ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Polypropylene/polyamide-6 and polypropylene/metallocene polyethylene blends containing 2.5 phrof organophilic modified montmorillonite were prepared in a twin-screw extruder followed byinjection molding. In order to compare, blends without layered clay were also made. Styreneethylene-butylene-styrene copolymer and polypropylene grafted with anhydride maleic were usedas compatibilizers in the ternary blends and in the PP nanocomposite preparation, respectively. Thepresence of tactoids, intercalated and exfoliated structures was observed by TEM in some of thesamples containing layered clay and modified PP materials. Results showed that the compatibilizedblends prepared without clay are tougher than those prepared with the nanocomposite of PP as thematrix phase and no significant changes in tensile moduli were observed between them. However,the binary blend with a nanocomposite of PP as matrix and metallocene polyethylene exhibitedbetter tensile toughness and lower tensile modulus, than those prepared with a nanocomposite of PPand polyamide-6 as dispersed phase. These results are related to the degree of clay dispersion in thePP and to the type of morphology developed in the different blends. Differential scanningcalorimetry (DSC) showed that blends with a finer and homogeneously dispersed morphologydetermined by SEM, the PA component exhibited fractionated crystallization exotherms in thetemperature range of 159-185°C. Also, nucleation of the PP component by PA phase and/or thelayered clay was observed in the blends with PA as dispersed phase
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.21.pdf
