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Propertiy Relationship in Organosilanes and Nanotubes filled Polypropylene Hybrid Composites
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1  Tecnológico de Monterrey Campus Monterrey

Abstract: Polypropylene composites with different filler contents were prepared by creating a masterbatch containing 3% wt. filler with polypropylene (PP). Three compounds with different silanols groups were synthetized in different media trough a sol-gel process where the acetic acid, formic acid and ammonium hydroxide were the different catalysts used to develop such process. Besides, three different nanotubular structures were also used to analyze their behavior and compare it with the impact caused by the silanols groups. These nanotubes comprises: unmodified halloysite (HNT) and carbon nanotubes (CNT) as well as functionalized carbon nanotubes (CNTF). Morphological characterization in SEM and STEM/TEM show the dispersion in the PP matrix. According to TGA measurements CNTF is the composite with better thermal properties when all samples are compared. DSC measurements show the presence of two main peaks for all samples were temperatures of melting and crystallization remain similar for all the composites. Mechanical test in tension demonstrate that modulus of the composites increases for all samples but with major impact for PP containing silanols groups synthetized in formic acid and the lowest improvement was achieved for sample containing the silanols groups synthetized in base media. The oxygen transmission rate increased for all samples with exception of samples containing HNT. Finally, rheological measurements show a significantly increment in viscosity for samples containing unmodified and modified carbon nanotubes. No difference was found for samples containing silanols groups and HNT when compared to neat PP.
Keywords: Organosilanes, silanols, halloysite nanotubes (HNT), carbon nanotubes (CNT), polypropylene, sol-gel process
Comments on this paper
Chuanlai Xu
Interesting properties for applications
The properties arised from the hybrid composites is interesting, the reall applications should be appealing...
Alejandra Monsiváis
The importance of these compounds derives from the possibility of obtaining novel materials through comparing the effect of CNTs which are not eco-friendly materials against organosilanes synthesized in part with "natural" catalysts and HNT which are natural nanotubes. it is expected that these materials have a good impact on barrier properties  and processability in order to analyze and select the best application for iits end use which will be for sure appealing and the most important, usefull  for industry.