Nanodispersions of carbon nanofiber for polyurethane foaming

Harikrishnan, G.; Singh, S. N.; Kiesel, Elizabeth R.; Macosko, Christopher W.

doi:10.1016/j.polymer.2010.05.017

Cited by 102 publications

(73 citation statements)

References 15 publications

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“…[35] Similar results were observed by microradiology to occur towards the end of the foaming process of a reactive open-cell silicone foam. [17] Nevertheless, cell opening is a complex mechanism and both nondewetting [36] and dewetting [37] effects of nanoclays and carbon nanofibres have been reported in literature. The cell density and sizes appeared to be comparable and, hence, no nucleation effect was observed from the CNTs.…”

Section: Resultsmentioning

confidence: 99%

In situ Foaming Evolution of Flexible Polyurethane Foam Nanocomposites

Bernal

López–Manchado

Verdejo

2011

Macro Chemistry & Physics

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The effect of both as‐produced and functionalised CNTs on the polymerisation evolution of water‐blown PU foams containing up to 0.3 wt.‐% CNTs was studied by in situ FT‐IR spectroscopy. FT‐IR revealed a decrease on the rate of isocyanate conversion as a function of loading fraction for both as‐grown and oxidised CNTs. This dependency suggested that the isocyanate conversion at the early stages of the reaction was governed by the kinetic effects imposed by the presence of the CNTs. The onset of microphase separation was accelerated by the addition of functionalised CNTs (f‐CNTs) but not by as‐produced CNTs due to the different surface functionalities. Measurements of the foaming viscoelastic properties showed an increase on the storage modulus with the CNT content, which indicated the reinforcement of the foam.

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Section: Resultsmentioning

confidence: 99%

In situ Foaming Evolution of Flexible Polyurethane Foam Nanocomposites

Bernal

López–Manchado

Verdejo

2011

Macro Chemistry & Physics

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“…Depending on their composition, polyurethane foams can be characterized by high mechanical resistance, vibration-reducing properties, particular resistance to weather conditions, and resistance to organic solvents and oils. Polyurethane foams have found application in many branches of industry such as construction, furniture production, automotive production, clothing manufacturing, and aviation [17].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and thermal studies of flexible polyurethane nanocomposite foams obtained using nanoclay modified with flame retardant compound

Piszczyk

Danowska

Mietlarek-Kropidłowska

et al. 2014

J Therm Anal Calorim

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This work presents thermal studies of nanocomposites based on the flexible polyurethane (PU) matrix and filled using montmorillonite organically modified with organophosphorus flame retardant compound. Flexible PU nanocomposite foams were prepared in the reaction carried out between reactive alcoholic hydroxyl and isocyanate groups with the ratio of NCO to OH groups equal to 1.05. The amount of an organoclay ranging from 3 to 9 vol% was added to the polyol component of the resin before mixing with isocyanate. The apparent density of PU foams was ranging from 0.066 to 0.077 g cm -1 . Thermal properties of the flexible PU nanocomposite foams were investigated by thermogravimetry and dynamical mechanical analysis. Glass transition temperatures (T g ) were defined as maximum peak on tand curve. Thermal decomposition was observed at 310-320°C (calculated from the onset of TG curve). Tensile strength of the PU foams was determined using mechanical test. The microstructure of the nanoparticles and the composites was investigated by X-ray diffraction. Finally, it was confirmed that the thermal and mechanical properties of flexible PU nanocomposite depend on the amount of nanoclay.

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“…8 CNFs are carbon materials that present a cylindrical shape similar as carbon nanotubes (CNTs) but with differential structural and textural characteristics, diameters in the range of 100-200 nm, length up to 500 m and bundles with a diameter less than 1800 m. One positive characteristic of CNFs with respect to CNTs is the easier production technology existing for the former. 9 However, unmodified CNFs are subjected to aggregation into packed ropes or entangled networks due to the strong inter-fibber van der Waals attraction, [10][11][12] which acts as an obstacle to applications and constitutes the main concern of this study. Different approaches have been proposed to improve the dispersion of CNFs into ceramic matrices such as the use of ultrasounds in diluted suspensions, milling techniques, functionalization by chemical routes, colloidal processing or sol-gel technology.…”

Section: Introductionmentioning

confidence: 99%

Rheological behaviour of submicron mullite–carbon nanofiber suspensions for Atmospheric Plasma Spraying coatings

Rodriguez

Cano

Fernández

et al. 2014

Journal of the European Ceramic Society

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Please cite this article in press as: Rodríguez D, et al. AbstractMullite is widely used as a structural material for applications like thermal and environmental barriers coatings. For some of these applications, thermal spray is a suitable technique due to its fast production time and versatility. This makes mullite a very interesting coating material for thermal spray industry. In the present work, the viability to produce coatings by thermal spray using mullite-CNFs agglomerated powders is analyzed. The stability of aqueous mullite and mullite-CNFs suspensions was studied in terms of zeta potential and rheological behaviour of concentrated slurries. Slurries were optimized in terms of dispersant concentration and solid content. The optimized suspensions were used for the granules preparation by spray drying technology. The obtained granules were characterized through the determination of particle size distribution and shape factor by field emission scanning electron microscopy and laser scattering. These granules were used to form the coatings by Atmospheric Plasma Spraying which were characterized by evaluating the composition, structure, shape, and thickness.

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Nanodispersions of carbon nanofiber for polyurethane foaming

Cited by 102 publications

References 15 publications

In situ Foaming Evolution of Flexible Polyurethane Foam Nanocomposites

In situ Foaming Evolution of Flexible Polyurethane Foam Nanocomposites

Synthesis and thermal studies of flexible polyurethane nanocomposite foams obtained using nanoclay modified with flame retardant compound

Rheological behaviour of submicron mullite–carbon nanofiber suspensions for Atmospheric Plasma Spraying coatings

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