Hydroxyl-terminated polybutadiene liquid resins for adhesives applications / Taejun Yoo in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 24, N° 1 (01/2017)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 24, N° 1 (01/2017) Titre : Hydroxyl-terminated polybutadiene liquid resins for adhesives applications : Hydroxyl-terminated polybutadiene resin-based polyurethane elastomers offer solutions to strenuous applications in the sealants and adhesives market Type de document : texte imprimé Auteurs : Taejun Yoo, Auteur ; Herbert Chao, Auteur Année de publication : 2017 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs dans les équipements électriques/électroniques Colles:Adhésifs Contraintes thermiques Elastomères Encapsulation Formulation (Génie chimique) Hydrostabilité Joints d'étanchéité Mastics Polybutylène téréphtalate Polymères à terminaison hydroxyle Polyuréthanes Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Hydroxyl-terminated polybutadiene (HTPB) resins occupy a unique space within the landscape of commercially available polyols in the context of polyurethane elastomers. Characterized by low temperature flexibility, hydrophobicity and hydrolytic stability, polyurethane elastomers present solutions to strenuous applications in the adhesives and sealants market. Due to the hydrocarbon nature of the polymer backbone, these elastomers also have extremely low dielectric constant, dissipation factor, and moisture vapor transmission rate (MVTR) properties. With the fast growth of the information industry, electronic products such as mobile phones, personal digital assistants and notebooks have become daily necessities for many of us. Multifunctional urethane (meth)acrylates derived from hydrogenated HTPB resins, which have excellent properties against oxidation and a relatively high refractive index of about 1.5, have gradually established their use as essential ingredients in UV-cured compositions in a clear optical index-matched adhesive for the bonding of two or more optical components together. Note de contenu : - Encapsulants - Hydrolytic Stability - Thermal shock/embedment stress - Low exotherm and minimal shrinkage - Liquid optically clear adhesive - Ideal ingredients - FIGURES : 1. Chemical modification of HTPB - 2. MVTR of encapsulation resins - 3. Schematic diagram of IGU TABLES : 1. Differences between anionically and radically of polymerized HTPB resins - 2. Series A resin system for encapsulant - 3. Starting point formulation using series A resin R-45HTLO as the base resin for an insulating glass window sealant En ligne : http://www.adhesivesmag.com/articles/95157-hydroxyl-terminated-polybutadiene-liq [...] Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28763 [article]

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Improved durability through reactive dispersant technology / Steffen Onclin in COATINGS TECH, Vol. 15, N° 7 (07/2018)  

[article]  inCOATINGS TECH > Vol. 15, N° 7 (07/2018) . - p. 22-33 Titre : Improved durability through reactive dispersant technology Type de document : texte imprimé Auteurs : Steffen Onclin, Auteur ; Kou Huiguang, Auteur ; Rainer Diehl ; Elena Martinez ; Clemens Auschra ; Andrew Recker ; Anthony Moy Année de publication : 2018 Article en page(s) : p. 22-33 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents dispersants (chimie) Copolymère acrylique mélamine Copolymères séquencés Essai de dureté Essais dynamiques Granulométrie Noir de carbone Pâte pigmentaire Pigments Polymères à terminaison hydroxyle Polyuréthanes Revêtements -- Additifs:Peinture -- Additifs Rhéologie Vernis bi-composant Vernis en phase aqueuse Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Even though formulation additives comprise only a minor part of a coating formulation, they can have pronounced effects on the physical properties of the final coating. This is especially true for pigment dispersants, which can enter a coating formulation “under the radar” through, for example, pigment pastes.  As dispersants are often polar polymers with a low glass transition temperature, the interface between the pigment and continuous phase forms a weak point, especially in coatings designed for high durability. This article addresses the development of an improved dispersant technology. The dispersants are functionalized such that they become part of the continuous phase of the coating, improving overall film integrity. Application examples, in both waterborne and solventborne formulations, demonstrate the effects of reactive technology on mechanical and barrier properties in comparison to conventional systems. Note de contenu : - Effect of dispersants on coatings properties - Dispersant with new anchoring chemistry - Reducing negative impact of dispersants on coating properties - Towards waterborne reactive dispersants - Fig. 1 : Stabilization mechanisms of dispersants - Fig. 2 : Effect of exchanging part of grinding resin with dedicated dispersant (internal BM 1) on pigment paste rheology and transparecy in a solventborne MS OEM system. Values in brackets reflect dispersant dosage (active dispersant on pigment) - Fig. 3 : Pendulum hardness and MEK-rub test results of a solventborne MS-OEM basecoat after the addition of 20% pigment paste. Values in brackets reflect dispersant dosage (active dispersant on pigment). MEK-rubs were performed directly on the basecoat - Fig. 4 : Mill base viscosities, fresh and after two weeks at 50°C, as a function of dispersant dosage. Pigment pastes are resin-free and contain 13% carbon-black - Fig. 5 : Average particle size of pigment pastes as function of dispersant dosage. Particle size measurements were performed two days after pigment paste preparation - Fig. 6 : Schematic representation of working principle of analytical ultra-centrifuge - Fig. 7 : Dispersant adsorption in a solventborne, resin-free carbon black pigment paste, measured with an anlytical ultra-centrifuge. Effective (measured) dispersant on pigment is plotted againsf formulated dispersant on pigment - Fig. 8 : Jetness and undertone values in a medium-solids OEM basecoat. Coatings were applied on a glass substrate and measurements wre taker from the backside (through the glass) to reduce surface effects - Fig. 9 : Jetness and undertone values in a 2KPU topcoat. Coatings were applied on a glass substrate and measurements were taken from the backside (though the glass) to reduce surface effects - Fig. 10 : Schematic representation of co-reactive dispersant concept. The dispersant becomes part of the continuous resin phase to improve film integrity - Fig. 11 : Pendulum hardness and MEK-rub resistance of an MS-OEM basecoat. The MEK-rub test was performed directly on the basecoat - Fig. 12 : Pendulum hardness and chemical resistance of a 2KPU topcoat, containing 20% pigment paste. Chemical resistance after 16h exposure. Chemical resistance rating : 5 = no change, 1 = strong change/damage - Fig. 13 : Functionalization of block copolymer dispersants with hydroxyl-functional groups - Fig. 14 : Pigment paste rheology (fresh) of resin-free pigment concentrates containing 18% PBk 7 and a DOP level of 100%. Jetness and undertone in a WB 1K acrylic melamine topcoat, applied on glass, after mixing with 20% pigment paste. Measurements were taken from the backside (though the glass) - Fig. 15 : Pendulum hardness of WB 1K acrylic melamine topcoat containing 20% of carbon black pigment paste - Fig. 16 : Chemical resistance of a 1k acrylic melamine topcoat, containing 20% pigment paste. Data after 16h exposure. Chemical resistance rating : 5 = no change, 1 = strong change/damage En ligne : https://drive.google.com/file/d/1CDNJI6SBFF_mE-AMpYjliE_s5klSpHDp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31209 [article]

