ISSN:
1013-9826
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:
The influences of the polyhedral oligomeric silsesquioxane (POSS) on the mechanicalproperties of the polystyrene (PS) under tensile strain loading were studied using the atomistic finiteelement simulations. Firstly, the nano scale pole-like atomistic models and the micro scale pole-likefinite element models of two kinds of homopolymers, the pure PS and the polystyrene attached with 5mol% propyl-POSS (P-POSS-PS), were built, after which the atomistic finite element models werebuilt by connecting the carbon and silicon atoms on the boundaries of the atomistic models to thecorresponding nodes in the finite element ones. Then the mechanical behaviors of the two kinds ofhomopolymers under different tensile strains were investigated. The results show that, when thetensile strain of PS reaches 0.05 the micro voids appear. The tensile stresses of PS approximativelykeep increasing with the increasing strain before the tensile strain of 0.07, after which the stressesdeclines. And the corresponding tensile modulus of PS is 4.52GPa. By contrast with PS, when thetensile strain of P-POSS-PS reaches 0.06 the micro voids appear. The tensile stresses of P-POSS-PSare almost keeping increasing before the tensile strain of 0.08, and the corresponding tensile modulusis 5.32GPa. Conclusions can be made from this work that the tensile strength of homopolymers can beobservably improved by POSS. A small quantity of POSS can even improve the toughness ofhomopolymers slightly. This work has realistic theoretical significance to understand thereinforcement mechanism of POSS and provides important referential message to the applications ofPOSS
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.965.pdf
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