Alkali-soluble resins (ASR) and acrylic blends : influence of ASR distribution on latex film and paint properties / Wenjun Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 4 (07/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 4 (07/2016) . - p. 655-664 Titre : Alkali-soluble resins (ASR) and acrylic blends : influence of ASR distribution on latex film and paint properties Type de document : texte imprimé Auteurs : Wenjun Wu, Auteur ; Steve Severtson, Auteur ; Christopher Miller, Auteur Année de publication : 2016 Article en page(s) : p. 655-664 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages polymères Bases (chimie) Latex Microscopie Polyacryliques Polymères -- Solubilité Revêtements organiques Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : Alkali-soluble resins (ASRs) are a special type of polymeric surfactant containing both hydrophobic moieties and carboxylic acid functional groups. Upon ionization, ASRs provide electrosteric stabilization to the latex particles, thus allowing reduction or even elimination of conventional surfactants while maintaining or improving latex stability. The distribution of ASR in the dried film depends on its miscibility with the latex polymer. Its presence in the blend system is expected to alter the film formation process and consequently performance properties of paint products based on the latex blends containing ASR. In this study, the effects of a high Tg, alkali-soluble resin (ASR), poly(styrene/alpha-methylstyrene/acrylic acid) terpolymer on the properties of latex and paint films were examined. The film formation of a soft acrylic latex in the absence and presence of the ASR was evaluated using a variety of analytical techniques. As expected, paint properties such as scrub resistance, wet adhesion, and block resistance were also affected by the inclusion of ASR. The results provide new insights into the structure and surface morphology of latex and paint films containing ASRs, as well as their impact on mechanical and the performance properties. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Characterization of polymers - Evaluation of paint films - RESULTS AND DISCUSSION : Latex film formation in the presence of ASR - Tensile and elongation of acrylic polymer and ASR/AL blends - Contact angle (CA) of acrylic polymer and ASR/AL blends - Film morphology and ASR distribution via AFM - Quantitative analysis of ASR distribution by CRM DOI : 10.1007/s11998-016-9792-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9792-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26746 [article]

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Block resistance of low-VOC acrylic paints / Wenjun Wu in COATINGS TECH, Vol. 6, N° 8 (09/2009)

[article]  inCOATINGS TECH > Vol. 6, N° 8 (09/2009) . - p. 22-26 Titre : Block resistance of low-VOC acrylic paints : influences of latex design parameters Type de document : texte imprimé Auteurs : Wenjun Wu, Auteur ; Michael Anderson, Auteur ; Jeff Schneider, Auteur Année de publication : 2009 Article en page(s) : p. 22-26 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Formulation (Génie chimique) Latex Polyacryliques Revêtements organiques Surfactants Transition vitreuse Index. décimale : 667.6 Peintures Résumé : One of the biggest challenges for low-VOC coatings is simultaneously attaining smooth film formation and acceptable block resistance and film hardness. Block resistance is a function of bulk and surface properties. This article investigates the influences of some latex design parameters on block resistance of acrylic paints. The effects of latex particle size, surfactant choice, and polymer Tg are discussed. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6256 [article]

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Confocal microscopy techniques for coatings research / Wenjun Wu in COATINGS TECH, Vol. 16, N° 5 (05/2019)  

