Bio-based reactive diluent derived from cardanol and its application in polyurethane acrylate (PUA) coatings with high performance / Yun Hu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 499-509 Titre : Bio-based reactive diluent derived from cardanol and its application in polyurethane acrylate (PUA) coatings with high performance Type de document : texte imprimé Auteurs : Yun Hu, Auteur ; Guodong Feng, Auteur ; Qianqian Shang, Auteur ; Caiying Bo, Auteur ; Puyou Jia, Auteur ; Chengguo Liu, Auteur ; Feng Xu, Auteur ; Yonghong Zhou, Auteur Année de publication : 2019 Article en page(s) : p. 499-509 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomatériaux Caractérisation Cardanol Chimie -- Essais et réactifs Copolymère uréthane acrylate Diluants Huile de ricin et constituants Polymères hautes performances Revêtements -- Propriétés mécaniques Revêtements -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : A UV-curable cardanol-based monomer (ECGE) was prepared using cardanol and epichlorohydrin, followed by epoxidation of the unsaturation in alkyl side chains of cardanol segments. After its chemical structure was confirmed by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance (1H NMR), ECGE was used as a reactive diluent to copolymerize with castor oil-based polyurethane acrylate (PUA) and a series of UV-curable coatings were prepared. Results showed that the viscosity and volume shrinkage of the UV-curable PUA system decreased significantly after the introduction of cardanol-based monomer while maintaining reasonably high bio-renewable contents; when containing 50% of ECGE, the biomass content reaches 66.2%, which is 1.41 times that of pure resin. In addition, the coating properties were evaluated to determine hardness, adhesion, flexibility, and water resistance. The properties of UV-curable thermoset were also studied using tensile testing, dynamic mechanical thermal analysis, and thermogravimetric analysis. The cardanol-based coatings showed excellent adhesion, flexibility, medium hardness, and enhanced char yield although tensile strength, tensile modulus and glass transition temperatures were somewhat diminished. All these performances can be attributed to the unique architectures of ECGE that combined the structural features of rigid benzene ring and long flexible alkyl chains. The UV-curing behavior was determined using real-time IR, and the results indicated that the conversion of unsaturated bond was increased with more concentration of ECGE. Note de contenu : - MATERIALS - Characterization - Synthesis of epoxidized cardanol glycidyl ether (ECGE) - Preparation of the UV-curable coatings - RESULTS AND DISCUSSION : Structure characterization of ECG - Bio-based content of the UV-curable coatings - Viscosity - UV-curing behaviors of the UV-curable bio-based coatings - Volumetric shrinkage of the UV-curable coatings - Gel contents of the UV-curable coatings - Tensile properties - DMA of the UV-curable bio-based coatings - Thermal properties of the UV-curable bio-based coatings - Coatings properties of the UV-curable bio-based coatings - Proposed dual-curing mechanism DOI : 10.1007/s11998-018-0128-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0128-6 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32420 [article]

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Synthesis and characterization of novel renewable castor oil-based UV-curable polyfunctional polyurethane acrylate / Yun Hu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 1 (01/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 1 (01/2018) . - p. 77–85 Titre : Synthesis and characterization of novel renewable castor oil-based UV-curable polyfunctional polyurethane acrylate Type de document : texte imprimé Auteurs : Yun Hu, Auteur ; Chengguo Liu, Auteur ; Qianqian Shang ; Yonghong Zhou Année de publication : 2018 Article en page(s) : p. 77–85 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique Angle de contact Chromatographie sur gel Copolymère uréthane acrylate Copolymères -- Propriétés thermiques Copolymères -- Synthèse Fourier, Spectroscopie infrarouge à transformée de Gonflement (physique) Huile de ricin et constituants Humidité -- Absorption:Eau -- Absorption Hydrophobie Rayonnement ultraviolet Résonance magnétique nucléaire Réticulation (polymérisation) Index. décimale : 667.9 Revêtements et enduits Résumé : In recent years, a lot of interest has been given to renewable resources for their environmental friendliness and potential biodegradability in the synthesis of urethane-derived polymers. In this work, UV-curable castor oil-based polyfunctional polyurethane acrylate (COPUA) was prepared by the reaction of isophorone diisocyanate (IPDI) with castor oil and pentaerythritol triacrylate (PETA). The structures and molecular weights of the targeted IPDI–PETA and COPUA were characterized by FTIR, 1H NMR, and GPC, respectively. In addition, the effect of reactive diluent content on damping properties, thermal stabilities, and mechanical properties of COPUA was characterized by dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), and universal test machine. DMA revealed the copolymers had a glass transition temperature (T g) from 31.81 to 48.09°C. TGA showed that thermal initial decomposition temperatures were above 344.5°C, indicating the copolymers had certain thermal stability. Finally, some physical properties of curing films were studied by the contact angle and water absorption, and the results showed that the coatings exhibited good hydrophobicity. The COPUA obtained from castor oil can be used as eco-friendly materials and other applications alternative to the use of other petrochemicals in coatings. Note de contenu : - EXPERIMENTAL : Materials - Preparation - Determination of NCO content 24 - Characterization - RESULTS AND DISCUSSION : FTIR analysis - 1H-NMR analysis - GPC analysis - DMA characterization - Thermal properties - Contact angle characterization - Mechanical properties of the COPUA - Swelling measurement of the COPUA - Photocuring kinetics by real-time infrared spectroscopy (RT-IR) DOI : 10.1007/s11998-017-9948-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9948-z.pdf Format de la ressource électronique : pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30069 [article]

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