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Surface-activated rubber particles improve structural adhesives / Michael J. Gerace in ADHESIVES AGE, Vol. 38, N° 13 (12/1995)
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Titre : Surface-activated rubber particles improve structural adhesives Type de document : texte imprimé Auteurs : Michael J. Gerace, Auteur ; Janet M. Gerace, Auteur ; Mark A. Williams, Auteur Année de publication : 1995 Article en page(s) : p. 26-31 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs structuraux
Assemblages collés
Caoutchouc
Epoxydes
Formulation (Génie chimique)
Mouillage (chimie des surfaces)
Polyuréthanes
Résistance au cisaillementIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : Perhaps the most critical characteristic for an adhesive in its end use is the strength of the bond it forms. In practice, many factors can affect adhesive joint strength, including the internal strength of the adhesive, the ability of the adhesive to wet the substrate, the bond thickness, and the adhesive bonding area. The internal strength of the adhesive is often related to its modulus, which is a measure of the stiffness of the material. As a rule of thumb, both very high or very low modulus materials are undesirable as adhesives. A material with too high a modulus will tend to be brittle, causing the material to crack under stress. A low modulus material is often weak and tears easily.
Rubber can be used as a modulus modifier in many adhesives. This tough, flexible material resists both cracking and tearing. Because of its desirable elastomeric properties, rubber can be used to modify materials with unacceptable moduli. Unfortunately, rubbers are incompatible with many structural adhesives because many rubbers are nonpolar, and the ingredients in many structural adhesives are polar in nature.
The purpose of this paper is to introduce Vistamer rubber, a low-cost, surface-activated rubber particle that is readily incorporated into structural adhesive formulations. Vistamer rubber makes it possible to combine the elasticity and toughness of rubber with the desirable properties of polar structural adhesives. The following sections will explore some fundamentals of adhesion and demonstrate how moduli can affect adhesive properties. Then we will discuss Vistamer rubber and see how it has increased the adhesive strength of two structural adhesive systems, an epoxy and a polyurethane. Testing indicates that Vistamer rubber can be used as a "modulus modifier" that either reduces the modulus of a brittle adhesive or increases the modulus of a weak adhesive. The benefit to the formulator is a single, low-cost material that can improve the strength and flexibility of structural adhesives.Note de contenu : - FUNDAMENTALS OF ADHESION : Adhesives forces - Surface wetting - Adhesive joint - Adhesive modulus
- VISTAMER RUBBER
- VISTAMER RUBBER IN AN EPOXY ADHESIVE
- VISTAMER RIBBER IN A POLYURETHANE ADHESIVEEn ligne : https://drive.google.com/file/d/1vVKGivweoryDnW6SIjgAeDTOXzTwro05/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20799
in ADHESIVES AGE > Vol. 38, N° 13 (12/1995) . - p. 26-31[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001058 - Périodique Bibliothèque principale Documentaires Disponible Surface degradation and nanoparticle release of a commercial nanosilica/polyurethane coating under UV exposure / Deborah S. Jacobs in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)
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Titre : Surface degradation and nanoparticle release of a commercial nanosilica/polyurethane coating under UV exposure Type de document : texte imprimé Auteurs : Deborah S. Jacobs, Auteur ; Sin-Ru Huang, Auteur ; Yu-Lun Cheng, Auteur ; Savelas Rabb, Auteur ; Justin M. Gorham, Auteur ; Peter J. Krommenhoek, Auteur ; Lee L. Yu, Auteur ; Tinh Nguyen, Auteur ; Lipiin Sung, Auteur Année de publication : 2016 Article en page(s) : p. 735-751 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais accélérés (technologie)
Nanoparticules
Photodétérioration
Polyuréthanes
Revêtements -- Analyse:Peinture -- Analyse
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements -- Effets du rayonnement ultraviolet:Peinture -- Effets du rayonnement ultraviolet
