Amorphous low molecular weight aromatic compounds possessing no weight loss behavior in fluoroalkyl end-capped vinyltrimethoxysilane oligomeric silica/hexagonal boron nitride nanocomposites even after calcination at 800°C / Jittraporn Saengkaew in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 4 (07/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 4 (07/2020) . - p. 1053-1064 Titre : Amorphous low molecular weight aromatic compounds possessing no weight loss behavior in fluoroalkyl end-capped vinyltrimethoxysilane oligomeric silica/hexagonal boron nitride nanocomposites even after calcination at 800°C Type de document : texte imprimé Auteurs : Jittraporn Saengkaew, Auteur ; Takahumi Ogasawara, Auteur ; Katsumi Yamashita, Auteur ; Suwadee Kongparakul, Auteur ; Masakazu Nishida, Auteur ; Hideo Sawada, Auteur Année de publication : 2020 Article en page(s) : p. 1053-1064 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale Composés organiques Diffractométrie de rayons X Fluoropolymères Matériaux amorphes Matériaux hybrides Nitrure de bore Le nitrure de bore est un composé chimique du bore et de l'azote, de formule chimique brute BN (nombre égal d'atomes de chaque élément). Le nitrure de bore est isoélectronique avec le carbone et, comme ce dernier, existe sous plusieurs formes polymorphiques, dont l'une est analogue au diamant et l'autre au graphite. La forme diamant est l'un des matériaux les plus durs connus et la forme graphite est un lubrifiant apprécié. De plus, ces deux polymorphes possèdent des propriétés d'absorption radar. Oligomères Résonance magnétique nucléaire Sol-gel, Procédé Stabilité thermique Vinyltriméthoxysilane Index. décimale : 667.9 Revêtements et enduits Résumé : Fluoroalkyl end-capped vinyltrimethoxysilane oligomer [RF-(CH2CHSi(OMe)3)n-RF ; n = 2, 3; RF = CF(CF3)OC3F7] undergoes the sol–gel reactions in the presence of hexagonal boron nitride (h-BN) nanoparticles and low molecular weight aromatic compounds (ArHs) such as bisphenol AF (BPAF) and 1-(2-naphthyl)ethanol (Naph-EtOH) under alkaline conditions at room temperature to afford the corresponding fluorinated oligomeric silica/h-BN/ArHs nanocomposites [RF-(VM-SiO3/2)n-RF/h-BN/ArHs]. TG–DTA analyses and XRD spectra measurements show that the encapsulated ArHs in the fluorinated oligomeric silica/h-BN nanocomposites exhibit an amorphous structure, affording no weight loss corresponding to the contents of the ArHs in the nanocomposites even after calcination at 800°C, although the simple blend hybrids of the RF-(VM-SiO3/2)n-RF/h-BN nanocomposites and the original ArHs provide not only the crystal characteristic toward the ArHs but also a clear weight loss behavior in proportion to the contents of the ArHs in the blend hybrids after calcination at 800°C. 1H MAS NMR spectra, UV–Vis spectra, and fluorescent spectra of the RF-(VM-SiO2)n-RF/h-BN/ArHs nanocomposites obtained through the sol–gel reactions under alkaline conditions showed the presence of the ArHs in the nanocomposites, respectively. Note de contenu : - Measurements - Materials - Preparation of fluoroalkyl end-capped vinyltrimethoxysilane oligomeric silica/hexagonal boron nitride/PBAF nanocomposites [RF-(VM-SiO3/2)n-RF/h-BN/BPAF] - Preparation of simple blend hybrids of the RF-(VM-SiO3/2)n-RF/h-BN nanocomposites and original BPAF - FTIR spectra measurements of the RF-(VM-SiO3/2)n-RF/h-BN/Naph-EtOH nanocomposites DOI : https://doi.org/10.1007/s11998-020-00331-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00331-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34392 [article]

