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Open Access Biobased Aromatic-Aliphatic Polyols from Cardanol by Thermal Thiol-Ene Reaction

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This article is Open Access under the terms of the Creative Commons CC BY licence.

Cardanol is a natural phenol which is obtained from high vacuum distillation of cashew nut shell liquid. It contains a hydrocarbon chain of 15 carbon atoms in the meta position, either with one, two or three non-conjugated double bonds. This article describes thermal thiol-ene reaction to synthesize new cardanol-based polyols for polyurethanes with aromatic-aliphatic structure. Phenolic hydroxyl group was blocked by alkoxylation and 2-mercaptoethanol was added to the double bonds of propoxylated cardanol. The resultant product is a mixture of polyols that may contain one, two, three or four hydroxyl groups, as a function of the number of double bonds reacted with 2-mercaptoethanol. Similar polyols, but with much higher functionality, were also synthesized from condensation of cardanol-based novolacs with formaldehyde. These cardanolbased polyols were further utilized to prepare rigid polyurethane foams (PUs) with excellent physical and mechanical properties, useful for various applications in chemical and food industries.
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Keywords: CASHEW NUT SHELL LIQUID; MERCAPTANS; POLYURETHANES; THIOL-ENE

Document Type: Research Article

Publication date: January 1, 2018

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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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