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.Index. décimale : 667.9 Revêtements et enduits Résumé : Many coating properties such as mechanical, electrical, and ultraviolet (UV) resistance are greatly enhanced by the addition of nanoparticles, which can potentially increase the use of nanocoatings for many outdoor applications. However, because polymers used in all coatings are susceptible to degradation by weathering, nanoparticles in a coating may be brought to the surface and released into the environment during the life cycle of a nanocoating. Therefore, the goal of this study is to investigate the process and mechanism of surface degradation and potential particle release from a commercial nanosilica/polyurethane coating under accelerated UV exposure. Recent research at the National Institute of Standards and Technology (NIST) has shown that the matrix in an epoxy nanocomposite undergoes photodegradation during exposure to UV radiation, resulting in surface accumulation of nanoparticles and subsequent release from the composite. In this study, specimens of a commercial polyurethane (PU) coating, to which a 5 mass% surface-treated silica nanoparticle solution was added, were exposed to well-controlled, accelerated UV environments. The nanocoating surface morphological changes and surface accumulation of nanoparticles as a function of UV exposure were measured, along with chemical change and mass loss using a variety of techniques. Particles from the surface of the coating were collected using a simulated rain process developed at NIST, and the collected runoff specimens were measured using inductively coupled plasma optical emission spectroscopy to determine the amount of silicon released from the nanocoatings. The results demonstrated that the added silica nanoparticle solution decreased the photodegradation rate (i.e., stabilization) of the commercial PU nanocoating. Although the degradation was slower than the previous nanosilica epoxy model system, the degradation of the PU matrix resulted in accumulation of silica nanoparticles on the nanocoating surface and release to the environment by simulated rain. These experimental data are valuable for developing models to predict the long-term release of nanosilica from commercial PU nanocoatings used outdoors and, therefore, are essential for assessing the health and environmental risks during the service life of exterior PU nanocoatings. Note de contenu : - EXPERIMENTAL PROCEDURES : Sample preparation - UV exposure
- CHARACTERIZATION : Surface morphology and composition - Chemical degradation - Mass loss - Nanoparticle release
- RESULTS AND DISCUSSION : Surface morphology and composition - Chemical degradation - Mass loss - Nanoparticle release - Mechanism of nanoparticle release by UV exposureDOI : 10.1007/s11998-016-9796-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9796-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27107
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 735-751[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18316 - Périodique Bibliothèque principale Documentaires Disponible Surface properties of impregnated and varnished Scots pine wood after accelerated weathering / Ergun Baysal in COLORATION TECHNOLOGY, Vol. 130, N° 2 (04/2014)
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Titre : Surface properties of impregnated and varnished Scots pine wood after accelerated weathering Type de document : texte imprimé Auteurs : Ergun Baysal, Auteur ; Eylem Dizman Tomak, Auteur ; Musa Ozbey, Auteur ; Ebedin Altin, Auteur Année de publication : 2014 Article en page(s) : p. 140-146 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Conservation
Bois -- Effets du climat
Bois -- Revêtements protecteurs
Brillance (optique)
Colorimétrie
Dureté (matériaux)
Essais accélérés (technologie)
Pins et constituants
Polyuréthanes
Surfaces -- Analyse
VernisIndex. décimale : 667.3 Teinture et impression des tissus Résumé : In this study, the effect of accelerated weathering on the surface properties of Scots pine specimens impregnated with wolmanit-CB, tanalith-E, and adolit-KD5 and coated with synthetic and polyurethane varnishes was investigated by measuring surface hardness, glossiness, and colour. Results showed that weathering caused an increase in the hardness of impregnated and varnished specimens, while it caused a decrease in the glossiness of specimens. Surfaces became rougher and darker after weathering in comparison with the initial surfaces of wood specimens. Positive values of the chromatic coordinates indicated that the wood surfaces changed from their original colour to a reddish and yellowish colour. The highest colour change was detected in the specimens coated with polyurethane varnish alone. Both copper-based wood preservative treatment and varnish coating improved the surface properties of specimens in comparison with the surface properties observed on specimens coated with varnish alone. Note de contenu : - EXPERIMENTAL : Preparation of test specimens and wood preservative - Impregnation with wood preservatives - Coating of the wood surfaced - Accelerated weathering test - Surface hardness measurements - Glossiness measurements - Colour measurements - Statistical test