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A novel hydroxyl polyacrylate latex modified by OvPOSS and its application in two-component waterborne polyurethane coatings / Wu Zeng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 1 (01/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 1 (01/2020) . - p. 181-191 Titre : A novel hydroxyl polyacrylate latex modified by OvPOSS and its application in two-component waterborne polyurethane coatings Type de document : texte imprimé Auteurs : Wu Zeng, Auteur ; Haowei Huang, Auteur ; Liujun Song, Auteur ; Xiang Jiang, Auteur ; Xinya Zhang, Auteur Année de publication : 2020 Article en page(s) : p. 181-191 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Composés organiques -- Synthèse Copolymérisation Essai de dureté Essai Wolff-Wilborn Polyacrylates Polymères à terminaison hydroxyle Polyuréthanes Revêtements -- Propriétés thermiques Revêtements bi-composant Revêtements organiques Silsesquioxanes oligomères polyhèdres Index. décimale : 667.9 Revêtements et enduits Résumé : Octavinyl polyhedral oligomeric silsesquioxane (OvPOSS) was synthesized via hydrolysis and condensation of vinyltriethoxysilane. The structure of OvPOSS was determined by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), 1H nuclear magnetic resonance and 29Si nuclear magnetic resonance. A novel hydroxyl functional polyacrylate latex (HPA) with core–shell structure modified by OvPOSS (OvPOSS/HPA) was successfully prepared via emulsion copolymerization. Consequently two-component waterborne polyurethane (2K-WPU) coatings were prepared by using the as-prepared latex as hydroxyl components and hydrophilic polyisocyanates as curing agents. The structure and properties of OvPOSS/HPA were marked by FTIR, XRD, differential scanning calorimetry and thermogravimetric analysis. The results of FTIR and XRD show that OvPOSS has been successfully embedded into HPA, and OvPOSS occupies a homogeneous distribution in the HPA matrix. The effect of OvPOSS on the properties of OvPOSS/HPA as well as the application performance of 2K-WPU coatings film were also investigated. The results show that OvPOSS/HPA possesses core–shell structure with the OvPOSS core and enhanced thermal stability. The glass transition temperature (Tg) of OvPOSS/HPA with 2.0% OvPOSS content is 22.3°C, which is 8.4°C higher than that of pure HPA. The performance properties of the 2K-WPU coating films such as pencil hardness were also improved by incorporation of OvPOSS. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of octavinyl-POSS (Ov POSS) - Synthesis of OvPOSS/HPA - Preparation of 2K-WPU coatings - Characterizations and instruments - RESULTS AND DISCUSSION : Structure characterization of OvPOSS - Structure characterization of OvPOSS/HPA - Particle size distribution of OvPOSS/HPA - Thermal properties of OvPOSS/HPA films DOI : 10.1007/s11998-019-00256-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00256-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33737 [article]