[article]  inCOATINGS TECH > Vol. 16, N° 5 (05/2019) . - p. 34-45 Titre : Confocal microscopy techniques for coatings research : Surface and depth characterization of latex paint films Type de document : texte imprimé Auteurs : Wenjun Wu, Auteur ; Dana Garcia, Auteur ; Jeffrey Schneider, Auteur Année de publication : 2019 Article en page(s) : p. 34-45 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Copolymère styrène acrylique Latex Microscopie confocale à balayage laser Nettoyabilité Résistance aux taches Revêtements -- Analyse:Peinture -- Analyse Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne coatings are multi-component, heterogeneous systems containing a variety of additives, in addition to water, polymer binders, and pigment particles. The distribution of various ingredients in the coating films directly affects a coating’s appearance and performance ; for example, optical properties, substrate adhesion, chemical resistance, and mechanical durability. Over the years, a plethora of analytical tools have been utilized in coatings characterization and defect identification. Microscopy and vibrational spectroscopy are complementary techniques and the combination of the two can provide the most complete information regarding the distributions of different coatings ingredients, as well as the fate and the impact of liquids or particulates that come into contact with the dried coating films. Note de contenu : - EXPERIMENTAL - MATERIALS : Latex and paint samples - Fluorescence of concord grape juice - Confocal Raman microscopy - Confocal laser scanning microscope techniques - Stain resistance and washability - RESULTS AND DISCUSSION : Example 1 : spatial distribution of styrenated additive in acrylic paint films - Example 2 : Surfactant enrichment on paint film surface - - Example 3 : Characterization of stain resistance, stain penetration, and stain removal : Selection of representative staining material and paint samples - Vizualization and quantification of stain penetration using CLSM - Characterization of stain adsorption, penetration and removal using CRM - Fig. 1 : Raman spectra of Paint I-SA film - Fig. 2 : Raman spectra of Paint I-SA film: 4000~800 cm1 - Fig. 3 : Depth attenuation of TiO2 and styrene (20X) bands in Paint I-SA film - Fig. 4 : Raman intensity ratios of styrene to acrylic in Paint I-SA film - Fig. 5 : Raman spectra of Paint I film : 4000~800 cm1 - Fig. 6 : 2nd derivatives of Raman spectra for Paint I film before (6a) and after water rinse (6b) - Fig. 7 : Fluorescence emission spectrum of Welch’s Concord grape juice diluted in water - Fig. 8 : Stain removal or washability performance of Paint I and Paint II - Fig. 9 : Fluorescence images of acrylic polymer AP2 film (blue) stained by grape juice - Fig. 10 : Fluorescence images of grape juice-stained AP2 film after sponge wash using Formula 409 - Fig. 11 : Raman spectrum of partially dried grape juice - Fig. 12 :Fluorescence emission and unshifted Raman spectra of Concord grape juice - Fig. 13 : Grape juice-stained and unstained surface spectra of Paint I films - Fig. 14 : Spectra of unstained and grape juice-stained Paint I (14a) and Paint II (14b) - Fig. 15 : Difference in discoloration of Paint I and Paint II surfaces by grape juice - Fig. 16 : Effect of staining time on Paint I (16a) and Paint II (16b) surfaces - Fig. 17 : Discoloration or color change as a function of grape juice residence time - Fig. 18 : Effect of washing procedure: sponge wash vs water rinse En ligne : https://drive.google.com/file/d/10cF15960T-Isv7D7D5OMH6daBGCNj1GG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32559 [article]