- RESULTS AND DISCUSSION : Surface hardness - Glossiness - Colour changesDOI : 10.1111/cote.12070 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12070 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20870
in COLORATION TECHNOLOGY > Vol. 130, N° 2 (04/2014) . - p. 140-146[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16129 - Périodique Bibliothèque principale Documentaires Disponible Surface tension studies in colloidal unimolecular polymers / Ashish Zore in COATINGS TECH, Vol. 18, N° 2 (02/2021)
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Titre : Surface tension studies in colloidal unimolecular polymers Type de document : texte imprimé Auteurs : Ashish Zore, Auteur ; Michael van de Mark, Auteur Année de publication : 2021 Article en page(s) : p. 24-31 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages polymères -- propriétés mécaniques
Caractérisation
Granulométrie
Latex
Poids moléculaires
Polycarboxylates
Polymères -- Synthèse
Polymères unimoléculaires colloïdaux
Polysulfones
Polyuréthanes
Tension superficielleIndex. décimale : 668.9 Polymères Résumé : Colloidal unimolecular polymer particles, or CUPs, are true nanoscale charged particles of size less than 10 nm that are made by a simple method that allows for preparation of additive-free, zero-volatile organic content (VOC) and stable dispersions. These CUP particles are made from a single polymer chain containing a well-balanced number of hydrophobic and hydrophilic units (Figure 1). The polymer chain is transformed into a CUP particle because the polymer-polymer interaction exceeds polymer-solvent interaction during the addition of water to the polymer in dilute solution in a low-boiling, water-loving solvent, resulting in collapse of the chain to form a particle.
This process is like formation of micelles, or the water reduction process in water-reducible coatings.1 The charged groups on the surface of the particles provide stability and prevent aggregation due to ionic repulsion. The CUP suspension is free of any additives or surfactants as it contains only charged particles, water, and counterions. Due to the process simplicity, it is easy to control the particle size, charge density on the surface, and composition of these particles.2 CUP particles can also be a good model material for study of protein due to similarities in their size. They can also have potential applications in the field of coatings, drug delivery, catalyst matrix, etc.
CUPs have a great potential in the field of coatings as demonstrated in several publications by Van De Mark et.al. They can be used as coating resin in conjunction with latex and polyurethane dispersions (PUDs) and can be cured with an aziridine3 or a melamine crosslinker4. CUPs with sulfonic acids as the charged stabilizing group can be used as a catalyst for waterborne curing such as acrylic-melamine systems.5 CUPs with amine functional groups CUPs with amine functional groups have been synthesized and used as a crosslinker for waterborne epoxy coatings.6 The CUP particles are hydrated with a layer of water around them, often referred to as surface or bound water, which is non-freezable.Note de contenu : - EXPERIMENTAL : Synthesis of polymer and water reduction - Characterization
- RESULTS AND DISCUSSION : Characterization of polymers - Particle size analysis - Equilibrium surface tension behavior
- Fig. 1 : Formation of CUPs
- Fig. 2 : Surface tension vs concentration behavior for PUD1, PUD2 (solid triangles) and PUD2 diluted to different concentration using 12.9% NMP-water mixture instead of water - Dynamic surface tension behavior
- Fig. 3 : Surface tension vs concentration behavior for polymer 2 (CUPs), PUD1 and latex
- Fig. 4 : Equilibrium surface tension of the carboxylate CUPs (polymers 1 and 2), sulfonate CUPs (polymer), and QUAT-CUPs (polymer 4)
- Fig. 5 : Dynamic surface tension behavior of the latex, PUD1, and CUPs at different surface ages at 3% solids
- Fig. 6 : Dynamic surface tension behavior of the carboxylate (polymer 2), sulfonate (polymer3), and QUAT (polymer 4) CUPs at different surface ages
- Table 1 : Acid number, densities, and molecular weights of the copolymers
- Table 2 : Molecular weights and particle size of the CUPs
- Table 3 : Fitting parameters for dynamic surface tension vs surface age at 0.5 mol/m3 and diffusion coefficient (Dc) at 25°CEn ligne : https://drive.google.com/file/d/1Z_Mny6LNFkOkYOVQS4cTyTGyEAqVV8xm/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35256
