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Descripción
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| Depth-sensing indentation (DSI), or instrumented indentation, represents nowadays one of the leading techniques for mechanical testing. The reinforcing effect of inorganic fullerenelike tungsten disulphide (IF-WS2) nanoparticles in two different polymer matrices, isotactic polypropylene (iPP) and polyphenylene sulphide (PPS), has been investigated using dynamic DSI. Hardness and modulus are found to initially rise with filler content and level-off at loadings of ~ 0.5 wt%. The mechanical behaviour is explained in terms of two main contributions: i) changes in the polymer matrix nanostructure upon addition of the filler and ii) intrinsic properties of IF-WS2 including matrix-particle load transfer. It is found that the former produces no more than 10% of mechanical increment with respect to the neat matrix, while the latter can approach values of 50%. Remarkable enhancements are found for PPS upon addition of IF-WS2 while only moderate increments are observed for the PP counterparts. The nature of the polymer amorphous phase (whether in the glassy or rubbery state) is suggested to play here an important role. Finally, it is found that the modulus values obtained by means of DSI are higher than those determined from dynamic mechanical analysis. This result is discussed in terms of the different directionality of the applied forces. | |
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Internacional
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Si |
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Nombre congreso
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IUPAC World Polymer Congress 2014.The 45th International Symposium on Macromolecules (MACRO2014) |
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Tipo de participación
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960 |
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Lugar del congreso
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Chiang Mai (Thailand) |
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Revisores
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Si |
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ISBN o ISSN
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DOI
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Fecha inicio congreso
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06/07/2014 |
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Fecha fin congreso
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11/07/2014 |
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Título de las actas
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IUPAC World Polymer Congress 2014.The 45th International Symposium on Macromolecules (MACRO2014). Abstracts Book. |