An improved laboratory reattachment method for the rapid assessment of adult barnacle adhesion strength to fouling-release marine coatings / Shane J. Stafslien in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 6 (11/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 6 (11/2012) . - p. 651-665 Titre : An improved laboratory reattachment method for the rapid assessment of adult barnacle adhesion strength to fouling-release marine coatings Type de document : texte imprimé Auteurs : Shane J. Stafslien, Auteur ; Justin W. Daniels, Auteur ; James A. Bahr, Auteur ; Bret J. Chisholm, Auteur ; Abdullah Ekin, Auteur ; Dean C. Webster, Auteur ; Beatriz Orihuela, Auteur ; Daniel Rittschof, Auteur Année de publication : 2012 Article en page(s) : p. 651-665 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Crustacés Marines (peinture) Revêtements antisalissures:Peinture antisalissures Test d'immersion Index. décimale : 667.9 Revêtements et enduits Résumé : Modifications have been made to the previously described adult barnacle laboratory reattachment method to enhance and improve the overall utility of this technique for rapidly assessing the efficacy of novel fouling-release marine coating technologies. These modifications include the use of an immobilization template to secure barnacles onto the coating surfaces during the underwater reattachment process, the development of a semi-automated push-off device to enable consistent and reproducible force gauge measurements and the implementation of a software tool to measure the diameter of barnacle base plates for adhesion strength calculations. A series of experimental siloxane–polyurethane and control coatings were evaluated with both the original and improved laboratory reattachment methodologies. Significantly higher adhesion strengths were obtained on these coatings using the improved reattachment method. Furthermore, only the improved reattachment method was able to discern significant differences in the performance of the siloxane–polyurethane coatings based on differences in compositional components. In this regard, the siloxane–polyurethane coatings containing the poly-caprolactone end groups attached to the poly(dimethylsiloxane) (PDMS) backbone exhibited significantly higher reattached barnacle adhesion strengths than the aminopropyl-terminated PDMS containing coatings. It was also shown that the utilization of barnacles with 5–6 mm base plate diameters, rather than 7–8 mm diameters, significantly enhanced the strength or tenacity of adhesion to the surface of the control coatings. The results of the improved laboratory reattachment evaluation of experimental siloxane–polyurethane and control coatings were in good agreement with barnacle adhesion measurements obtained for the same coatings with static ocean immersion testing in the field. Note de contenu : - EXPERIMENTAL : Coating preparation - Rearing and maintenance of adult barnacles - Reattachment procedure - Measurement of barnacle adhesion in shear - Static ocean immersion testing - Statistical analysis - RESULTS :Original vs improved laboratory reattachment method - Effect of barnacle basal diameter - Static ocean immersion testing DOI : 10.1007/s11998-012-9409-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9409-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16648 [article]

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Automated parallel polyurethane dispersion synthesis and characterization / Mohammed J. Nasrullah in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 1 (03/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 1 (03/2009) . - p. 1-10 Titre : Automated parallel polyurethane dispersion synthesis and characterization Type de document : texte imprimé Auteurs : Mohammed J. Nasrullah, Auteur ; Peter Schmitt, Auteur ; Richard R. Roesler, Artiste ; Dean C. Webster, Auteur ; Christy Gallagher-Lein, Auteur ; James A. Bahr, Auteur Année de publication : 2009 Article en page(s) : p. 1-10 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dispersions et suspensions Polymères -- Synthèse Polyuréthanes Solutions aqueuses (chimie) Index. décimale : 667.9 Revêtements et enduits Résumé : The synthesis of waterborne polyurethane dispersions (PUDs) using an automated parallel reactor system was explored. Waterborne PUDs are an important class of polymer dispersion that can be used in many applications such as coatings for wood finishing, glass fiber sizing, adhesives, automotive topcoats, and other applications. Herein, we present the synthesis of aqueous PUDs using a Chemspeed Autoplant A100â„¢ automated parallel reactor system. This is the first time a PUD has been synthesized using an automated parallel reactor system. The synthesis involves the formation of an isocyanate-terminated prepolymer followed by neutralization, dispersion in water, and chain extension. Details of the methodology are discussed with respect to the process of writing the program for the synthesis to synthesizing the PUD itself with the Chemspeed. It is demonstrated that an aqueous PUD can be synthesized with an automated parallel process and the unit-to-unit results are similar. Process variables such as agitator design, rate of neutralization, and rate of water dispersion are varied as these are the three major factors which lead to the desired end product property. The controlled addition of neutralizer, water, and chain extender is an added advantage with this automated technique and gave consistent results in all the units. The PUDs were characterized for their particle size, viscosity, and percent solids. DOI : 10.1007/s11998-008-9102-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9102-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4840 [article]

