Synthesis, analysis, and application of lactide-based polyester as coating with improved mechanical and rheological behavior / Rushikesh S. Chanpurkar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 6 (11/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 6 (11/2021) . - p. 1659-1668 Titre : Synthesis, analysis, and application of lactide-based polyester as coating with improved mechanical and rheological behavior Type de document : texte imprimé Auteurs : Rushikesh S. Chanpurkar, Auteur ; Gajanan P. Lakhawat, Auteur ; Ruta D. Khonde, Auteur Année de publication : 2021 Article en page(s) : p. 1659-1668 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Anticorrosifs Anticorrosion Biomatériaux Caractérisation Essais de brouillard salin Lactide Le lactide est le diester cyclique de l’acide lactique et le monomère qui permet de synthétiser le PLA (Poly Lactique Acide) par polymérisation d’ouverture de cycle (ROP). Issu de l’acide lactique (ou acide 2-hydroxypropanoïque) et produit par fermentation du saccharose ou du glucose, le lactide est d’origine naturelle et renouvelable. Ce produit s’inscrit parfaitement dans le cadre du développement de la chimie verte. Le lactide, étant issu de l’acide lactique qui possède 2 formes stéréo-isomériques (acide lactique L(+) et acide lactique D(-)),existe sous 3 formes stéréo-isomériques : la forme L-lactide, la forme D-lactide et la forme Méso-lactide. Métaux -- Revêtements protecteurs Polycondensation Polyesters Polymères -- Synthèse Revêtements -- Propriétés mécaniques Revêtements organiques Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Lactide-based polyester resin was synthesized from diethylene glycol and phthalic anhydride with 20, 30, and 40% lactide compositions. The lactide was prepared from lactic acid and the polyester resin was functionalized with carbon–carbon crosslinking by polycondensation reaction. The purpose of this investigation was to enhance the properties such as thermal, mechanical, and rheological behavior of polyester resin synthesized using lactide. The resin was also characterized for acid values, hydroxyl values, and bio-based content. The bio-based content varied from 76 to 92% for variable composition of lactide in the resin. Acid value confirmed the formation of polyester resin and the hydroxyl value indicated the occurrence of crosslinking. The flow viscosity is an important characteristic of resins that are intended to be used as matrix in composite applications, and it was measured at different stress levels at varied temperatures. The performance of a mild steel specimen coated with the synthesized polyester was evaluated for mechanical properties such as tensile strength, impact resistance, flexibility, scratch resistance, and adhesion test. It revealed that lactide-based polyester resin had better mechanical, rheological, and anticorrosive properties than simple polyester resins. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of lactide - Preparation of lactide-based polyester - CHARACTERISATION : FTIR analysis - Acid value - Hydroxyl value - Bio-based content - Viscosity measurement - Mechanical analysis - RESULTS AND DISCUSSION : FTIR analysis - Acid value and hydroxyl value - Bio-based content - Rheological analysis - Mechanical analysis - Adhesion strength - Salt spray test - Table 1 : Rheological properties of lactide-based polyester - Table 2 : Mechanical properties of lactide-based coating DOI : https://doi.org/10.1007/s11998-021-00525-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00525-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36823 [article]

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