Evaluating the Reinforcement of Inorganic Fullerene-like Nanoparticles in Thermoplastic Matrices by Depth-Sensing Indentation
Autor: | Araceli Flores, Marián A. Gómez-Fatou, Ana M. Díez-Pascual, Mohammed Naffakh, Fernando Ania |
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Rok vydání: | 2013 |
Předmět: |
Thermoplastic
Materials science Nanostructure Tungsten disulfide Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound Indentation Tacticity Physical and Theoretical Chemistry Composite material Elastic modulus chemistry.chemical_classification Nanocomposite Física Química Polymer 021001 nanoscience & nanotechnology 3. Good health 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy chemistry 0210 nano-technology |
Zdroj: | Journal of Physical Chemistry C, ISSN 1932-7447, 2013-10-10, Vol. 117, No. 40 Archivo Digital UPM Universidad Politécnica de Madrid Digital.CSIC. Repositorio Institucional del CSIC instname |
ISSN: | 1932-7455 1932-7447 |
Popis: | The reinforcing effect of inorganic fullerene-like tungsten disulfide (IF-WS2) nanoparticles in two different polymer matrices, isotactic polypropylene (iPP) and polyphenylene sulfide (PPS), has been investigated by means of dynamic depth-sensing indentation. The hardness and elastic modulus enhancement upon filler addition is analyzed in terms of two main contributions: changes in the polymer matrix nanostructure and intrinsic properties of the filler including matrix-particle load transfer. It is found that the latter mainly determines the overall mechanical improvement, whereas the nanostructural changes induced in the polymer matrix only contribute to a minor extent. Important differences are suggested between the mechanisms of deformation in the two nanocomposites, resulting in a moderate mechanical enhancement in case of iPP (20% for a filler loading of 1%), and a remarkable hardness increase in case of PPS (60% for the same filler content). The nature of the polymer amorphous phase, whether in the glassy or rubbery state, seems to play here an important role. Finally, nanoindentation and dynamic mechanical analysis measurements are compared and discussed in terms of the different directionality of the stresses applied. © 2013 American Chemical Society. The authors wish to thank the MICINN (Ministerio de Ciencia e Innovacion), Spain, for funding the research reported under ́ the grant FIS2010-18069 and MAT2010-21070-C02-01. M.N. would like to acknowledge the MINECO for a “Ramon y Cajal ́ ” Senior Research Fellowship, and A.D. wishes to acknowledge the CSIC for a JAE Postdoctoral Fellowship. |
Databáze: | OpenAIRE |
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