INSTITUTUL NAÅ¢IONAL DE CERCETARE-DEZVOLTARE - ICECHIM

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2. Multifunctional materials and nanocomposites - PNEW POLYPROPYLENE NANOCOMPOSITES BASED ON NON-COVALENTLYFUNCTIONALIZED CARBON NANOTUBES. STUDY OF PROPERTIESFulga TANASA, Madalina ZANOAGA“Petru Poni” Institute of Macromolecular Chemistry, Iasi, Romania41 A Grigore Ghica Voda Alley, Iasi, RomaniaNon-covalent functionalization of carbon nanotubes (CNTs) is a promising approachin terms of improving CNTs dispersion. However, even if a good dispersion has beenachieved in a specific polymer matrix by melt blending, co-precipitation or in-situpolymerization using unmodified CNTs, they are generally poorly dispersed within polymericmatrices, resulting in a slight improvement of composites properties.Non-covalent functionalization of CNTs is, basically, a compatibilization and relies onthe use of polymers bearing aromatic molecules able to undergo π-π stacking with the CNTssurface. This technique allows nanotubes to preserve their structure and electronic propertiesunmodified.When the matrix is also functionalized, good results are expected. In example,polypropylene-graft-maleic anhydride (PP-g-MA) has been used as a compatibilizer toimprove the unmodified CNTs dispersion within polymeric matrix 1-2 , but the conductivityimprovement was not satisfactory.Due to their ability to impart their properties to the corresponding composites, even ata low content, as consequence of their high aspect ratio, CNTs are used in variousapplications as compound/nanocomposite materials, electronic devices, nano(bio)sensors orgas storage materials, etc., they are all intensively investigated.In this paper, we are introducing a new series of nanocomposites based on modifiedPP, namely PP-g-MA, grafted with aromatic moieties, namely aminomethylpyridine (AMP)or amino-pyrene derivative (Py-NH 2 ), able to interact with the surface of CNTs. In the case ofPy-NH 2 , the amine group serves to anchor the molecules by reaction with maleic anhydridefunctions of PP-g-MA. The effect of the dispersion method on the properties of thenanocomposites was studied by rheological and conductivity measurements. Experimentalresults showed that both compatibilizers were able to increase the conductivity of PP/CNTsnanocomposites.References:1. S. H. Lee, M. W. Kim, S. H. Kim, J. R. Youn, European Polymer Journal 44(6), 1620 (2008).2. B.-X. Yang, J.-H. Shi, K. P. Pramoda, S. H. Goh, Composites Science and Technology 68(12), 2490 (2008).
2. Multifunctional materials and nanocomposites - PSTUDY ON THE INFLUENCE OF A LAYERED SILICATE ON THE THERMALAND MECHANICAL PROPERTIES OF NOVEL HYBRID COMPOSITESBASED ON AN ALIPHATIC COPOLYAMI<strong>DE</strong>Madalina Zanoaga, Raluca Darie, Fulga Tanasa“Petru Poni” Institute of Macromolecular Chemistry41 A Grigore Ghica Voda Alley, Iasi, RomaniaAliphatic polyamides (nylons) are an important group of thermoplastics which ndmany new industrial applications due to their good processability, high mechanical strengthand durability and excellent solvent resistance. Use of layered silicates (clays) asreinforcement has recently gained momentum for designing new polyamide compositesendowed with a wide array of markedly enhanced properties. The enhanced properties ofthese hybrid composites include mechanical, thermal, barrier, and flammability and arerelated to the dispersion and nanostructure of the layered silicate in the polymer matrix.The novelty of this work is the fact that we use a layered silicate from our region (aRomanian bentonite) and a random copolyamide. The effect of bentonite on compositesproperties was analyzed comparatively with a commercial layered silicate, namelyMontmorillonite K 10.A small amount of clay (5%) was used. Composites were prepared by meltcompounding. The new hybrid composites were characterized by thermal and mechanicalanalysis. Properties of the polymer-clay composites were compared to those of neatcopolyamide.Thermogravimetry analysis indicated a similar thermal behavior between copolyamideand its hybrid composites. This can be attributed to interactions between polymer chains andthe clay components.The mechanical tests yielded in interesting and promising results. Addition of only 5%clay has led to a tremendous improvement in the stiffness of hybrid composites. Tensile testsindicated that the elastic modulus of hybrid composites increased with 44-48%, while thetensile strength was not significantly affected. The elongation at break of compositesregistered a spectacular increase: 252% (the samples become very ductile), while the ductilitydecreased when Montmorillonite K10 was used as additive.Generally, data suggested that the Romanian clay can be used as a reinforcing additivein copolyamide hybrid composites with better results than Montmorillonite K10.
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INSTITUTUL NAÅ¢IONAL DE CERCETARE-DEZVOLTARE - ICECHIM

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