Effect of carbon black on adhesion to plastics in solventborne 2K polyurethanes / Kalpana S. Katti in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 903 (04/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 903 (04/2000) . - p. 35-44 Titre : Effect of carbon black on adhesion to plastics in solventborne 2K polyurethanes Type de document : texte imprimé Auteurs : Kalpana S. Katti, Auteur ; Marek W. Urban, Auteur Année de publication : 2000 Article en page(s) : p. 35-44 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  Uréthanne  polymère  Pigment  minéral  Noir  carbone  Concentration  pigmentaire  volumique  Réticulation  Adhérence  Matière  plastique  ABS  Etude  expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : These studies show that when the pigment volume content (PVC) of carbon black particles increases in polyurethanes (PUR), NCO consumption increases, and the extent of H-bonded C=O species near the film-substrate (F-S) interface is enhanced. During crosslinking, polyurea (PUA) is produced, and its concentration levels near the F-S interface are diminished for unpigmented coatings, whereas for the same system containing carbon black, the PUA formation is enhanced. Although the presence of carbon black particles at the F-S interface results in diminished adhesion of 2K PUR to acrylonitrile-butadiene-styrene (ABS), adhesion is also affected by the presence of OH and C=O functionalities on ABS, which are potential sites for H- bonding to PUR. Stronger hydrogen donor affinity of N-H functionalities in PUA as compared to the N-H groups on PUR leads to increased H-bonding in the presence of carbon black. Enhanced intermolecular H-bonding in PUR due to the presence of carbon black particles competes with the F-S interfacial H-bonding that promotes adhesion. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5815 [article]

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Interfacial studies of crosslinked polyurethanes ; Part I. quantitative and structural aspects of crosslinked near film-air and film-substrate interfaces in solvent-borne polyurethanes / Anneke M. Kaminski in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 872 (09/1997)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 872 (09/1997) . - p. 55-66 Titre : Interfacial studies of crosslinked polyurethanes ; Part I. quantitative and structural aspects of crosslinked near film-air and film-substrate interfaces in solvent-borne polyurethanes Type de document : texte imprimé Auteurs : Anneke M. Kaminski, Auteur ; Marek W. Urban, Auteur Année de publication : 1997 Article en page(s) : p. 55-66 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie des surfaces Cinétique chimique Evaporation Hexane Isocyanates Polyacrylates Polymères réticulés Polyuréthanes Réticulation (polymérisation) Revêtements solvants Index. décimale : 667.9 Revêtements et enduits Résumé : One of the reactions leading to the formation of polyurethane (PU) crosslinked networks is the reaction of NCO and OH functionalities. In this study, we examined how crosslinking reactions of hexamethylene diisocyanate isocyanurate and polyacrylate near the film-air (F-A) and film-substrate (F-S) interfaces in urethane coatings may affect crosslink density as well as other network properties. While at the initial stages of the crosslinking reactions, solvent evaporation competes with the urethane network formation and isocyanate consumption changes at various depths from the F-A and F-S interfaces. Quantitative analysis of the NCO consumption as a function of depth showed that the NCO concentrations change from 2.35 x 10-5 to 2.09 x 10-5 M, while going from 0.27 to 1.14 μm. During reaction times not exceeding two to three hours, the NCO consumption at the F-A and F-S interfaces is consumed more rapidly. At low relative humidity conditions, excessive amounts of unreacted NCO exists at both the F-A and F-S interfaces. However, at the extended reaction times, NCO concentration levels at the F-S are greater than at the F-A interface, and the NCO concentration differences can be as high as 3 x 10-5 M. In this study we also examined how crosslinking reactions of hexamethylene diisocyanate (HDI) isocyanurate and polyacrylate near the F-S interfaces in urethane films may affect orientation and distribution of urethane functionalities. Note de contenu : - Sample preparation - Analytical methods - Dynamic mechanical thermal analysis measurements (DMTA) - Solvent specific evaporation rate measurements Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18281 [article]