in COATINGS TECH > Vol. 18, N° 2 (02/2021) . - p. 24-31[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22581 - Périodique Bibliothèque principale Documentaires Disponible Surface topography and tribological properties of coatings prepared from microparticle size polyurethane dispersions studied by atomic force microscopy / Qi Chen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)
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Titre : Surface topography and tribological properties of coatings prepared from microparticle size polyurethane dispersions studied by atomic force microscopy Type de document : texte imprimé Auteurs : Qi Chen, Auteur ; Roel Swaans, Auteur ; Paul de kok, Auteur ; Michael Villet, Auteur ; Yansen Lauw, Auteur ; Matthew Gebhard, Auteur Année de publication : 2018 Article en page(s) : p. 713-719 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dispersions et suspensions
Microscopie à force atomique
Milieux dispersés
Polymères en émulsion
Polyuréthanes
Revêtements
Topographie
Tribologie (technologie)Index. décimale : 667.9 Revêtements et enduits Résumé : The surface topography and mechanical properties of coatings prepared using large particle size polyurethane dispersions (PUD) are investigated using atomic force microscopy (AFM) imaging, AFM-based force measurements, and friction force microscopy. PUD coatings, which are prepared from dispersions containing particles of micron size, have surface roughness of 250–300 nm and waviness of 2.5–3 μm resulting from the particle size. The surface moduli of the PUD coatings are varied by tuning the ratio of hard-to-soft segmentation in the polyurethanes and are found to be between 40 and 100 MPa. The friction coefficient obtained in the study is found to be correlated with both the surface modulus of the coatings and the adhesion between the probe and the samples and is well in line with the perceived feel of an experienced human panel. The data are very well behaved and clearly show the utility of this technique in characterizing these types of surfaces. Note de contenu : - PUD coatings
- AFM imaging and force measurements
- Friction force microscopyDOI : 10.1007/s11998-018-0067-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0067-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30849
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 4 (07/2018) . - p. 713-719[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20078 - Périodique Bibliothèque principale Documentaires Disponible Surfaces that help healing / Chris Koppenborg in KUNSTSTOFFE INTERNATIONAL, Vol. 101, N° 5 (05/2011)
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PermalinkSustainability at every turn / Andreas Chrisochoou in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 8 (2022)
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PermalinkSustainable and environmentally friendly technologies for the automotive sector / Ellen C. Lee in JEC COMPOSITES MAGAZINE, N° 71 (03/2012)
PermalinkSustainable and invisible anti-counterfeiting inks based on waterborne polyurethane and upconversion nanoparticles for leather products / Jun Xiang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
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PermalinkPermalinkSustainable, low-emissions, high-performance polyols for wood floor coatings / Gary Spilman in COATINGS TECH, Vol. 15, N° 10 (10/2018)
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PermalinkPermalinkSustainable polyurethanes are here to stay / Wolfgang Geuking in EUROPEAN COATINGS JOURNAL (ECJ), N° 4 (04/2021)
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PermalinkPermalinkSustainable way of walking / Thomas Michaelis in KUNSTSTOFFE INTERNATIONAL, Vol. 102, N° 1 (01/2012)
PermalinkSustaining resources / Markus Dimmers in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 197, N° 4515 (08/2007)
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PermalinkSynergistic effects in thermoplastic polyurethanes incorporating hybrid carbon nanofillers / D. Yuan in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 5 (11/2016)
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PermalinkSynthèse et caractérisation de nanoparticules polyuréthane réticulées en solution dans divers milieux de polarité ajustable - Applications potentielles des nanogels / Lionel Picard / 2008
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PermalinkSynthèse et formulation d'un vernis polyuréthane bactéricide / Nadège Destais-Orvoën in L'ACTUALITE CHIMIQUE, N° 6 (06/2003)
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PermalinkSynthèse de polyuréthanes à partir d'huiles végétales fonctionnalisées par la réaction thiol-ène in MATERIAUX & TECHNIQUES, Vol. 100, N° 5 (2012)
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