Thermomechanical behavior of SBR reinforced with nanotubes functionalized with polyvinylpyridine

Falco, Alejandro; Lamanna, Melisa Elsa; Goyanes, Silvia; D’Accorso, Norma B.; Fascio, Mirta L.

doi:10.1016/j.physb.2011.12.057

Cited by 7 publications

(9 citation statements)

References 9 publications

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“…Although the compression stress–strain methodology is not the more appropriated to obtain accurate values of the Young's modulus (because of the relatively limited range of strain, up to 40%) a raw estimation renders a Young's modulus about (0.8 ± 0.1) kPa for the used SBR, in good agreement with a previous estimation of 1 MPa made by our group in a previous work, although calculated using tensile stress–strain curves for SBR of the same styrene:butadiene ratio . On the other hand, the compression stress–strain curves obtained for the SBR‐18% DEG matrix are not well described by a single exponent fit (which is the behavior predicted by the Young's law), suggesting a complex relaxation process inside the material whose detailed understanding is beyond the scope of this work, requiring systematic experiments including stress–strain tensile tests.…”

Section: Resultssupporting

confidence: 85%

“…Therefore, the results shown in Figure indicate that films present piezoresistivity, that is, variation of σ with Σ. It is reasonable to attribute the piezoresistivity effect to percolation between the conductive needles where the percolation probability increases when the films are compressed, in agreement with the increase of σ increases with Σ (decrease of R in Fig. ).…”

Section: Resultssupporting

confidence: 61%

“…As described in section "Elastic properties of the SBR-DEG elastomers," the observed changes of R cannot be assigned to the trivial effect of decreasing L when increasing R. Therefore, the results shown in Figure 8 indicate that films present piezoresistivity, that is, variation of r with R. It is reasonable to attribute the piezoresistivity effect to percolation between the conductive needles [24][25][26][27][28][29][30][31][32][33] where the percolation probability increases when the films are compressed, in agreement with the increase of r increases with R (decrease of R in Fig. 8).…”

Section: Piezoresistivity Of Sbr-deg-fe 3 O 4 @Ag Structured Filmsmentioning

confidence: 89%

See 2 more Smart Citations

Structured elastomeric submillimeter films displaying magneto and piezo resistivity

Ruiz

Marchi

Pérez

et al. 2015

J Polym Sci B Polym Phys

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Structured elastomer films (100-150 mm) presenting piezo and magneto resistance are described. The films are composites of filler particles, which are both electrically conductive and magnetic, dispersed in an elastomeric matrix. The particles consist of magnetite (6 nm) grouped in silver-coated aggregates (Fe 3 O 4 @Ag). The matrix is styrene-butadiene rubber (SBR) in which diethylene glycol (DEG) is added. The particles, SBR and DEG, are dispersed in toluene and then placed between two rare earth magnets. Formation of pseudo-chains (needles) of inorganic material aligned in the direction of the magnetic field is obtained after solvent evaporation. The addition of DEG is substantial to obtain an electrically conductive material. The electrical conductivity is anisotropic and increases when applying normal stresses and/or magnetic fields in the direction of the needles. The elastomers, particles, and needless were characterized by XRD, SEM, EDS, FTIR, DSC, TGA, VSM, profilometry, and stress-strain analysis.V C 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 00, 000-000 KEYWORDS: composites; elastomers; magnetoresistive composites; piezoresistive elastomers; sensors; structured elastomers INTRODUCTION Structured elastomer composites with anisotropic properties, such as magneto and piezoresistivity, are becoming of great interest for their potential applications in physical sensors, flexible devices, and electronic connectors. [1][2][3][4][5][6][7][8][9] In addition to common challenges for technological application of smart materials (obtaining appropriated quality parameters), there are specific difficulties in the case of structured elastomeric composites: (i) to develop ohmic contacts with good adherence to the elastomer; (ii) to obtain a reversible response (dependent on the elastic behavior); and (iii) to prepare submillimeter films displaying the physical properties of interest. The first two issues (contacts and reversibility) have been addressed in previous works of our group, using magnetorheological elastomers based on dispersions of magnetic nanomaterials in polydimethylsiloxane