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Interfacial studies of crosslinked urethanes : part II. The effect of humidity on waterborne polyurethanes ; a spectroscopic study / Anneke M. Kaminski in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 873 (10/1997)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 873 (10/1997) . - p. 113-121 Titre : Interfacial studies of crosslinked urethanes : part II. The effect of humidity on waterborne polyurethanes ; a spectroscopic study Type de document : texte imprimé Auteurs : Anneke M. Kaminski, Auteur ; Marek W. Urban, Auteur Année de publication : 1997 Article en page(s) : p. 113-121 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : In this study we examined isocyanate crosslinking reactions at the film-air (F-A) and film-substrate (F-S) interfaces of waterborne two-component (2K) urethanes as a function of depth and relative humidity (RH) using attenuated total reflectance (ATR) FTIR spectroscopy. Analysis of water/isocyanate reactions revealed urea formation which further interacts with water via H-bonding. Quantitative analysis of isocyanate consumption showed that the rates of film formation for waterborne polyurethanes are faster than equivalent solvent-borne polyurethanes. These studies showed that isocyanate consumption increases at high relative humidities. Examination of isocyanate consumption as a function of depth from the F-A and F-S interfaces showed that the isocyanate concentration increases when going from 0.65 to 1.14 ?m. Note de contenu : - EXPERIMENTAL : Sample preparation - Analytical methods Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18284 [article]

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Interfacial studies of crosslinked urethanes : part IV. Substrate effect on film formation in polyester waterborne polyurethanes / Marek W. Urban in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 896 (09/1999)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 896 (09/1999) . - p. 73-78 Titre : Interfacial studies of crosslinked urethanes : part IV. Substrate effect on film formation in polyester waterborne polyurethanes Type de document : texte imprimé Auteurs : Marek W. Urban, Auteur ; Claudia L. Allison, Auteur Année de publication : 1999 Article en page(s) : p. 73-78 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Matériau  revêtement'  'Peinture  eau'  émulsion'  'Uréthanne  polymère'  'Formation  film'  Subjectile  'Propriété  surface'  'Tension  superficielle'  'Réaction  interface'  Réticulation  'Etude  expérimentale'  Métal  'Matière  plastique'  Verre Index. décimale : 667.9 Revêtements et enduits Résumé : These studies examine the effect of substrate surface tension on crosslinking reactions in waterborne polyurethanes (PUR) applied to tin-plated steel, steel, polypropylene (PP), thermoplastic olefin (TPO), and glass. The results show that, relative to tin-plated steel, removal of tin-plating from a steel substrate increases isocyanate (NCO) consumption by 42% near the film-substrate (F-S) interface. When PUR is allowed to crosslink on steel, PP, TPO, and glass, the NCO concentration is greater at the film-air (F-A) interface. Furthermore, crosslinking reactions result in a greater amount of urea-hydrogen bonded species near the F-S interface for all substrates. While an increase ofsubstrate surface tension decreases the amount of urea-hydrogen bonded carbonyl groups near the F-S interface, TPO was found to exhibit different behavior due to talc stratification near the surface. In this case, the presence of talc in WB-PUR coatings or thermoplastic substrates decreases the amount of hydrogen-bonded species and increases NCO consumption. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17941 [article]

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Modern methods in coatings analysis / Marek W. Urban in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8/00 (07-08/2000)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8/00 (07-08/2000) . - p. 58-59 Titre : Modern methods in coatings analysis Type de document : texte imprimé Auteurs : Marek W. Urban, Auteur Année de publication : 2000 Article en page(s) : p. 58-59 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Although there are numerous surface sensitive techniques utilized in polymer surface analysis, many require high vacuum operating conditions or sample preparation. Certain Fourier transform infrared (FT-IR) techniques offer surface sensitivity and selectivity without vacuum limitations and broader range of applications: attenuated total reflection (ATR), reflectance-absorbance (R-A) as well as continuosscan and step-scan photoacoustic (SS PAS), two-dimensional (2-D), and rheophotoacoustic (RPA) measurements. Note de contenu : - A wide variety of coatings samples can be studies by attenuated total reflection (ATR) - Photoacoustic spectroscopy for analysis of opaque specimens - Rheo-photoacoustic FT-IR allows detection of the work of adhesion - Possibilities of application Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11018 [article]

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Quantitative determination of isocyanate concentration in crosslinked polyurethane coatings / Bret W. Ludwig in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 857 (06/1996)

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Why organic coatings stratify / Marek W. Urban in EUROPEAN COATINGS JOURNAL (ECJ), N° 1-2/03 (01-02/2003)  

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