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Open Access Cardanol-Based Polyurethane Coatings via Click Chemistry: An Eco-friendly Approach

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This research work discloses the preparation of polyurethane coatings from cardanol modified using thiolene chemistry, wherein unsaturated long alkyl chain of cardanol was successfully utilized via thiol-ene click reaction to synthesize polyol. For this purpose, cardanol and thioglycerol was reacted in the presence of Irgacure 184 (photoinitiator) and 1,8-Diazabicyclo[5.4.0]undec-7-ene (catalyst) and exposed to UV light for 12 h at 80 °C. One mole of thioglycerol was successfully added across the double bond of fatty chain of cardanol and confirmed by chemical and spectroscopic analysis. Further, the polyol thus prepared was cured with various polyisocyanates, viz., N-75 (HDI based), L-67/BA (TDI based), Z-4470 (IPDI based) and corresponding polyurethane coatings were developed. The coatings were then analyzed for mechanical, chemical, optical, thermal and anticorrosive properties. It was observed that cardanol-based PU coatings exhibited excellent mechanical, chemical and thermal and anticorrosive properties as compared to that of commercial acrylic-PU coatings.
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Keywords: ANTICORROSIVE; CLICK CHEMISTRY; POLYURETHANE; THIOL-ENE; ULTRAVIOLET LIGHT

Document Type: Research Article

Publication date: 01 August 2018

This article was made available online on 20 March 2018 as a Fast Track article with title: "Cardanol-Based Polyurethane Coatings via Click Chemistry: An Eco-friendly Approach".

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  • This journal publishes high quality peer reviewed original research and review articles on macromolecules and additives obtained from renewable/biobased resources. Utilizing a multidisciplinary approach, JRM introduces cutting-edge research on biobased monomers, polymers, additives (both organic and inorganic), their blends and composites. JRM showcases both fundamental aspects and applications of renewable materials. The fundamental topics include the synthesis and polymerization of biobased monomers and macromonomers, the chemical modification of natural polymers, as well as the characterization, structure-property relationships, processing, recycling, bio and environmental degradation and life cycle analysis of the ensuing materials, in view of their potential applications. Within this sustainability approach, green chemistry processes and studies falling within biorefinery contexts are strongly favored.
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