Multifunctional polyurethane coatings with excellent antifouling and self-healing properties / Haoran Wei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1333-1342 Titre : Multifunctional polyurethane coatings with excellent antifouling and self-healing properties Type de document : texte imprimé Auteurs : Haoran Wei, Auteur ; Henghui Liu, Auteur ; Min Li, Auteur ; Zhinan Fu, Auteur ; Liqun Liu, Auteur ; Hanjie Zhang, Auteur ; Chuanjie Fan, Auteur ; Jun Xu, Auteur ; Jie Wang, Auteur Année de publication : 2024 Article en page(s) : p. 1333-1342 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Hydrophobie Liaisons disulfures Matériaux -- Propriétés fonctionnelles Matériaux intelligents Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Polyuréthanes Revêtement autoréparant Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermiques Revêtements antisalissures Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Polydimethylsiloxane (PDMS) has been widely used to improve the antifouling properties of polyurethane (PU) coatings due to its low surface energy. Herein, a novel type of waterborne polyurethane (WPU) coating with good antifouling and self-healing abilities was synthesized by incorporating PDMS and disulfide bonds. The effects of PDMS and the disulfide content on the thermal, mechanical and surface properties of the coatings were investigated. Benefiting from a rational structural design, the obtained WPU coating manifested superior antifouling properties. In addition, the WPU coating exhibited good healing capabilities owing to the collaboration between dynamic disulfide bonds. Interestingly, the self-healing of an experimental crack occurred at a temperature above 60°C, and the coating recovered its mechanical properties to 95%. This finding has great significance for the design of multifunctional smart coatings for diverse applications. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the coating - Characterization - RESULTS AND DISCUSSION : Structural analysis - Thermal and mechanical properties - Hydrophobic property - Antifouling property - Self-healing property DOI : https://doi.org/10.1007/s11998-023-00896-y En ligne : https://drive.google.com/file/d/1SumbkTcSkqlcj9qWHVNxig5BMOvY-02V/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41301 [article]

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Reconnection of cysteine in reduced hair with alkylene dimaleates via thiol-Michael click chemistry / Yuwen Wu in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 46, N° 3 (06/2024)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 46, N° 3 (06/2024) . - p. 457-467 Titre : Reconnection of cysteine in reduced hair with alkylene dimaleates via thiol-Michael click chemistry Type de document : texte imprimé Auteurs : Yuwen Wu, Auteur ; Ling Ma, Auteur ; Timson Chen, Auteur ; Kuan Chang, Auteur ; Jing Wang, Auteur Année de publication : 2024 Article en page(s) : p. 457-467 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cheveux -- Propriétés mécaniques Cheveux -- Soins et hygiène Chimie click Cosmétiques Dimaléate d'alkylène Fibres kératiniques Liaisons disulfures Thiols Index. décimale : 668.5 Parfums et cosmétiques Résumé : - OBJECTIVES : Conventional hair permanent waving (PW) and permanent straightening processes typically involve two steps: reduction, for breaking -S-S- bond in cystine into cysteine and oxidation for -S-S- bond reconnection. However, it is known that the hair incurs damage during the oxidation step. In this work, we proposed a novel strategy to reconnect reduced disulfide bonds in hair via the thiol-Michael click reaction, by using a symmetric Michael reagent. - METHODS : Virgin black Chinese hair was reduced using 8% wt thioglycolic acid and employed as model hair containing a high content of broken disulfide bonds. The reduced hair was treated with 1,4-n-butylene dimaleate. Raman spectroscopy and Fourier transform infrared spectroscopy (FT-IR) were used to verify the chemical changes occurred in untreated and treated hair fibre. Single-fibre mechanical properties and thermal properties of the hair were evaluated using tensile testing and differential scanning calorimetry (DSC), respectively. - RESULTS : The 1,4-n-butylene dimaleate could reconnect free thiol groups generated by disulfide bond reduction via thiol-Michael click reaction and significantly improve the mechanical strength of hair compared to that of the reduced hair. Secondary conformational resolution analysis of FT-IR results revealed that the content of α-helix structure could be restored after treatment with 1,4-n-butylene dimaleate. The intermolecular forces established by the newly generated C-S bonds compensate the broken disulfide bonds and enhance the fracture strength of the hair compared to that of reduced hair. Michael reagents of similar structure also showed similar performance in restoring the mechanical properties of reduced hair. - CONCLUSIONS : Our data suggest that 1,4-n-butylene dimaleate can restore the mechanical properties of reduced hair by reconnecting reduced disulfide bonds and restoring the secondary conformation of hair keratin. Note de contenu : - MATERIALS AND METHODS : Reagents - Synthesis of 1,4-n-butylene dimaleate - Hair samples - Hair tensile property tests - Fluorescence microscopy characterization of free thiol groups - Characterization of hair - RESULTS AND DISCUSSION : Click reaction of free thiol groups in hair - Restoration of mechanical properties of reduced hair - Effect of different treatments on the thermal properties of hair - Evidence of the ability of 1,4-n-butylene dimaleate to restore the disrupted secondary conformation of reduced hair keratin - Restorative performance of alkylene dimaletates with different carbon chain lengths to that of 1,4-n-butylene dimaleate DOI : https://doi.org/10.1111/ics.12944 En ligne : https://drive.google.com/file/d/1zZm-Vh22Gbs3x-QX1AuXSjUWukCVcve6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41346 [article]

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