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Effect of hot water and water-carrying agent on the properties of silane-water crosslinked linear low density polyethylene / T. Chen in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 2 (05/2013) . - p. 180-187 Titre : Effect of hot water and water-carrying agent on the properties of silane-water crosslinked linear low density polyethylene Type de document : texte imprimé Auteurs : T. Chen ; J. Wang ; P. Shi ; Q. Li ; C. Wu Année de publication : 2013 Article en page(s) : p. 180-187 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alun Eau Peroxyde de dicumyle Polyéthylène basse densité linéaire Polymères -- Propriétés mécaniques Polymères -- Propriétés thermiques Réticulation (polymérisation) Vinyltriméthoxysilane Index. décimale : 668.9 Polymères Résumé : The influence of hot water and the water-carrying agent aluminum potassium sulfate dodecahydrate (alum) on the mechanical and thermal properties of the silane-water crosslinked linear low density polyethylene (LLDPE) was investigated. LLDPE was melt-grafted with various content of vinyl trimethoxysilane (VTMS) using dicumyl peroxide (DCP) as initiator. The results show that the contribution of hot water to gel content is poor, about 2 to 16 %, compared with that of the silane grafted LLDPE. Is feasible to achieve silane-water crosslinking reaction with alum for self-crosslinked LLDPE; furthermore, the self-crosslinked LLDPE has lower crosslink density (m). It was found that alum could not only conduct silane-water crosslinking reaction effectively, but also improve the mechanical properties, especially the elongation behavior. The heat of fusion (DHm), the melting temperature (Tm), and the degree of crystallinity (Xc) of the hot water crosslinked LLDPE decreased with the advancement of VTMS. The Avrami exponent n of self-crosslinked sample was larger than that of hot water crosslinked sample. This means that the alum could contribute to the growth of crystallization. Note de contenu : - EXPERIMENTAL : Materials - Silane grafting and water crosslinking of LLDPE - Characterizations - RESULTS AND DISCUSSION : Grafting analysis - Gel content and crosslink density - Mechanical properties - Thermal properties DOI : 10.3139/217.2672 En ligne : https://drive.google.com/file/d/1OG_KmaUmczdSdbQK-aFwHggZaKVHpuB8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18428 [article]

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Preparation and applications of two fluoroalkyl end-capped vinyltrimethoxysilane oligomeric composites possessing superoleophilic/superhydrophobic characteristic : a review / Hideo Sawada in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 741-756 Titre : Preparation and applications of two fluoroalkyl end-capped vinyltrimethoxysilane oligomeric composites possessing superoleophilic/superhydrophobic characteristic : a review Type de document : texte imprimé Auteurs : Hideo Sawada, Auteur Année de publication : 2022 Article en page(s) : p. 741-756 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composés aromatiques Composés fluorés Fluoropolymères Hydrophobie Oléophilie Oligomères Séparation huile/eau Substances dangereuses -- Elimination Vinyltriméthoxysilane Index. décimale : 667.9 Revêtements et enduits Résumé : Two fluoroalkyl end-capped vinyltrimethoxysilane oligomers [RF-(CH2CHSi(OMe)3)n-RF; RF = fluoroalkyl group] can be synthesized by reaction of fluoroalkanoyl peroxides [RF-C(=O)O-O(O=)C-RF] with vinyltrimethoxysilane under mild conditions. Fluorinated oligomers thus obtained have been applied to the sol-gel reactions in the presence of a wide range of guest molecules (Guest) under non-catalytic, alkaline or acidic conditions to provide the corresponding fluorinated oligomers/Guest composites. Some of these fluorinated composites were found to exhibit a uperoleophilic/superhydrophobic characteristic on their surface, applying to not only the separation of oil and water but also the selective removal of fluorinated aromatic compounds in aqueous solutions. These findings will be reviewed in this article. Note de contenu : - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/PSt and /PTFE composites - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomeric composites containing gluconamide unit - Preparation and properties of fluoroalkyl end-capped oligomeric cellulose derivatives composites - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/alkyl-modified cellulose derivatives composites - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/cellulose fiber composites - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/cellulose nanofiber composites - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/micro-sized silica gel composite - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/cyclodextrin composites - Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/magnetite composites DOI : https://doi.org/10.1007/s11998-021-00598-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00598-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38069 [article]

