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Materials 2014, 7(10), 7073-7092; doi:10.3390/ma7107073

Property Relationship in Organosilanes and Nanotubes Filled Polypropylene Hybrid Composites

Tecnológico de Monterrey Av. Eugenio Garza Sada Sur 2501, Tecnológico, 64849 Monterrey, Nuevo León, Mexico
These authors contributed equally to this work.
Authors to whom correspondence should be addressed.
Received: 25 July 2014 / Revised: 5 September 2014 / Accepted: 9 October 2014 / Published: 20 October 2014
(This article belongs to the Special Issue Selected Papers from the 1st International e-Conference on Materials)
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Polypropylene composites with different filler contents were prepared by creating a masterbatch containing 3 wt%. filler. A variety of silanol groups were used to synthetized three compounds in different media trough a sol-gel process with acetic acid, formic acid and ammonium hydroxide as catalysts. Besides, four different nanotubular fillers were also used to analyze their behavior and compare it with the effect caused by the silanol groups. These tubular structures comprise: unmodified halloysite, carbon nanotubes and functionalized halloysite and carbon nanotubes. Morphological characterization in SEM and STEM/TEM showed dispersion in the polypropylene matrix. According to TGA and DSC measurements thermal behavior remain similar for all the composites. Mechanical test in tension demonstrate that modulus of the composites increases for all samples with a major impact for materials containing silanol groups synthetized in formic acid. Rheological measurements show a significantly increment in viscosity for samples containing unmodified and modified carbon nanotubes. No difference was found for samples containing silanol groups and halloysite when compared to neat polypropylene. Finally, the oxygen transmission rate increased for all samples showing high barrier properties only for samples containing natural and functionalized halloysite nanotubes. View Full-Text
Keywords: organosilanes; silanol; halloysite nanotubes; carbon nanotubes; polypropylene; sol-gel process; melt-blending organosilanes; silanol; halloysite nanotubes; carbon nanotubes; polypropylene; sol-gel process; melt-blending

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Monsiváis-Barrón, A.J.; Bonilla-Rios, J.; Sánchez-Fernández, A. Property Relationship in Organosilanes and Nanotubes Filled Polypropylene Hybrid Composites. Materials 2014, 7, 7073-7092.

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