Can PE gas pipes also be bonded ? in ADHESION - ADHESIVES + SEALANTS, N° 3/2015 (2015)  

[article]  inADHESION - ADHESIVES + SEALANTS > N° 3/2015 (2015) . - p. 32-33 Titre : Can PE gas pipes also be bonded ? Type de document : texte imprimé Année de publication : 2015 Article en page(s) : p. 32-33 Langues : Multilingue (mul) Catégories : Assemblages collés Polyacrylate de méthyle Polyéthylène Tuyaux de gaz Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Bonding instead of welding - A research team conducted extensive experiments with adhesives of various manufacturers. They wanted to find out if the bonding of gas pipes made of polyethylene is possible. En ligne : https://drive.google.com/file/d/1MdFLEvLXNkjDPaE-iNPqkcG01IXljbTg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24829 [article]

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Methyl acrylate polymers as suitable materials for the conservation of stone : performance improvements through atom transfer radical polymerization / Barbara Sacchi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 5 (09/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 5 (09/2013) . - p. 649-657 Titre : Methyl acrylate polymers as suitable materials for the conservation of stone : performance improvements through atom transfer radical polymerization Type de document : texte imprimé Auteurs : Barbara Sacchi, Auteur ; Laura Giannini, Auteur ; Marco Frediani, Auteur ; Luca Rosi, Auteur ; Piero Frediani, Auteur Année de publication : 2013 Article en page(s) : p. 649-657 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymérisation Fluoropolymères Polyacrylate de méthyle Polymérisation radicalaire par transfert d'atome Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Acrylic polymers are a suitable category of materials for application in building stone conservation mainly due to their peculiarities (i.e., easy to apply, low cost, good adhesive and cohesive properties, and high solubility in many organic solvents). The performances of polyacrylates have been improved through atom transfer radical polymerization (ATRP). Polymers were obtained with low polydispersity, controlled molecular weight, and showing better stability to UV irradiation than products obtained by radical polymerization. New poly(methyl acrylate-co-perfluoropolyethers) were also prepared via ATRP, using a perfluoropolyether derivative as initiator, showing the possibility of synthesizing copolymers between acrylates and perfluoropolyethers in common solvents. Protective efficiency of poly(methyl acrylate-co-perfluoropolyether) was close to that of commercially available products. Note de contenu : - EXPERIMENTAL : Instruments - Solvents and reagents - Synthesis of the monomers - Synthesis of polymers - Stone material - Performances of the polymers applied on stone materials - RESULTS AND DISCUSSION : Synthesis and characterization of polymers - Stability of polymers - Protective performances of polymers DOI : 10.1007/s11998-013-9495-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9495-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19799 [article]

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Preparation and surface properties of poly(2,2,2-trifluoroethyl methacrylate) coatings modified with methyl acrylate / An-hou Xu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 795-804 Titre : Preparation and surface properties of poly(2,2,2-trifluoroethyl methacrylate) coatings modified with methyl acrylate Type de document : texte imprimé Auteurs : An-hou Xu, Auteur ; Lu-qing Zhang, Auteur ; Jia-chen Ma, Auteur ; Yan-ming Ma, Auteur ; Bing Geng, Auteur ; Shu-xiang Zhang, Auteur Année de publication : 2016 Article en page(s) : p. 795-804 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymères Polyacrylate de méthyle Polyméthacrylates Solutions de polymère Surfaces -- Analyse Transition vitreuse Index. décimale : 667.9 Revêtements et enduits Résumé : A series of copolymers of 2,2,2-trifluoroethyl methacrylate (FMA) and methyl acrylate (MA) with different copolymer compositions were synthesized by solution polymerization. The chemical structure of copolymers was characterized by fourier transform infrared spectroscopy (FTIR), 1H NMR, and 19F NMR. The reactivity ratios for FMA (r1) and MA (r2) were found to be 1.83 and 0.31 by the Fineman–Ross method and 1.91 and 0.34 by the Kelen–Tudos method, respectively. The glass transition temperature of the copolymers decreased with increasing MA content and ranged from 77.5 to 13.4°C for a feed composition of 90 mol% MA monomer, while, according to water contact angle data, the hydrophilic properties of the copolymer coatings increased with increasing MA feed composition. Remarkably, when the feed composition of MA was 60 mol%, the glass transition temperature was reduced to 29.2°C, while the obtained copolymer exhibited comparable hydrophobic property to the PFMA homopolymer. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of poly(FMA-co-MA) - Copolymer coating preparation - Characterization - RESULTS AND DISCUSSION : Structure characterization - Determination of the monomer reactivity ratios - Thermal properties DOI : 10.1007/s11998-016-9793-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9793-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27116 [article]

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Relationship of leather break to grain and flesh layers stress - Strain properties / Jorge A. Vergara in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 63, N° 2 (03-04/1979)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 63, N° 2 (03-04/1979) . - p. 25-27 Titre : Relationship of leather break to grain and flesh layers stress - Strain properties Type de document : texte imprimé Auteurs : Jorge A. Vergara, Auteur ; Alberto Sofia, Auteur ; José Hidalgo van Dick, Auteur ; Victor D. Vera, Auteur Année de publication : 1979 Article en page(s) : p. 25-27 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Emulsions Homopolymères Matériaux -- Imprégnation Polyacrylate d'éthyle Polyacrylate de butyle Polyacrylate de méthyle Polymérisation en émulsion Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Rigidité (mécanique) Rupture (mécanique) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Four impregnating resins (homopolymers) were produced from methyl acrylate, ethyl acrylate, butyl acrylate and methyl methacrylate monomers respectively. The emulsion polymerisation method and other chemical agents were maintained constant. Upper leathers were impregnated with these resins following a statistical design which included non-impregnated leathers as controls. Leather break and stiffness were assessed before and after the impregnating process. The elasticity modulus at 2% extension was measured for ail leathers and also in their respective grain and flesh layers after splitting. From the results obtained several concrete facts emerged. First, the leather break and stiffness increased in the following resins order: butyl acrylate < ethyl acrylate= methyl methacrylate < methyl acrylate. Relationships of the grain layer elasticity modulus to the flesh layer one for the impregnated leathers (Mi grain/Mi flesh) and for the control leathers (Mc grain/Mc flesh) were calculated. It was found that an increase in the difference between these two relationships correlated very well with the increase found in the leather break. On the other hand, when the leathers were impregnated with film forming polymers, their elasticity modulus increased proportionally to the polymer hardness increase. Note de contenu : - EXPERIMENTAL : Impregnating emulsions - Leather ande application of the impregnating resin - RESULTS : Leather break - Stiffness - Elasticity modulus - Table 1 : Emulsion composition - Table 2 : Break (0 = poor ; 10 = escellent) control leather score = 5.0 - Table 3 : Stiffness (0 = soft ; 5 = extremely rigid) (control leather score = 2.0 - Table 4 : Impregnated leather elasticity modulus measured at 2% of strain (g/mm2) (control leather elasticity modulus = 1.444 g/mm2) - Table 5 : Relative variation of elasticity modulus (ΔMR) of grain and corium layers of impregnated leather referred to the control and break increase obtained with each resin emulsion En ligne : https://drive.google.com/file/d/1NNJQVVSKaupq3f55T1L04_U_ORQefQ0e/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34137 [article]

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