of polymer blend fracture surface, as well as SEM microphotographs of scratches, were processed using the “ box-counting” method, and fractal dimensions DBBW, DWBW and DBW were obtained.4 The results show that SEBS block copolymer acts as compatibilizer in PP+PS-HI blends, especially in PP matrix blends. It was found the reduction of domain size, better particle dispersion and more uniform morphology in compatibilized blends. The correlation between results of processing parameters and morphological structure as well as microphotographs of scratches, was obtained by fractal analysis. 1. V. Rek, T. Holjevac Grgurić, Ž. Jelčić and D. Hace, e-polymers, 2004, no. 034. 2. W. Brostow, Performance of Plastics, Hanser, Munich-Cincinnati, 2000. 3. M.D. Bermudez, W., Brostow, F.J. Carrion-Vilches, J.J. Cervantes, G. Damarla and J.M. Perez, e-polymers, 2005, no. 003. 4. Ž. Jelčić, T., Holjevac Grgurić and V. Rek, Polym. Deg. Stab., 2005, 90, 295.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA