Influence of carbon nanotubes functionalization on the mechanical properties of polymethacrylate nanocomposites

Zamfirova, Galina; Gaydarov, Valentin; Faraguna, Fabio; Vidović, Elvira; Jukić, Ante

doi:10.1016/j.colsurfa.2016.08.031

Cited by 25 publications

(10 citation statements)

References 33 publications

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“…In accord with expectations, H IT values were higher in comparison with corresponding H M values due to pile‐up and other viscosity‐related effects. [ 58–61 ] The fact that higher dwell times resulted in lower hardness values (Figures 3 and 4) due to higher creep (Figure 5) corresponded to the theoretical predictions as well (higher creep mean higher size of indents and, as a result, lower hardness). Finally, Table 3 documents that all correlations between Y , H IT and H M were strong as their Pearson correlation coefficients r were very close +1, whereas the correlations between Y , E and E IT were somewhat weaker, with Pearson correlation coefficients ~0.7.…”

Section: Resultssupporting

confidence: 73%

“…[ 49 ] Moreover, the indentation hardness of semicrystalline polymers tends to be higher than Vickers or Martens hardness ( H IT > H V ≈ H M ). [ 58–61 ] Additional complexity is the relation between macroscopic moduli and microscale indentation modulus of polymers, which is usually higher due to pile‐up and viscoelasticity‐related effects ( E IT > E ). [ 48, 62 ] Last but not the least, all proportionality constants in Equation (7) are influenced by the fact that both macroscale and microscale properties of polymers are time dependent, which means that their values change with loading/unloading rate, loading time, and/or frequency during dynamic experiments.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Macromechanical and micromechanical properties of polymers with reduced density of entanglements

Šlouf

Krajenta

Gajdošová

et al. 2021

Polymer Engineering & Sci

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The macromechanical and micromechanical properties of polypropylene, polylactide, and polystyrene with different entanglement densities and different crystallinities were tested. The mechanical properties were characterized by macroscale compression tests and microindentation hardness measurements. The entanglement density modified the mechanical properties only in the high‐deformation region, above the yield point, when the strain‐hardening occurred, and ca 10% lower stresses were measured for disentangled polymers. In the low‐deformation region, the influence of the entanglement density was negligible. The stiffness of semicrystalline polymers increased with their crystallinity and the stiffness of amorphous polymers increased with their glass transition temperature. For example, the elastic modulus was equal to 1.59 MPa for entangled polylactide, 1.68 MPa for partially disentangled polylactide, and 2.20 MPa for semicrystalline, disentangled polylactide. The stiffness‐related properties in both macroscale (compressive modulus, E, and yield stress, Y) and microscale (indentation modulus, EIT and indentation hardness, HIT) showed very similar trends, which was in perfect agreement with theoretical predictions and confirmed the reliability of our results. The supplementary, viscosity‐related properties from microindentation experiments (indentation creep, CIT, and elastic part of indentation work, ηIT) supported the above‐mentioned conclusions in the sense that also these two low‐deformation region properties were independent on the entanglement density.

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Section: Resultssupporting

confidence: 73%

Section: Theoretical Backgroundmentioning

confidence: 99%

Macromechanical and micromechanical properties of polymers with reduced density of entanglements

Šlouf

Krajenta

Gajdošová

et al. 2021

Polymer Engineering & Sci

View full text Add to dashboard Cite

show abstract

“…These multi-functionalities have opened new possibilities for potential industrial applications of polymer nanocomposites. It has been well-documented that the addition of CNTs significantly affects short-term properties of thermoplastic polymers and an increase in elastic modulus and yield stress has been reported for a wide range of thermoplastic matrices including PE [13][14][15][16][17], PS [18][19][20], PMMA [21][22][23][24], PP [25][26][27][28], PA [29][30][31], PC [32][33][34][35], and many more.…”

Section: Introductionmentioning

confidence: 99%

Long-term performance and durability of polycarbonate/carbon nanotube nanocomposites

et al. 2018

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Due to their good mechanical properties, low density, and ease of processing polymer nanocomposites are of interest for a multitude of applications in the automotive, electronics, and leisure industry. Besides having an impact on short-term mechanical performance of polymers, the addition of nanoreinforcements can have also a significant effect on long-term properties such as the resistance to static (creep) and cyclic (fatigue) loadings. However, despite its significance there is a shortage of long-term mechanical performance data for thermoplastic-based polymer nanocomposites. Reason being that existing characterization methods for long-term performance and durability are time consuming and limited in their applicability. Here, an engineering approach to predict long-term time-to-failure of polycarbonate/carbon nanotube (PC/CNT) nanocomposites is presented based on short-term experimentation with an application to both creep and fatigue. Results showed that the addition of CNTs had an opposite effect on two important long-term failure mechanisms. Addition of CNTs lead to improvements in durability in the plasticity-controlled failure regime, whereas it had an adverse effect in the slow crack growth-controlled regime, meaning that in the latter regime nanocomposite performance was significantly less than that of the neat polymer matrix.

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“…Chemical functionalization of carbon nanotubes has proved effective in improving the characteristics of interfacial interactions and the performance of the resulting nanocomposites [150][151][152][153]. Chemical functionalization of carbon nanotubes, such as wrapping of polymer around carbon nanotubes [154], as illustrated schematically in Figure 7, or introducing covalent interfacial bonding [155], has been achieved.…”

Section: Interactions At the Interfacementioning

confidence: 99%

Recent Advances in Characterization Techniques for the Interface in Carbon Nanotube-Reinforced Polymer Nanocomposites

Chen

Gao

2019

Advances in Materials Science and Engineering

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The current state of characterization techniques for the interface in carbon nanotube-reinforced polymer nanocomposites is reviewed. Different types of interfaces that exist within the nanocomposites are summarized, and current efforts focused on understanding the interfacial properties and interactions are reviewed. The emerging trends in characterization techniques and methodologies for the interface are presented, and their strengths and limitations are summarized. The intrinsic mechanism of the interactions at the interface between the carbon nanotubes and the polymer matrix is discussed. Special attention is given to research efforts focused on chemical functionalization of carbon nanotubes. The benefits and disadvantages associated with covalent and noncovalent functionalization methods are evaluated, respectively. Various techniques used to characterize the properties of the interface are extensively reviewed. How the mechanical and thermal properties of the nanocomposites depend on the physical and chemical nature of the interface is also discussed. Better understanding and design of the interface at the atomic level could become the forefront of research in the polymer community. Potential problems going to be solved are finally highlighted.

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Influence of carbon nanotubes functionalization on the mechanical properties of polymethacrylate nanocomposites

Cited by 25 publications

References 33 publications

Macromechanical and micromechanical properties of polymers with reduced density of entanglements

Macromechanical and micromechanical properties of polymers with reduced density of entanglements

Long-term performance and durability of polycarbonate/carbon nanotube nanocomposites

Recent Advances in Characterization Techniques for the Interface in Carbon Nanotube-Reinforced Polymer Nanocomposites

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