In-situ determination of amine/epoxy and carboxylic/epoxy exothermic heat of reaction on surface of modified carbon nanotubes and structural verification of covalent bond formation

Neves, Juliana Cardoso; Castro, Vinícius G. de; Assis, Ana L.S.; Veiga, Amanda Garcez; Rocco, Maria Luiza M.; Silva, Glaura G.

doi:10.1016/j.apsusc.2017.12.031

Cited by 19 publications

(11 citation statements)

References 24 publications

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“…Regarding the M-pCNT/EP composite, there was a strong interfacial bonding between the carboxylated carbon nanotubes and EP because of a strong p–p interaction of the carboxyl group. 34 Meanwhile, EP inherently contained pendant hydroxyl groups alongside the molecular chain. These −OH species could form strong bonds or polar attractions to oxide or hydroxyl on the surfaces of metals.…”

Section: Resultsmentioning

confidence: 99%

Application of Carbon Nanotubes from Waste Plastics As Filler to Epoxy Resin Composite

Wang

Cai

Yang

et al. 2022

ACS Sustainable Chem. Eng.

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Carbon nanotubes (CNTs) are promising nanofillers to enhance the mechanical performance of polymers. Through catalytic conversion, waste plastics can be converted into CNTs, which could be an alternative to commercial CNTs (cCNTs). Exploring a practical application of waste-plastic-derived CNTs will largely promote the technology development related to waste plastic management and CNT production. In this work, CNTs produced from plastics, named pCNTs, were applied as fillers to epoxy resin (EP), while commercial CNTs (cCNTs) were used as a reference. The carboxyl groups were effectively inserted on the CNT skeleton by a facile purification and modification. After ultrasonic dispersion, the modified pCNTs (M-pCNTs) were uniformly dispersed and loaded in the EP matrix. Better mechanical properties than EP were attained with a Young’s modulus of 3776.9 MPa, a tensile strength of 37.3 MPa, a fracture strain of 6.32%, and a fracture strength of 111.7 MPa with 2 wt % M-pCNT loading. Thus, pCNTs enhanced the toughness of the EP composites and simultaneously retained the stiffness. It was suggested that CNT pull-out and bridging were predominant toughening mechanisms for pCNT/EP composites. Notably, the coated film developed between residual metal in M-pCNTs and EP built a strong interfacial interaction and reinforced the EP composites.

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Section: Resultsmentioning

confidence: 99%

Application of Carbon Nanotubes from Waste Plastics As Filler to Epoxy Resin Composite

Wang

Cai

Yang

et al. 2022

ACS Sustainable Chem. Eng.

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“…XPS analysis is an efficient method to evaluate the chemical bonds grafted onto CNTs [ 40 ]. Figure 2 and Figure 3 show the XPS spectra of prime and PABA-modified MWCNTs.…”

Section: Resultsmentioning

confidence: 99%

“…The presence of these two peaks indicated that PABA had been grafted successfully onto the surface of the MWCNTs. XPS analysis is an efficient method to evaluate the chemical bonds grafted onto CNTs [40]. Figures 2 and 3 show the XPS spectra of prime and PABA-modified MWCNTs.…”

Section: Structural Characterizationmentioning

confidence: 99%

Rapid Preparation of MWCNTs/Epoxy Resin Nanocomposites by Photoinduced Frontal Polymerization

et al. 2020

Materials

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Due to their excellent mechanical and thermal properties and medium resistance, epoxy/carbon nanotubes and nanocomposites have been widely used in many fields. However, the conventional thermosetting process is not only time- and energy-consuming, but also causes the agglomeration of nanofillers, which leads to unsatisfactory properties of the obtained composites. In this study, multi-walled carbon nanotubes (MWCNTs)/epoxy nanocomposites were prepared using UV photoinduced frontal polymerization (PIFP) in a rapid fashion. The addition of MWCNTs modified by a surface carboxylation reaction was found to enhance the impact strength and heat resistance of the epoxy matrix effectively. The experimental results indicate that with 0.4 wt % loading of modified MWCNTs, increases of 462.23% in the impact strength and 57.3 °C in the glass transition temperature Tg were achieved. A high-performance nanocomposite was prepared in only a few minutes using the PIFP approach. Considering its fast, energy-saving, and environmentally friendly production, the PIFP approach displays considerable potential in the field of the fast preparation, repair, and deep curing of nanocomposites and coatings.

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“…However, a key difference in our studies, as compared with the previous work, was that we explored the impact of modifying not only the terminal ligand moiety but also the attachment approach. With respect to the latter issue, the problem with covalent functionalization is that robust treatment protocols, usually involving strong, destructive acids (such as HNO 3 and H 2 SO 4 as illustrative examples), can lead to a loss of not only the structural integrity but also, consequentially, the favorable electronic properties of the CNTs, 127 all of which could dramatically reduce both activity and long-term stability. 128 Hence, our preference revolved around a less intrusive and less damaging noncovalent, physical sonication-mediated approach.…”

Section: Choice Of Catalyst Supportmentioning

confidence: 99%

Ultrathin Metallic Nanowire-Based Architectures as High-Performing Electrocatalysts

Wong

2018

ACS Omega

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Fuel cells (FCs) convert chemical energy into electricity through electrochemical reactions. They maintain desirable functional advantages that render them as attractive candidates for renewable energy alternatives. However, the high cost and general scarcity of conventional FC catalysts largely limit the ubiquitous application of this device configuration. For example, under current consumption requirements, there is an insufficient global reserve of Pt to provide for the needs of an effective FC for every car produced. Therefore, it is absolutely necessary in the future to replace Pt either completely or in part with far more plentiful, abundant, cheaper, and potentially less toxic first row transition metals, because the high cost-to-benefit ratio of conventional catalysts is and will continue to be a major limiting factor preventing mass commercialization. We and other groups have explored a number of nanowire-based catalytic architectures, which are either Pt-free or with reduced Pt content, as an energy efficient solution with improved performance metrics versus conventional, currently commercially available Pt nanoparticles that are already well established in the community. Specifically, in this Perspective, we highlight strategies aimed at the rational modification of not only the physical structure but also the chemical composition as a means of developing superior electrocatalysts for a number of small-molecule-based anodic oxidation and cathodic reduction reactions, which underlie the overall FC behavior. In particular, we focus on efforts to precisely, synergistically, and simultaneously tune not only the size, morphology, architectural motif, surface chemistry, and chemical composition of the as-generated catalysts but also the nature of the underlying support so as to controllably improve performance metrics of the hydrogen oxidation reaction, the methanol oxidation reaction, the ethanol oxidation reaction, and the formic acid oxidation reaction, in addition to the oxygen reduction reaction.

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In-situ determination of amine/epoxy and carboxylic/epoxy exothermic heat of reaction on surface of modified carbon nanotubes and structural verification of covalent bond formation

Cited by 19 publications

References 24 publications

Application of Carbon Nanotubes from Waste Plastics As Filler to Epoxy Resin Composite

Application of Carbon Nanotubes from Waste Plastics As Filler to Epoxy Resin Composite

Rapid Preparation of MWCNTs/Epoxy Resin Nanocomposites by Photoinduced Frontal Polymerization

Ultrathin Metallic Nanowire-Based Architectures as High-Performing Electrocatalysts

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