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Section: Resultssupporting

confidence: 85%

Section: Resultssupporting

confidence: 61%

Section: Piezoresistivity Of Sbr-deg-fe 3 O 4 @Ag Structured Filmsmentioning

confidence: 89%

See 1 more Smart Citation

Structured elastomeric submillimeter films displaying magneto and piezo resistivity

Ruiz

Marchi

Pérez

et al. 2015

J Polym Sci B Polym Phys

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“…However, chemical modifications on the nanotubes wall can generate substantial changes to the polymer matrix even when added at low weight percentages. 125 Uniform distribution of CNTs within the polymer matrix is critical for maximizing the interfacial bond between the CNTs and polymer matrix in order to achieve optimal improvements in mechanical properties. 126 It has also been reported that alignment and optimum dispersion of CNTs is important to enhance the thermal properties of a nanocomposite.…”

Section: Carbon Nanotubesmentioning

confidence: 99%

Acrylic Bone Cements: The Role of Nanotechnology in Improving Osteointegration and Tunable Mechanical Properties

Lissarrague¹,

Fascio²,

Goyanes³

et al. 2014

j biomed nanotechnol

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Nanotechnology is an extremely powerful emerging technology, which is expected to have a substantial impact on biomedical technology, especially in tissue engineering and drug delivery. The use of nanocompounds and nanoparticles in the synthesis of improved bone cements to be applied in vertebroplasty/kyphoplasty and arthroplasty, is of great interest due to the increasing incidence of osteoporosis and osteoarthritis. This review reports new advances in the development of acrylic bone cements, using different radio-opalescent nanomaterials taking into consideration their influence on the mechanical behavior and biocompatibility of the resulting acrylic bone cement. Furthermore, other non-radiopaque nanoparticles capable of mechanically reinforcing the bone cement as well as induce osteointegration, are also reviewed. Additionally, nanoparticles used to improve the controlled release of antibiotics contained in acrylic bone cements are briefly described.

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“…A crosslinked rubber has better thermal stability, mechanical strength, aging resistance, abrasion resistance, weather resistance and tear strength compared with pristine rubber. 6,7 Different fillers (nanoclays, nanocarbon, nanosilica, carbon nanotubes (CNTs), graphene, silicon carbide, alumina, and so forth) have been used to tailor the thermal, mechanical, adhesion and abrasion properties of SBR. [8][9][10] SBR is widely used in the tire industry.…”

Section: Introductionmentioning

confidence: 99%

Multiwalled carbon nanotubes impregnated rubber nanocomposites: thermal transport/decomposition and differential scanning calorimetric study

Sagar

Iqbal

Maqsood

2013

Journal of Reinforced Plastics and Composites

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In order to analyze the effect of multiwalled carbon nanotubes on the thermal transport/stability characteristics of styrene butadiene rubber, five diverse loadings of multiwalled carbon nanotubes were impregnated in the rubber matrix using dispersion kneader and two roller mixing mill. Thermal conductivity and thermal impedance of the nanocomposite specimens were evaluated according to ASTM E1225-99 and D5470-03. It was observed that the thermal conductivity was reduced up to 79% while thermal impedance of the polymer nanocomposite was improved up to 390% at 523 K with 1 wt% impregnation of nanotubes into the base composite formulation. Thermal stability of the polymer nanocomposite was augmented up to 6%, with the utmost incorporation of the nanotubes. Glass transition and crystallization temperatures were diminished, while the onset and peak melting temperatures were increased with increasing filler to matrix ratio. The percent crystallinity of the nanocomposites has been augmented up to 5%, with 1 wt% incorporation of multiwalled carbon nanotubes into the host matrix. Scanning electron microscopy along with energy dispersive X-ray spectroscopy was used to examine the multiwalled carbon nanotubes dispersion in the rubber matrix, for surface analysis of the post-thermally tested composite specimens and for their compositional analysis.

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Thermomechanical behavior of SBR reinforced with nanotubes functionalized with polyvinylpyridine

Cited by 7 publications

References 9 publications

Structured elastomeric submillimeter films displaying magneto and piezo resistivity

Structured elastomeric submillimeter films displaying magneto and piezo resistivity

Acrylic Bone Cements: The Role of Nanotechnology in Improving Osteointegration and Tunable Mechanical Properties

Multiwalled carbon nanotubes impregnated rubber nanocomposites: thermal transport/decomposition and differential scanning calorimetric study

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