Styrene and BPO poly (urea-melamine-formaldehyde) microcapsules prepared via in situ polymerization to promote the self-healing properties of epoxy composites / Zhennan Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 6 (11/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 6 (11/2022) . - p. 1837-1850 Titre : Styrene and BPO poly (urea-melamine-formaldehyde) microcapsules prepared via in situ polymerization to promote the self-healing properties of epoxy composites Type de document : texte imprimé Auteurs : Zhennan Li, Auteur ; Hui Chen, Auteur ; Qinming Xu, Auteur ; Xing Li, Auteur ; Hongmei Ma, Auteur ; Qingmei Yuan, Auteur Année de publication : 2022 Article en page(s) : p. 1837-1850 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites Copolymère urée-mélamine-formaldéhyde Epoxydes Microcapsules Peroxyde de benzoyle Polymères autoréparants Polymérisation Styrène Index. décimale : 667.9 Revêtements et enduits Résumé : Styrene has the characteristics of low viscosity, low shrinkage, and excellent adhesion to a variety of polymer materials and is a good candidate for healing agents. In this work, styrene and benzoyl peroxide (BPO) are coated, respectively, by in situ polymerization using poly(urea-melamine-formaldehyde) as shell materials to prepare two microcapsules for self-healing materials. IR, SEM, TGA, and DTA characterize the morphology, structure, composition, and thermal properties of the microcapsules. The optimized reaction parameters of the BPO microcapsule are as follows: the combination ratio of emulsifier DBS and GA is 2:1 (0.2% + 0.1%). The pH value of in situ polymerization is 3, the stirring speed is 700 r/min, and the core-shell ratio is 1:1. The content of the two microcapsule cores can reach more than 80%. In addition, the fracture toughness and healing efficiency of the double-microcapsules epoxy self-healing composites containing 2.5, 5, 7.5, 10, and 12.5 wt% of styrene and BPO microcapsules are measured using a tapered double cantilever beam (TDCB) specimen. The weight ratio of the two microcapsules in all self-healing epoxy composites was 1:1. The results show that the healing efficiency reached 37.3% when the content of the two microcapsules was 12.5 wt% at room temperature after 24 h healing. DTA results also indicate that this system has good potential for spontaneous self-healing performance at room temperature. Note de contenu : - EXPERIMENTAL : Materials - Preparation of microcapsules - Preparation of epoxy specimens and fracture test - RESULTS AND DISCUSSION : Preparation of microcapsules - Self-healing efficiency - Self-healing behavior DOI : https://doi.org/10.1007/s11998-022-00655-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00655-5.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38501 [article]

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