Crosslinking of collagen with acrylamide derivatives 1 : N-hydroxymethylacrylamide and N,N'-(1,2-dihydroxyethylene)-bisacrylamide / Li Ying in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXV (Année 1990)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXV (Année 1990) . - p. 78-86 Titre : Crosslinking of collagen with acrylamide derivatives 1 : N-hydroxymethylacrylamide and N,N'-(1,2-dihydroxyethylene)-bisacrylamide Type de document : texte imprimé Auteurs : Li Ying, Auteur ; Stephen H. Feairheller, Auteur ; F. Scholnick, Auteur Année de publication : 1990 Article en page(s) : p. 78-86 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Two derivatives of acrylamide, namely : N-hydroxymethylacrylamide and N,N'-(1,2-dihydroxyethylene)-bisacrylamide, were found to react rapidly and, at least in part, irreversibly with hide and skin collagen. As measured by shrinkage temperature, the two compounds effectively crosslinked the collagen and, with proper control, could serve as tanning agents. The reaction takes place under alkaline conditions but swelling of the protein was controlled by the addition of sodium sulfate to the reaction mixtures. Shrinkage temperatures of 85°C and higher were obtained. The products exhibited the required resistance to chemical and enzymic attack and, on a scale, were made into white or pale yellow leather, respectively. The results were compared to those obtained with formaldehyde and glyoxal. En ligne : https://drive.google.com/file/d/1WwDfDH253Q-n6L1gsMcfgXoEH7bycEdm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8613 [article]

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Epoxy-based smart coating with self-repairing polyurea-formaldehyde microcapsules for anticorrosion protection of aluminum alloy AA2024 / Chigoziri N. Njoku in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 3 (05-06/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 3 (05-06/2020) . - p. 797–813 Titre : Epoxy-based smart coating with self-repairing polyurea-formaldehyde microcapsules for anticorrosion protection of aluminum alloy AA2024 Type de document : texte imprimé Auteurs : Chigoziri N. Njoku, Auteur ; Weichen Bai, Auteur ; Innocent O. Arukalam, Auteur ; Lihui Yang, Auteur ; Baorong Hou, Auteur ; Demian I. Njoku, Auteur ; Li Ying, Auteur Année de publication : 2020 Article en page(s) : p. 797–813 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Anticorrosifs Anticorrosion Copolymère urée formaldéhyde Epoxydes Métaux -- Revêtements protecteurs Microcapsules Revêtement autoréparant Revêtement autoréparant:Peinture autoréparante Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Self-reparable microcapsules which can repair microcracks in the coating matrix and effectively inhibit the corrosion at the substrate/coating interface during service have been evaluated. The main objective was to fabricate an innovative pH-responsive permeability-switching polyurea-formaldehyde (PUF)-based microcapsule laden with 8-hydroxyquinoline (8-HQ) as the core material for the production of smart epoxy coating for the long-term protection of Al alloys. Combined improved barrier, active, and self-repairing properties indicating sort of triple-action corrosion mitigating ability of the modified epoxy-based smart coating was demonstrated by electrochemical impedance spectroscopy and scanning electron microscopy. The results indicate that the self-repairing action occurs via two mechanisms: firstly, by the initiation of chain mobility at the modified coating defects on heat treatment. Secondly, by the crosslinking of the swelled hydrogel present in the PUF shell wall via the various polymer–polymer interactions. The active corrosion protection was due to the (smart) pH response–release ability of the encapsulated inhibitor (8-HQ) with an increase in corrosion degree. Meanwhile, the even dispersal of the fabricated microcapsule with its intrinsic rough surface in the epoxy coating matrix contributed to the improved barrier and adhesive properties. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - RESULTS AND DISCUSSION : Microcapsule morphology - Loading amount of 8-HQ in PUF microcapsules - Chemical content of the microcapsule - Release profiles of loaded inhibitor - Barrier properties of the unscratched coating - Evaluation of the combined active and self-repairing ability of the coating - Physical performance assessments DOI : https://doi.org/10.1007/s11998-020-00334-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00334-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34109 [article]

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