Biocolonisation of polymer-modified mortars / Lucy Travailleur in MATERIAUX & TECHNIQUES, Vol. 108, N° 3 (2020)  

[article]  inMATERIAUX & TECHNIQUES > Vol. 108, N° 3 (2020) . - 10 p. Titre : Biocolonisation of polymer-modified mortars Type de document : texte imprimé Auteurs : Lucy Travailleur, Auteur ; Marielle Gueguen-Minerbe, Auteur ; Issam Nour, Auteur ; Sandrine Marceau, Auteur ; Emmanuel Keita, Auteur ; Thierry Chaussadent, Auteur Année de publication : 2020 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Français (fre) Catégories : Algues unicellulaires Biocolonisation Biodégradation Composites Copolymère styrène acrylate Egouts Mortier Polyacryliques Index. décimale : 668.9 Polymères Résumé : Polymer-modified mortars are cementitious materials that integrate polymers from 5 to 20 wt.%. Those materials are widely used for protecting and/or repairing concrete surfaces among which building facades, civil engineering structures, or sewage networks. In this context, polymer-modified mortars are applied into thin layers of about 1–3 cm. However, previous studies performed regarding such materials were carried out on massive pieces and did not consider the interactions between polymer-modified mortars and microorganisms. Nevertheless, such interactions can lead to undesired aesthetical or structural modifications of those materials. As a result, the main objective of this paper is to evaluate the resistance to biocolonisation of polymer-modified mortars applied into thin layers in environmental conditions that are representative of the on-site applications. Two formulations of polymer-modified mortars and a polymer-free mortar are characterised in the hardened state. Then, the resistance of those mortars to biocolonisation is tested by means of two laboratory accelerated tests. The first experiment is performed in order to recreate biofouling at the surface of the specimens, while the second one exposes the materials to biodeterioration. The results and analyses show that in the presence of polymer, both porosity and capillary absorption of mortars are reduced, but this does not allow preventing or slowing down biocolonisation. In addition, this study suggests that the nature of the polymer has an influence on bioreceptivity of polymer-modified mortars. Finally, our results suggest that in the presence of polymer, the global material may have an improved inner cohesion. Note de contenu : - MATERIALS AND METHODS : Materials and sample preparation - Hardened mortars characteristisation - Accelerated biocolonisation devices - RESULTS : Characteristics of hardened mortars - Biofouling of polymer-modified mortars - Biodeterioration of polymer-modified mortars - Table 1 : Polymer characteristics - Table 2 : Characteristics of the surface bubbling - Table 3 : Sorption coefficient, porosity and bulk density of mortars - Table 4 : Visual evolution of the samples over the experiment and pH range associated - Table 5 : Profile of the samples after 16 weeks in the biodeterioration chamber - Table 6 : Visual observation of mortars before and after sonication Référence de l'article : 305 DOI : https://doi.org/10.1051/mattech/2020026 En ligne : https://www.mattech-journal.org/articles/mattech/pdf/2020/03/mt190083.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35635 [article]

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Effect of particle size distribution on stress development and microstructure of particulate coatings / Yan Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 2 (03/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 2 (03/2017) . - p. 455–465 Titre : Effect of particle size distribution on stress development and microstructure of particulate coatings Type de document : texte imprimé Auteurs : Yan Wu, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2017 Article en page(s) : p. 455–465 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbonate de calcium broyé Copolymère styrène acrylate Dispersions et suspensions Granulométrie Latex Liants Microstructures -- Analyse Particules (matières) Revêtement -- Séchage Index. décimale : 667.9 Revêtements et enduits Résumé : The role of pigment particle size distribution on stress and microstructure development was studied for coatings prepared from aqueous suspensions of ground calcium carbonate (GCC) and latex binder. Stress development was monitored using a modified beam deflection technique under controlled environment. Microstructure was characterized by scanning electron microscopy (SEM) and cryogenic SEM. For coatings containing only GCC particles and no latex, a wide particle size distribution resulted in a significant particle size gradient in the cross-sectional microstructure and irregular stress development. With latex addition, uniform microstructures were observed in coatings with either wide or narrow GCC particle size distribution. GCC/latex coatings prepared using GCC with a wide particle size distribution developed a higher stress than those prepared using GCC with a similar average particle size but a narrow particle size distribution. The higher stress is related to the particle packing that results in smaller pore sizes and larger capillary pressures that drive compaction. In coatings prepared with the same GCC particles but different latex binders, the stress and cracking behavior of the coating depends on the latex properties. Note de contenu : - MATERIALS AND METHODS : Suspension systems - Drying stress measurement - Microstructure characterization - RESULTS AND DISCUSSION : Coatings prepared from GCC suspensions - Coatings prepared with GGC and styrene acrylate latex - Coatings prepared with GCC-W and different types of latex DOI : 10.1007/s11998-016-9866-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9866-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28160 [article]

