| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Wilkinson, Arthur N.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (26/26 displayed)
- 2024Nanoplatelet Orientation and Young’s Modulus of Graphene/Phenoxy Nanocomposites
- 2021Optimization of Glass Transition Temperature and Pot Life of Epoxy Blends Using Response Surface Methodology (RSM)
- 2019Investigation of Thermal Stability of Non-Newtonian Melt Flowscitations
- 2019Addition of graphite filler to enhance electrical, morphological, thermal, and mechanical properties in poly (ethylene terephthalate)citations
- 2019Addition of graphite filler to enhance electrical, morphological, thermal, and mechanical properties in poly (ethylene terephthalate):Experimental characterization and material modelingcitations
- 2018Mechanical characterization of thin injection-moulded polypropylene specimens under large in-plane shear deformationscitations
- 2018Carbon Nanotube Hybrids and Their Polymer Nanocomposites
- 2018Interlaminar stresses in Glass-Cellulose Epoxy L Bend Hybrid Compositescitations
- 2017Electrical, Thermal, and Morphological Properties of Poly (ethylene terephthalate)-Graphite Nanoplatlet Nanocompositescitations
- 2016Low Viscosity Processing using Hybrid CNT-coated Silica Particles to Form Electrically Conductive Epoxy Resin Compositescitations
- 2014Deformation micromechanics of all-cellulose nanocomposites: Comparing matrix and reinforcing componentscitations
- 2013Orientation and deformation of wet-stretched all-cellulose nanocompositescitations
- 2012The influence of PES and triblock copolymer on the processing and properties of highly crosslinked epoxy matrices
- 20123D characterisation of void distribution in resin film infused composites
- 2012Deformation Micromechanics of All-cellulose Nanocomposites: Comparing Matrix Components
- 2012Influence of magnetic field alignment of cellulose whiskers on the mechanics of all-cellulose nanocompositescitations
- 2010Discrimination of matrix-fibre interactions in all-cellulose nanocompositescitations
- 2010Structure development and interfacial interactions in flexible polyurethane foam-layered silicate nanocompositescitations
- 2008Structure development in flexible polyurethane foam nanocomposites
- 2008Interfacial interactions in polymer-layered silicate nanocompositescitations
- 2007Evaluation of an alternative modification route for layered silicates and synthesis of poly(styrene) layered silicate nanocomposites by in-situ suspension polymerization
- 2007Tensile properties of melt intercalated polyamide 6 - Montmorillonite nanocompositescitations
- 2007Structure development in flexible polyurethane foam-layered silicate nanocompositescitations
- 2006Aspects of the thermal and photostabilisation of high styrene-butadiene copolymer (SBC)citations
- 2006Structure and dynamic mechanical properties of melt intercalated polyamide 6 - Montmorillonite nanocompositescitations
- 2003Structural composites formed by reaction injection moulding: Interlaminar fracture properties of glass fibre mat-copoly(urea/isocyanurate) resin composites
Places of action
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article
Structure development and interfacial interactions in flexible polyurethane foam-layered silicate nanocomposites
Abstract
Unmodified Na-montmorillonite (MMT) was swollen in a polyol/water mixture using an ultrasound technique. Polyurethane (PU) foam nanocomposites were formed via reaction of these polyol/water/Na-MMT mixtures with toluene diisocyanate (TDI). Forced-adiabatic attenuated total reflectance FTIR spectroscopy was used to determine the kinetics of both the PU copolymerisation and of the microphase separation between poly(ether-urethane) soft segments and polyurea hard segments. Consumption of TDI during the initial stages of the copolymerisation was accelerated significantly by the addition of ≤10 wt% Na-MMT. The initial rate of formation of urea groups also increased significantly upon addition of Na-MMT, but at reaction times >100 s a significant retardation occurred in the development of hydrogen bonding within the urea groups of the hard-segment phase that was recovered only after 1000 s. The reasons for this extensive disruption in structure development were investigated using flow microcalorimetry (FMC), diffuse reflectance Fourier-transform infrared spectroscopy (DRIFTS), and wide angle X-ray scattering (WAXS) to monitor the adsorption process and any chemical reaction between hydrated Na-MMT and a model monoisocyanate; 4-ethylphenyl isocyanate (4-EPI). DRIFTS spectra of 4-EPI adsorbed on Na-MMT revealed urea groups, indicating formation of N,N′-bis(4-ethylphenyl) urea. FMC indicated that a significant quantity of this urea formed at the surface and then desorbed. In addition, DRIFTS spectra indicated that the 4-EPI reacted with hydroxyl groups present at the edges of the silicate platelets to form urethane linkages. Thus, in a PU-foam reaction mixture, the water will tend to associate with the Na-MMT, either within the galleries or on the surfaces of silicate lamellae. Upon reaction with isocyanate, the presence of the Na-MMT both promotes the formation of urea and generates urethane linkages between silicate lamellae and the polyurethane. © 2010 VSP.