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Latex design and coating film properties / Christopher Miller in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8 (07-08/2019)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8 (07-08/2019) . - p. 48-59 Titre : Latex design and coating film properties : A fundamental knowledge of structure-property relationships can aid the development of high-performance latex products Type de document : texte imprimé Auteurs : Christopher Miller, Auteur ; Wenjun Wu, Auteur Année de publication : 2019 Article en page(s) : p. 48-59 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Analyse mécanique dynamique Caractérisation Latex Lixiviation Nettoyabilité Polyacryliques Produits de lixiviation Revêtements -- Analyse:Peinture -- Analyse Surfactants Taches Index. décimale : 667.9 Revêtements et enduits Résumé : Industry long ago developed a number of methods for testing paint performance, but these do not reflect real-world failure mechanisms. Combining mechanical testing with analytical techniques provides deeper insights into the basic mechanism driving the different performance observed in the industry standard tests. Note de contenu : - Time to delive deeper - Experimental : Materials. Latex samples - Paint formulations for three case studies - Paint testing and analytical characterisation - Dynamic mechanical analysis - Confocal Raman microscopy - Inductively coupled plasma-mass spectrometry - Liquid chromatography-electrospray ionization-mass spectrometry - Scanning electron microscope - Case study 1 : Confocal techniques to investigate stain adsorption, stain penetration and stain removal - CRM : Adsorption and penetration of grape juice stain - Improving washability performance - Case study 2 : Optimising block resistance and print resistance - Surface contribution to block resistance - Impact of viscoelastic properties on print resistance - Controlling latex particle morphology to balance film formation and hardness - Case study 3 : Reducing surfactant leaching (AKA "Snail trails" or "Snail tracks") - Chemical analysis of leachates from paint A and paint B - Film properties of paint A and paint B - Technical solutions to surfactant leaching - Scheme 1 : Typical product development cycle - Table 1 : Acrylic polymers for case study 2 - Table 2 : Paint formulations used in three case studies - Table 3 : Film properties of homogeneous vs. structured latexes - Table 5 : Mg, K, and Na in dry leachates as percentages of their concentrations in paint serums - Table 6 : Block resistance comparison for old and new acrylic binders in paint B - Fig. 1 : CRM data of grape juice-shained paint I and paint II in relation to AE colour change - Fig. 2 : Washability performance of Paint I and Paint II. (Stains from left to right : mustard, ketchup, hot coffee, red wine, blue ink). - Fig. 3 : Effects of polymerisation surfactants on block and print resistance - Fig. 4 : Frequency scans of HP-CY latex films at 25°C - Fig. 5 : Frequency scans of SP-CY films with and without 5% Optifilm 400 at 25°C - Fig. 6 : Photos of HP-CY and SP-CY paint films after LTC test - Fig. 7 : Block and print resistance of SP-CY compared to commercial high-gloss paints - Fig. 8 : Contributions of acrylic latex and paint formulation to surface leaching of paint B - Fig. 9 : SEM images of cross-sections of paint A and paint B En ligne : https://drive.google.com/file/d/1U--_Xuv8T_1aE0HVhiX0BJsRMaWQtOxE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32796 [article]

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New acrylic polymer for high performance interior wall paints / Wenjun Wu in COATINGS TECH, Vol. 13, N° 8 (08/2016)  

[article]  inCOATINGS TECH > Vol. 13, N° 8 (08/2016) . - p. 28-35 Titre : New acrylic polymer for high performance interior wall paints Type de document : texte imprimé Auteurs : Wenjun Wu, Auteur ; Michael Kaufman, Auteur ; Jeffrey Schneider, Auteur ; Ronald Grieb, Auteur Année de publication : 2016 Article en page(s) : p. 28-35 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Brillance (optique) Etudes comparatives Formulation (Génie chimique) Peinture -- Lavage Polyacryliques Résistance à l'abrasion Résistance aux taches Revêtement mural:Peinture murale Revêtements intérieurs:Peinture intérieure Revêtements organiques Revêtements:Peinture Index. décimale : 667.6 Peintures Résumé : A benchmarking study examining the interior wall paints recently introduced into the market was conducted to understand the general trend and to baseline the stain resistance and washability performance of these new products. Note de contenu : - EXPERIMENTAL : Commercial paints - Paint formulations - Gloss and contrast ratio of dry film - Block resistance - Wet adhesion - Scrub resistance - Tannin blocking - Stain resistance and washability - RESULTS AND DISCUSSION : Commercial interior SG and flat paints - Properties of SG commercial paints - Properties of flat commercial paints - Stain resistance and washability of commercial interior paints - High performance acrylic polymers - TABLES : 1. Commercial interior paints selected for benchmarking - SG formulation - 3. Flat formulation - 4. Performance summary of commercial SG paints - 5. Performance summary of commercial flat paints - 6. Performance summary of experimental paints-based on API, APII, APIII - FIGURES : 1. Advertised product features of commercial interior paints - 2. Washability of commercial interior paints against hydrophilic stains - 3. Washability of commercial interior paints against hydrophobic stains - 4. Washability of SG experimental paints vs commercial SG paints - 5. Washability of flat experimental paints vs commercial flat paints En ligne : https://drive.google.com/file/d/196sJdKIl4zlGao-EeeF_hR481DTaP3GR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27045 [article]

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Stress development and film formation in multiphase composite latexes / Kyle Price in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 6 (11/2014)  

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Tailoring HASE rheology through polymer design : Effects of hydrophobe size, acid content, and molecular weight / Wenjun Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 6 (04/2005)  

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