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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Novel tailor-made diols for polyurethane coatings using a combination of controlled radical polymerization, ring opening polymerization, and click chemistry / Ankit Vora in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 4 (07/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 4 (07/2010) . - p. 409-417 Titre : Novel tailor-made diols for polyurethane coatings using a combination of controlled radical polymerization, ring opening polymerization, and click chemistry Type de document : texte imprimé Auteurs : Ankit Vora, Auteur ; Mohammed J. Nasrullah, Auteur ; Dean C. Webster, Auteur Année de publication : 2010 Article en page(s) : p. 409-417 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie click Polyaddition Polymérisation Polyuréthanes Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : Novel dihydroxy functional 3-arm star polymers were synthesized using a combination of atom transfer radical polymerization, ring opening polymerization, and click chemistry. The diols were characterized using gel permeation chromatography, Fourier transform infrared spectroscopy, and 1H NMR spectroscopy. The diols were incorporated into polyurethane coatings, which were characterized using differential scanning calorimetry, thermogravimetric analysis, pendulum hardness, water contact angle, and methyl ethyl ketone double rubs. The coatings showed an increase in the water contact angle values as the percentage of the polystyrene-based diol was increased. Similarly, the coatings with the poly(tert-butyl acrylate)-based diols showed a decrease in the glass transition temperature values with an increase in the diol content. It is expected that the use of controlled radical polymerization would allow for the synthesis of novel tailor-made functional polymers to achieve tunable coatings properties. DOI : 10.1007/s11998-009-9210-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9210-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9763 [article]

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