Nanoparticles reinforcing effect

Overall the results led to the conclusion that acetylated nanoparticles of both starch and cellulose offer potential eco-friendly substitutes for the conventional filler carbon black upto 40 phr. They imparted high mechanical strength and elasticity with minimum compromise in themal stability and moisture absorption of the resulting bionanocomposites. Cellulose acetate nanoparticles afforded effective reinforcement even upto loadings as high as 50 phr. [Pg.129]

The results obtained by Kuila et al. and Acharya et al. [63,64] from the EVA elastomer blended with lamellar-like Mg-Al layered double hydroxide (LDH) nanoparticles demonstrate that MH nanocrystals possess higher flame-retardant efficiency and mechanical reinforcing effect by comparison with common micrometer grade MH particles. Kar and Bhowmick [65] have developed MgO nanoparticles and have investigated their effect as cure activator for halogenated mbber. The results as shown in Table 4.2 are promising. [Pg.96]

Chauve et al. [253] utilized the same technique to examine the reinforcing effects of cellulose whiskers in EVA copolymer nanocomposites. It was shown that larger energy is needed to separate polar EVA copolymers from cellulose than for the nonpolar ethylene homopolymer. The elastomeric properties in the presence of spherical nanoparticles were studied by Sen et al. [254] utilizing Monte Carlo simulations on polypropylene matrix. They found that the presence of the nanofillers, due to their effect on chain conformation, significantly affected the elastomeric properties of nanocomposites. [Pg.76]

Hence, the stated aforementioned results have shown that the elastomeric reinforcement effect is the true nanoeffect, which is defined by the initial nanofiller particle size only. The indicated particle aggregation, always taking place in real materials, changes and reduces reinforcement degree quantitatively. This effect theoretical treatment can be received within the frameworks of fractal analysis. For the considered nanocomposites the nanoparticle size upper limiting value makes up 52 nm. [Pg.172]

Well-defined particles have been obtained from PDMS containing different additives, using the surfactant depicted in Scheme 9. For example, metal nanoparticles, or crystalline compounds may be encapsulated in PDMS and the resulting particles are better defined and stable after drying (Figure 3), probably due to a reinforcing effect. The same result was observed in the case of PCL nanoparticles with encapsulated indomethacine. In that case, the colloidal stability was visibly increased compared to the neat polymer [92],... [Pg.228]

The increase in magnetic properties of vulcanized NR clearly shows that the ferromagnetic characteristics of nickel particles are retained in the composites. The elastic modulus of the samples shows improvement as the nickel content in the composites increases. The increase in the strains modulus as the amount of nickel increases reflects the reinforcing effect of nickel nanoparticles in NR matrix. However, there is a monotonous decrease in elongation at break with the increase in filler loading. This may be due the formation of agglomerates of filler particles in the NR matrix. [Pg.42]

Moreover Ponomarenko et al. reported the melt-compounded composites of synthetic styrene-co-butadiene mbber (BUNA SL18) and silica particles (Silica VN3, Degussa). They showed that at low elongations, silica particles provided a considerably weaker reinforcement effect of the mbber matrix when compared to organoclay nanoparticles. The overall tiiermoelastic behavior of both the mbber/ silica composites and the mbber/organoclay nanocomposites could be quantitatively... [Pg.179]

Scotti, R., Conzatti, L., D Arienzo, M., Di Credico, B., (liannini, L., Hand, T., Stagnaro, P., Susanna, A., Tadiello, L., Morazzoni, F. Shape controlled spherical (OD) and rod-like (ID) silica nanoparticles in silica/styrene butadiene mbber nanocomposites role of the particle morphology on the filler reinforcing effect. Polymer 55, 1497-1506 (2014)... [Pg.190]

In the previous section, it was outlined how the thermal stability of bio-nanocom-posites is more related to the type and to the modification of the nanopaiticle dispersed within the hiopolymer, than to do with any reinforcement effect attributable to the nanoparticle. Different nanoparficles have different effects on the thermal stability of biopolymers. Nanoclay can greatly enhance the thermal stability of a number of different biopolymers—PLA [48,63], POL [67], starch [68,69] and PHBV [65]. As... [Pg.234]

Tensile properties are, by far, the most widely studied mechanical properties of eco-friendly polymer nanocomposites. Overall, the mechanical performance of CNC-reinforced composites depends on the aspect ratio, crystallinity, processing method, and CNC/matrix interfacial interaction. The mechanical properties are proportional to aspect ratio and crystaUinify of nanoreinforcement and it has been shown that increase in aspect ratio and crystaUinify results in increase in mechanical properties. Slow processing methods which encourage water evaporation result in composites with improved properties. This is because nanoparticles have suflticient time to interact and connect to form a continuous network, which is the basis of their reinforcing effect. Nanoreinforcement which is compatible with the biopolymer matrix also exhibits improved mechanical properties of the nanocomposites. [Pg.532]

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