Colloidal, morphological, thermal, rheological, and film properties of waterborne hyberbranched alkyd-acrylic resins / Edwin A. Murillo 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. 1223-1232 Titre : Colloidal, morphological, thermal, rheological, and film properties of waterborne hyberbranched alkyd-acrylic resins Type de document : texte imprimé Auteurs : Edwin A. Murillo, Auteur ; Judith Percino, Auteur ; Betty L. Lopez, Auteur Année de publication : 2019 Article en page(s) : p. 1223-1232 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Caractérisation Colloides -- Stabilité Copolymère alkyde acrylique Polymères -- Analyse Polymères en émulsion Polymères ramifiés Potentiel zeta Rhéologie Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne hyperbranched alkyd–acrylic resins (HAAR) are interesting materials that provide excellent properties yet require only low levels of solvent in formulations using them. However, they have been scarcely studied. Therefore, the goal of this work was to prepare and evaluate various properties of HAAR. These materials were obtained by miniemulsion polymerization from a hyperbranched alkyd resin (HAR), methyl methacrylate (MMA), butyl acrylate (BA), and acrylic acid (AA). The proportions of HAR:acrylic monomers were as follow: 50:50 (HAAR1), 40:60 (HAAR2), 30:70 (HAAR3), and 20:80 (HAAR4). The particle size increased with the content of HAR, but the colloidal stability, critical deformation, zeta potential, thermal stability, and hardness followed an opposite behavior. The order of colloidal stability of the HAAR miniemulsions was HAAR4 > HAAR3 > HAAR2 > HAAR1. The particle morphology of the HAAR was mainly core–shell, but acrylic and alkyd particles were also observed. In addition, all HAAR initially exhibited a reduction in complex viscosity (η*) with the increase in angular frequency. The thermal stability of the HAR was lower than that of the HAAR. The HAAR showed better resistance against a 0.10 M sodium hydroxide (NaOH) solution than HAR. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of the HAAR - Characterization - RESULTS AND DISCUSSION : IR analysis - DLS analysis - Zeta potential - Contact angle analysis - TEM analysis - TGA - Rheological analysis - Film properties DOI : 10.1007/s11998-019-00205-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00205-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33006 [article]

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Maleinized hyperbranched alkyd resins : structural, thermal, rheological and film properties / Jessica Duarte in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 229-242 Titre : Maleinized hyperbranched alkyd resins : structural, thermal, rheological and film properties Type de document : texte imprimé Auteurs : Jessica Duarte, Auteur ; Sindy Morales, Auteur ; Edwin A. Murillo, Auteur Année de publication : 2024 Article en page(s) : p. 229-242 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Anhydride maléique Chimie analytique Copolymères greffés Couches minces Polyalkydes Polymères -- Synthèse Polymères ramifiés Index. décimale : 667.9 Revêtements et enduits Résumé : In this work a hyperbranched alkyd resin (HBAR) was synthesized from a hyperbranched polyester polyol of fourth-generation (HBP4) and tall oil fatty acids. Furthermore, the HBAR was modified with several proportions (10, 20, 30, and 40 wt%) of maleic anhydride (MA) to obtain maleinized HBAR (HBARMAs). The structural, thermal, rheological, and film properties of the HBAR and HBARMAs were evaluated for the purpose of estimating the effect of MA content on the properties of the HBARMAs. HBARMAs exhibited hydroxyl values inferior to that of the HBAR and it decreased with the MA content. Infrared and proton nuclear magnetic resonance (1H NMR) analyses provided evidence of the formation of the HBAR and HBARMA. The number average molar mass () of the HBP4 was lower than that of the HBAR, but those of the HBARMAs were higher. Using dynamic light scattering analysis, it was observed that HBAR exhibited smaller hydrodynamic dimensions than HBARMAs. The glass transition temperature (Tg), onset decomposition temperature (Tonset), and viscosity (η) values of the HBARMAs increased with the MA content and it was higher than those of the HBAR. However, the drying time exhibited the opposite behavior. Note de contenu : - MATERIALS AND METHODS : Synthesis of HBAR - Synthesis of the HBARMAs - Characterizations of the materials - RESULTS AND DISCUSSION : AV, conversion percentage (CP), GD, and grafting efficiency (GE) - OHV, modification percentage (MP), number of OH groups that reacted (K) and unreacted (H) - IR analysis - 1 H NMR analysis - VPO analysis - DLS analysis - Thermal analysis - Rheological analysis - Film properties - Table 1 : AV, CP, GD, and EG of the HBAR and HBARMA samples - Table 2 : OHV, MP, K, and H of the HBAR and HBARMA samples - Table 3 : Results of VPO and d1 and d2 values of the HBAR and HBARMAs - Table 4 : Tg, Tonset, Tonset of the RAAR and RAARAM samples - Table 5 : Chemical resistance of the HBAR and HBARMA samples - Table 6 : Results of flexibility, adhesion, gloss, drying time, and hardness of the HBAR and HBARMA samples DOI : https://doi.org/10.1007/s11998-023-00833-z En ligne : https://drive.google.com/file/d/1kV_KRlhXBtJ9xHEWJap62xoMUGd1njDC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40443 [article]

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