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Effects of colloidal silica on the properties of POSS-containing fluorinated poly(styrene–acrylate)/SiO2 composite materials / Wenbo Liao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 1 (01/2021) . - p. 107-116 Titre : Effects of colloidal silica on the properties of POSS-containing fluorinated poly(styrene–acrylate)/SiO2 composite materials Type de document : texte imprimé Auteurs : Wenbo Liao, Auteur ; Liuyong Zou, Auteur ; Shaona Zheng, Auteur ; Lili Zhao, Auteur ; Xiangxuan Huang, Auteur ; Lingyun Ye, Auteur ; Guoyu Zhong, Auteur Année de publication : 2021 Article en page(s) : p. 107-116 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Colloides Copolymère styrène acrylate Copolymères greffés Dioxyde de silicium Hydrophobie Revêtements organiques Rugosité Silsesquioxanes oligomères polyhèdres Sol-gel, Procédé Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Polyhedral oligomeric silsesquioxane (POSS)-containing fluorinated poly(styrene–acrylate)/SiO2 (POSS-FPSA/SiO2) composite materials were prepared by preemulsification and direct blending method. The SiO2 particles were induced aggregated onto the surface of POSS, and sol–gel processes were simultaneously carried out with addition of co-solvent to form raspberry-like structure. 29Si NMR and XRD results confirmed that POSS were successfully grafted to polymer and were evenly dispersed uniformly in polymer matrix. The average diameter of composite latexes increased from 63 to 81 nm with increasing addition of SiO2 content. AFM and WCA images confirmed that sol–gel processes were promoted by increasing addition of SiO2 content, which improved the roughness and hydrophobicity of composite films. XPS spectra displayed that two kinds of Si–O bonds existed on the surface of composite films. One was related to the Si–O groups of SiO2, and the other was attributed to the Si–O–Si groups obtained from the sol–gel processes. The peak area of the former decreased from 56.86% to 38.78%, while the latter increased from 43.14% to 62.22%. TGA curves demonstrated that the composite film exhibited better thermal stability when the SiO2 content was 10.0%. In addition, serious phase separation would decrease the thermal stability of composite films. Note de contenu : - EXPERIMENTAL : Materials - Preparation of POSS-FPSA/SiO2 composite materials - Characterization - RESULTS AND DISCUSSION : The preparation and structure of POSS-FPSA SiO2 composite materials - Effects SiO2 content on the properties of POSS-FPSA/SiO2 composite materials - Scheme : The synthetic route of PSA, POSS-FPSA, and POSS-FPSA/SiO2 DOI : https://doi.org/10.1007/s11998-020-00384-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00384-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35355 [article]