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Preparation of amphiphobically modified poly(vinyl alcohol) film by fluoroalkyl end-capped vinyltrimethoxysilane oligomer / Yuta Aomi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 3 (05/2019) . - p. 651-660 Titre : Preparation of amphiphobically modified poly(vinyl alcohol) film by fluoroalkyl end-capped vinyltrimethoxysilane oligomer Type de document : texte imprimé Auteurs : Yuta Aomi, Auteur ; Hideo Sawada, Auteur Année de publication : 2019 Article en page(s) : p. 651-660 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool polyvinylique Amphiphobie Diffractométrie de rayons X Fluoropolymères Oligomères Résistance à l'humidité:Résistance à l'eau Revêtements organiques Stabilité thermique Vinyltriméthoxysilane Index. décimale : 667.9 Revêtements et enduits Résumé : Hydrophilic poly(vinyl alcohol) (PVA) was chemically modified by using fluoroalkyl end-capped vinyltrimethoxysilane oligomer [RF-(VM)n-RF] to lead the PVA/RF-(VM)n-RF composite films. The PVA/RF-(VM)n-RF composite film obtained under non-catalytic conditions was found to provide the water-soluble property; however, the acidic conditions enabled the composite film to afford no solubility toward water, giving an amphiphobic property on both the surface and reverse sides just after the deposit of an oil or water droplet. RF-(VM)n-RF oligomer was also applied to the fabrication of the PVA/RF-(VM)n-RF/B(OH)3 composite film by using the RF-(VM)n-RF/B(OH)3 nanocomposites, which were prepared by the composite reaction of RF-(VM)n-RF oligomer with boric acid. It was demonstrated that the PVA/RF-(VM)n-RF/B(OH)3 composite film obtained by the interaction of the corresponding nanocomposites with PVA under acidic conditions can afford the perfect water-resistance ability even after immersion of this film into water for 30 min to give the amphiphobic property on both the surface and reverse sides, although the corresponding PVA/RF-(VM)n-RF composite film and the pristine PVA film provided the swelling behavior toward water, respectively. Thermal gravimetric analyses (TGA) and differential thermal analyses (DTA) measurements showed that the PVA/RF-(VM)n-RF/B(OH)3 composite film can give a higher thermal stability than that of the RF-(VM)n-RF/PVA composite film and the pristine PVA film. DOI : 10.1007/s11998-018-0148-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0148-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32579 [article]

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Synthesis of silicone-acrylic-modified high-ortho novolac resin with enhanced thermal resistance and surface coating properties / Serkan Emik in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 6 (11/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 6 (11/2021) . - p. 1679-1690 Titre : Synthesis of silicone-acrylic-modified high-ortho novolac resin with enhanced thermal resistance and surface coating properties Type de document : texte imprimé Auteurs : Serkan Emik, Auteur ; Tülin Banu Iyim, Auteur ; Saadet özgümüs, Auteur Année de publication : 2021 Article en page(s) : p. 1679-1690 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Caractérisation Polymères -- Synthèse Résistance à l'humidité:Résistance à l'eau Revêtements -- Propriétés chimiques Revêtements -- Propriétés physiques Revêtements -- Propriétés thermiques Revêtements organiques Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Vinyltriméthoxysilane Index. décimale : 667.9 Revêtements et enduits Résumé : In the present study, vinyltrimethoxysilane was used to modify high-ortho novolac resin (NR) to obtain a vinyl silicone-modified phenolic oligomer (Si-mod NR). Subsequently, this oligomer is polymerized with methyl methacrylate. The mid-products (NR and Si-mod NR) and synthesized silicone-modified phenolic/acrylic resin (Ac/Si-mod NR) were characterized by Fourier transform infrared spectroscopy, and thermal properties were investigated by using thermal gravimetric analysis and differential scanning calorimetry techniques. In addition, the surface coating properties, including drying, hardness, adhesion, impact resistance, gloss, acid, alkaline, water, and solvent resistance of the films prepared from these products, were comparatively investigated. The results showed that the modification reactions yield a novel resin (Ac/Si-mod NR), which can be easily used as a surface coating material with high thermal resistance, flexibility, and excellent film properties. Note de contenu : - EXPERIMENTAL : Material and instruments - Synthesis of high-ortho novolac resin (NR) - Synthesis of silane and vinyl-modified novolac intermediate (Si-mod NR) - Polymerization of Si-mod NR intermediate with the acrylic monomer (Ac/Si-mod NR) - Film preparation - Characterization of surface coating properties - RESULTS AND DISCUSSION : Synthesis and characterization studies - Film properties of the products - - Table 1 : The list of surface coating test standards - Table 2 : Specific weight loss temperatures and the char yields of the products - Table 3 : Film properties of the products (drying, adhesion, hardness, impact resistance, and gloss) - Table 4 : Water resistance properties of the films - Table 5 : Alkaline resistance properties of the films - Table 6 : Acid resistance properties of the films - Table 7 Solvent resistance properties of the films DOI : https://doi.org/10.1007/s11998-021-00527-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00527-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36825 [article]

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