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Combinatorial materials research applied to the Combinatorial materials research applied to the development of new surface coatings XII: Novel, environmentally friendly antimicrobial coatings derived from biocide-functional acrylic polyols and isocyanates / Alex J. Kugel in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 1 (03/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 1 (03/2009) . - p. 107-121 Titre : Combinatorial materials research applied to the Combinatorial materials research applied to the development of new surface coatings XII: Novel, environmentally friendly antimicrobial coatings derived from biocide-functional acrylic polyols and isocyanates Type de document : texte imprimé Auteurs : Alex J. Kugel, Auteur ; James A. Bahr, Auteur ; Dean C. Webster, Auteur ; Robert J. Pieper, Auteur ; Shane J. Stafslien, Auteur ; Michael J. Jepperson, Auteur ; Scott M. Ebert, Auteur ; Lyndsi J. Vander Wall, Auteur ; Justin W. Daniels, Auteur ; Laura E. Jarabek, Auteur ; Bret J. Chisholm, Auteur Année de publication : 2009 Article en page(s) : p. 107-121 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Revêtements Staphylocoques Triclosan Le triclosan est un composé organochloré, proche des chlorophénols, qui possède des propriétés antifongiques et antibactériennes à large spectre. Il est aussi appelé 5-chloro-2-(2,4-dichlorophénoxy)phénol. Urethanes Index. décimale : 667.9 Revêtements et enduits Résumé : Novel, environmentally friendly antimicrobial coatings containing tethered biocide moieties derived from the ubiquitous biocide, triclosan, were synthesized and characterized using a high-throughput workflow. Triclosan was first modified with an acrylate functionality and, subsequently, copolymerized with hydroxyethyl acrylate and butyl acrylate using conventional free radical polymerization to form an array of acrylic polyol terpolymers. The polyols were characterized using nuclear magnetic resonance spectroscopy, differential scanning calorimetry, and gel permeation chromatography. Arrays of urethane coatings were produced from the array of acrylic polyol terpolymers and, subsequently, characterized using parallel dynamic mechanical thermal analysis, surface energy measurements, and various biological assays. The results of the biological assays showed that the coatings were effective toward inhibiting Staphylococcus epidermidis biofilm retention without leaching triclosan or other toxic components from the coating. The level of antimicrobial activity was found to increase with the content of triclosan moieties incorporated into the coating matrix. These results indicate that triclosan moieties tethered to a polymer matrix can impart antimicrobial properties via a contact-active, nonleaching (i.e., environmentally friendly) mechanism. Since S. epidermidis is one of the primary microorganisms associated with infection and failure of implanted medical devices, such as prosthetic heart valves, urinary catheters, and a variety of orthopedic implants, these coatings may have good potential for commercialization in some of these applications. DOI : 10.1007/s11998-008-9124-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9124-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4879 [article]

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Combinatorial materials research applied to the development of new surface coatings XI : a workflow for the development of hybrid organic–inorganic coatings / Bret J. Chisholm in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 1 (01/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 1 (01/2010) . - p. 23-37 Titre : Combinatorial materials research applied to the development of new surface coatings XI : a workflow for the development of hybrid organic–inorganic coatings Type de document : texte imprimé Auteurs : Bret J. Chisholm, Auteur ; Missy Berry, Auteur ; James A. Bahr, Auteur ; Jie He, Auteur ; Seva Balbyshev, Auteur ; Gordon P. Bierwagen, Auteur Année de publication : 2010 Article en page(s) : p. 23-37 Note générale : Bibliogr. Langues : Américain (ame) Tags : Hybrid  organic–inorganic  Coating  Magnesium  Corrosion  Combinatorial  High-throughput  Sol–gel  Surface  functionalization  Silica Index. décimale : 667.9 Revêtements et enduits Résumé : Interest in hybrid organic–inorganic (HOI) materials has grown rapidly in the last two decades. The appeal of this broad class of materials can be attributed to the unique combinations of properties that can be achieved by combining an inorganic phase with an organic phase. HOI materials can be divided into two basic categories: homogeneous systems derived from monomers or miscible organic and inorganic components, and heterogeneous, phase-separated systems with domains ranging from angstroms to micrometers in size. The structure of the inorganic component is dependent on the interaction of many variables such as pH, water content, overall solution concentration, solvent composition, temperature, and time. Due to the complexity of HOI materials, a combinatorial/high-throughput approach to the development of novel materials is highly desired. The authors have recently developed a combinatorial workflow for the synthesis and characterization of HOI coatings. Initial experimentation conducted with the workflow was focused on the development of primers for corrosion protection derived from a HOI binder system and magnesium particles. Both the homogeneous and heterogeneous HOI binders were investigated. With just one iteration of the combinatorial workflow, heterogeneous, moisture-curable HOI binders were identified, which enabled the formation of magnesium-rich primers that provided excellent corrosion protection to an aerospace aluminum alloy (Al 2024). DOI : 10.1007/s11998-009-9163-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9163-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8344 [article]

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