Use of nanoindentaion and nanoscratch experiments to reveal the mechanical behavior of POSS containing polyurethane nanocomposite coatings: The role of functionality

Ghermezcheshme, Hassan; Mohseni, Mohsen; Yahyaei, Hossein

doi:10.1016/j.triboint.2015.02.023

Cited by 34 publications

(24 citation statements)

References 46 publications

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“…Moreover, the nanoscratch test probes a much higher volume than the nanoindentation test. To slide along the established path, the indenter needs more strength to overcome the nanotube network …”

Section: Resultsmentioning

confidence: 99%

High performance polyurethane composites with isocyanate‐functionalized carbon nanotubes: Improvements in tear strength and scratch hardness

Lopes

Ribeiro

Santos

et al. 2016

J of Applied Polymer Sci

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A microwave‐assisted functionalization of carbon nanotubes (CNTs) with isocyanate groups allowed a reduction of functionalization time from 24 h to 30 min with no change in the degree of functionalization or in the nanotube characteristics. Polymer nanocomposites with enhanced mechanical properties were obtained because of the tailored interface by the covalent linkage between the surface‐modified multiwalled‐carbon nanotubes (MWCNTs) and an elastomeric polyurethane (PUE) matrix. The mechanical data revealed that the composite containing 0.25 wt % of MWCNT‐NCO showed an increase of 31% in tear strength and 28% in static toughness. A good adhesion between the matrix and individually dispersed nanotubes was observed in the scanning electron microscopy and transmission electron microscopy images. Nanoindentation and nanoscratch experiments were conducted to investigate the properties on the sub‐surface. An increase by a factor of 3 in the scratch hardness was observed for the composite with 0.50 wt % of MWCNT‐NCO with respect to the neat PUE. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44394.

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Section: Resultsmentioning

confidence: 99%

High performance polyurethane composites with isocyanate‐functionalized carbon nanotubes: Improvements in tear strength and scratch hardness

Lopes

Ribeiro

Santos

et al. 2016

J of Applied Polymer Sci

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“…The increase in the nanocomposites hardness is justified by some authors, due to the formation of cross-links with the polymer chains and the epoxy resin, the functionality of POSStri and POSSocta makes the chains mobility difficult, possibly presenting free spaces, as well as forming clusters which makes the film more rigid. This rigidity may possibly be associated with the epoxy resin chains movement to be restricted by the presence of the POSS nanocages, due to its functionality, leading to a higher resistance to deformation 10,18,32,33 . This rigidity of the system containing POSStri is an aggravating factor for the low electrochemical resistance, when compared to the other systems studied, mainly in the first hours of contact with the electrolyte, since this coating facilitates the permeation of the electrolyte.…”

Section: Ocpmentioning

confidence: 99%

“…This hardness increase of the system containing POSSocta can be related to the movement of the epoxy resin chains be restricted due to the presence of the POSSocta nanocages, and the formation of agglomerates, because of the high functionality, occasioning higher resistance to deformation and, consequently, higher hardness 10,18,32 . Meanwhile, the system containing POSSmono is more flexible when compared to the sample containing POSSocta, due to the lower functionality, which promotes more mobility of the polymeric chains and, thus, an efficient dispersion, obtaining a more homogeneous film 18,31,33 .…”

Section: Flexibility Testmentioning

confidence: 99%

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Evaluation of the Mechanic and Electrochemical Properties of an Epoxy Coating with Addition of Different Polyhedral Oligomeric Silsesquioxanes (POSS) Applied on Substrate of Low Alloy Steel

et al. 2017

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The epoxy resin is one of the matrices most employed in obtaining composites and coatings. Its properties have been modified using materials such as clays and polyhedral oligomeric silsesquioxanes -POSS. The use of POSS in the preparation of thermosetting nanocomposites has been studied in obtaining hybrid materials with higher mechanic and surface properties. The functionality of POSS cage is important, since a thermosetting is formed by a cross-linked structure that can interact at any direction, forming bonds or acting in the interface of the cages inserted. This works aims to evaluate the influence of three POSS (Glycidylisobutyl-POSS, Triglycidylisobutyl-POSS and Glycidyl-POSS) added in epoxy resin, in the mechanic and electrochemical behaviors, when applied on low alloy steel. It was observed an increase in roughness and hydrophobicity. The sample containing Glycidylisobutyl-POSS presented the best results of corrosion resistance. Glycidyl-POSS showed an inefficient dispersion, forming agglomerates, leading to a low electrochemical behavior.

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“…The aim was to determine the particle size of the silica particles and observe the distribution, alignment and orientation of nano-silica particles in the coated film thereby correlating them with the mechanical properties offered by them. The coating films were microtomed and then they were seen for the microstructure under FEGTEM [12].…”

Section: Dispersion Studiesmentioning

confidence: 99%

Development and Evaluation of Nano-Silica Dispersed Polyurethane Based Coatings for Improved Anti-Graffiti and Scratch Resistance

Adapala¹,

Gaur²,

Puri³

et al. 2015

OJAppS

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Polyurethane based anti-graffiti coatings have been developed by incorporating varying amounts of OH-functional Silicone modified polyacrylate. Optimization of Silicone polyacrylate concentration in neat PU was done by testing its performance for graffiti resistance. Tests which include static contact angle measurements with water and spray paint, visual inspection of stain removal and color change measurements were performed. It was observed that 5 wt % of Silicone polyacrylate in the neat PU showed 95% stain removability. These coatings showed excellent graffiti resistance but poor mechanical properties. Hence modification of these coatings was done by nano-particle incorporation. Nano-silica particle concentration was optimized for surface mechanical properties such as surface hardness, elastic modulus and scratch resistance. FEG-TEM revealed that nano-silica particles were uniformly distributed over the surface. 5 wt % nano-silica particle additions in PU-5 wt % silicone polyacrylate base showed superior mechanical properties than other concentrations. Color change measurements showed that nano-silica particle addition had no effect on its graffiti resistance. Hence PU-5 wt % silicone polyacrylate, 5 wt % nano-silica showed excellent graffiti resistance and mechanical properties.

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Use of nanoindentaion and nanoscratch experiments to reveal the mechanical behavior of POSS containing polyurethane nanocomposite coatings: The role of functionality

Cited by 34 publications

References 46 publications

High performance polyurethane composites with isocyanate‐functionalized carbon nanotubes: Improvements in tear strength and scratch hardness

High performance polyurethane composites with isocyanate‐functionalized carbon nanotubes: Improvements in tear strength and scratch hardness

Evaluation of the Mechanic and Electrochemical Properties of an Epoxy Coating with Addition of Different Polyhedral Oligomeric Silsesquioxanes (POSS) Applied on Substrate of Low Alloy Steel

Development and Evaluation of Nano-Silica Dispersed Polyurethane Based Coatings for Improved Anti-Graffiti and Scratch Resistance

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