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Preparation and properties of hybrid epoxy/hydro-terminated polybutadiene/modified MMT nanocomposites / Hongling Yi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1413-1422 Titre : Preparation and properties of hybrid epoxy/hydro-terminated polybutadiene/modified MMT nanocomposites Type de document : texte imprimé Auteurs : Hongling Yi, Auteur ; Ting Wei, Auteur ; Heng Lin ; Junjie Zhou Année de publication : 2018 Article en page(s) : p. 1413-1422 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites -- Propriétés mécaniques Epoxydes Montmorillonite Nanostructures Polybutadiène Polymères à terminaison hydroxyle Rupture (mécanique) Index. décimale : 667.9 Revêtements et enduits Résumé : The effects of hydroxyl-terminated polybutadiene (HTPB) number average molecular weight ( \overline{{\boldsymbol{M\fancyscript{n}}}} ) and preparation temperature on montmorillonite (MMT) intercalation/exfoliation behavior were investigated. X-ray diffraction and Fourier transform infrared spectroscopy results indicated that 40 to 80°C were the preferred temperatures to obtain nanostructured HTPB/MMT. The higher \overline{{\boldsymbol{M\fancyscript{n}}}} (> 2800) of HTPB led to a more exfoliated nanostructure than lower \overline{{\boldsymbol{M\fancyscript{n}}}} as proven by transmission electron microscopy. The tensile strength, tensile modulus, and elongation at break of nanostructured HTPB/MMT/EP ternary composites were higher than those of the HTPB/EP binary blend, which was due to the HTPB/MMT hybrid structure. The effect of increasing molecular weight on impact strength in the ternary system was less than that in the binary system. The HTPB/MMT/epoxy hybrid composites with low concentration could improve the impact strength, which was due to the superposition effect of organic/inorganic nanostructures. In hybrid HTPB/MMT/epoxy composite system, the toughening was attributed to the slow crack growth and fast crack growth, and the dissipated energy of pulling or debonding nanoclay out from the matrix also contributed. Note de contenu : - EXPERIMENTAL WORK : Materials - Preparation of HTPB/MMT composites - Preparation of HTPB-EP binary blend and HTPB/MMT/EP ternary composites - Analysis and characterization - RESULTS AND DISCUSSION : Preparation of nanostructured MMT/HTPB - The mechanical properties of EP composites - Fracture morphology and failure mechanisms DOI : 10.1007/s11998-018-0093-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0093-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31362 [article]

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Preparation of novel organo-montmorillonite and its influence on the acid resistance of hybrid cathodic electrodeposition polyurethane coating / Zijian Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 597-605 Titre : Preparation of novel organo-montmorillonite and its influence on the acid resistance of hybrid cathodic electrodeposition polyurethane coating Type de document : texte imprimé Auteurs : Zijian Li, Auteur ; Cuiping Li, Auteur ; Dongxin Li, Auteur ; Yuxiang Jiang, Auteur ; Zaifeng Li, Auteur Année de publication : 2019 Article en page(s) : p. 597-605 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Electrophorèse Matériaux hybrides Montmorillonite Polymères à terminaison hydroxyle Polyuréthanes Pulvérisation cathodique Résistance chimique Revêtements:Peinture Silice La 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 : Based on the super-composite effect of clay minerals consisting of silicate layers on the polymer, nano-hybrid organic–inorganic composites have attracted great interest. In this paper, a novel organoclay with reactive hydroxyl group was prepared by incorporation into a hydroxyl-terminated cationic polyurethane oligomer (HTCPU) via interlamination. Sodium montmorillonite was organically modified with HTCPU oligomers in the water medium. The modified organo-montmorillonite was characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction, and thermogravimetric analysis. After sequential poly-addition reactions, the hydroxyl-terminated polyurethane hybrid resins with nano-silica layers were prepared and then the resin mixed with blocked hexamethylene diisocyanate trimer (crosslinking agent) in advance and then was emulsified with deionized water to produce the nano-hybrid electrophoresis coating. A series of PU films were prepared by the electrophoresis process. The optimized baking temperature was determined by in situ FTIR, and the effect of the organo-montmorillonite content on the acid resistance of film was studied. When the mass fraction of organo-montmorillonite was about 0.35%, the PU film showed the best acid resistance. It was found that the desirable appearance and properties could be obtained by a prebake of a temperature of 80°C to remove water in the wet film to avoid the pinholes in the paint film for 20 min, followed by a baking temperature of 135°C for 60 min. Note de contenu : - EXPERIMENTAL : Materials - Preparation of water-dispersed hydroxyl-terminated cationic polyurethand oligomers - Preparation of novel OMMT with reactive hydroxyl group - Preparatioin of nano-clay hybrid electrophoresis resins - Preparation of electrodeposited PU films - CHARACTERIZATION FTIR spectroscopy - X-ray diffraction - Thermogravimetric analysis - In situ FTIR analysis - Transmission electron microscopy - Acid resistance - RESULTS AND DISCUSSION : Characterization of novel OMMT DOI : 10.1007/s11998-018-0141-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0141-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32428 [article]

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Synthesis and properties of hydroxyl-terminated hyperbranched poly isocyanurate-ester retanning agents / Ren Long-Fang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 7 (07/2017)  

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