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Facile fabrication of fluorine–silicon-containing poly (styrene–acrylate)/SiO2 hydrophobic composites by combining physically mixing and sol–gel process / Lingyun Ye in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1243-1252 Titre : Facile fabrication of fluorine–silicon-containing poly (styrene–acrylate)/SiO2 hydrophobic composites by combining physically mixing and sol–gel process Type de document : texte imprimé Auteurs : Lingyun Ye, Auteur ; Guanhao Ma, Auteur ; Shaona Zheng, Auteur ; Xiangxuan Huang, Auteur ; Lili Zhao, Auteur ; Hongbin Luo, Auteur ; Wenbo Liao, Auteur Année de publication : 2019 Article en page(s) : p. 1243-1252 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites Copolymère styrène acrylate Dioxyde de silicium Fluor Gel de silice Hydrophobie Sol-gel, Procédé Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Novel hydrophobic composites (FS-PSA/SiO2) were prepared by directly physically mixing fluorine–silicon-containing poly (styrene–acrylate) latexes (FS-PSA) with colloidal silica. Sol–gel processes were carried out between silica particles and silanol groups on the surface of poly (styrene–acrylate) latexes to enhance the roughness and hydrophobicity of composite films. TEM photos revealed that FS-PSA latexes exhibited a clear core–shell structure, and the intermolecular hydrogen bonding guaranteed the uniform dispersion of silica particles. The average diameter data indicated that the copolymerization and sol–gel process had all increased the average diameter of the composite latexes. FTIR and XPS spectra confirmed that two kinds of Si–O bonds existed in the composite films, of which one was related to the Si–O groups of colloidal silica while the other was related to the Si–O–Si groups obtained from the sol–gel processes. SEM and AFM images revealed that the sol–gel processes had increased the roughness of the composite films. The water contact angle (WCA) of the composite films were found to increase with the copolymerization and sol–gel processes. Thermogravimetric analysis (TGA) curves demonstrated that the FS-PSA/SiO2 composite films exhibited much better thermal stability than the PSA and FS-PSA films. Note de contenu : - EXPERIMENTAL : Materials - Preparation of poly(styrene-acrylate) (PSA) and fluorine-silicone-containing poly(styrene-acrylate) materials (FS-PSA) - Preparation of FS-PSA/SiO2 composites - RESULTS AND DISCUSSION : The preparation of the FS-PAS and FS-PAS/SiO2 composites - The chemical structure - The surface wetting property and surface morphology - Formation mechanism of composite films - The thermal stability DOI : 10.1007/s11998-019-00198-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00198-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33008 [article]

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Synthesis of buty acrylate-styrene-TMI latexes and their application as water-based coatings / Luis E. Elizalde 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. 911-919 Titre : Synthesis of buty acrylate-styrene-TMI latexes and their application as water-based coatings Type de document : texte imprimé Auteurs : Luis E. Elizalde, Auteur ; Juan J. Mendoza, Auteur ; Raquel Ledezma-Rodriguez, Auteur ; Maria E. Trevino, Auteur ; Margarita Mondragon, Auteur Année de publication : 2020 Article en page(s) : p. 911-919 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique) Caractérisation Copolymère styrène acrylate Essais d'adhésion Essais de résilience Essais dynamiques Latex Liants en phase aqueuse Résistance à l'abrasion Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Self-crosslinking styrene-acrylic latexes functionalized with 3-isopropenyl-α,α-dimethyl benzyl isocyanate (TMI) by semibatch emulsion polymerization were prepared. Polymerizations were performed in emulsions with aerosol EF-800 surfactant; remarkable colloidal stability of the copolymer latexes was measured in fresh and aged samples. The effects on film formation, tensile properties, permeability to water vapor, and oxygen were evaluated by varying the TMI concentrations (from 0 to 6 wt%). The obtained latexes were used as binder to prepare water-based coatings, which were applied on steel specimens; hydrolysis of TMI acts as a self-crosslinked promoter once the film was applied. Adhesion tests, scratch hardness, and gloss properties were evaluated. Note de contenu : - EXPERIMENTAL SECTION : Materials - Emulsion polymerization general procedure - Latex film formation - Water-based coatings preparation - RESULTS AND DISCUSSION : Polymerizations - Film characterization - Film permeability - Water-based coatings DOI : https://doi.org/10.1007/s11998-020-00325-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00325-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34380 [article]

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