Polyols and polyurethanes from renewable sources : past, present and future—part 1 : vegetable oils and lignocellulosic biomass / Ritesh S. Malani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 201-222 Titre : Polyols and polyurethanes from renewable sources : past, present and future—part 1 : vegetable oils and lignocellulosic biomass Type de document : texte imprimé Auteurs : Ritesh S. Malani, Auteur ; Vinod C. Malshe, Auteur ; Bhaskar Narayan Thorat, Auteur Année de publication : 2022 Article en page(s) : p. 201-222 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomasse Biopolymères -- Synthèse Huiles et graisses végétales Isocyanates Lignocellulose Polymères -- Recyclage Polyols Polyuréthanes Ressources renouvelables Index. décimale : 667.9 Revêtements et enduits Résumé : Polyurethanes, a major class of polymers conventionally derived from petroleum products, find applications in numerous sectors. Limited fossil resources, their extensive usage, large carbon footprint and alarming environmental issues motivated the research community worldwide in finding alternate and renewable routes for one of the key raw materials, polyols and isocyanate precursors. There are several reports available in the literature showing the techno-economic viability of bio-based polyols and hence polyurethanes. This article summarizes the synthesis of renewable polyols and polyurethanes thereof through utilization of various renewable sources such as vegetable oils, lingo-cellulosic biomass and other feedstock. The polyols obtained from different starting materials lead to variation in hydroxyl number and ultimately have a profound impact on the properties of polyurethanes. Hydroxyl groups are further classified based on their presence in polyols. Primary hydroxyl groups present in polyols hold the mechanical and thermal performance of final polyurethanes better. In this context, the recent advancements in increasing the primary hydroxyl groups in bio-based polyols through different chemical transformation has been focused on here. Moreover, the developments in the synthesis of polyurethane foam without the use of isocyanates have been considered as a green polymer. The ever-increasing demand in the market and the high potential of renewable sources will lead to further advancement in commercialization of bio-based polyurethanes. Note de contenu : - Vegetable oil-derived polyols and polyurethane : Seed oils for PU synthesis having integral hydroxyl group - Seed oils for PU synthesis without hydroxyl group - Biomass-derived polyols and polyurethane : Lignocellulosic polyols from oxypropylation of lignin and corresponding PUs - Polyols from liquefaction of lignocellulosic biomass and corresponding PUs - Reusability and recycling of polyurethanes - Summary and future opportunities DOI : https://doi.org/10.1007/s11998-021-00490-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00490-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37154 [article]

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Polyols and polyurethanes from renewable sources : past, present, and future - part 2 : plant-derived materials / Ritesh S. Malani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 2 (03/2022) . - p. 361-375 Titre : Polyols and polyurethanes from renewable sources : past, present, and future - part 2 : plant-derived materials Type de document : texte imprimé Auteurs : Ritesh S. Malani, Auteur ; Vinod C. Malshe, Auteur ; Bhaskar Narayan Thorat, Auteur Année de publication : 2022 Article en page(s) : p. 361-375 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Glucides Matières premières Polyols Polyuréthanes Protéines Recyclage (déchets, etc.) Ressources renouvelables Index. décimale : 667.9 Revêtements et enduits Résumé : Polyols are basically compounds containing multiple reactive hydroxyl groups and one of the major constituting elements in making polyurethane and polyurethane foam. Traditionally, the polyols are obtained from fossil fuels. The limited availability of fossil fuels and exponentially increasing demand of polymers including PUs enforce the scientific society to explore the possible alternate sources for obtaining polyols. In order to reduce the dependency of polyols on fossil fuels, renewable polyols have gained significant importance over the last few decades. Various biomass and renewable sources have been explored to obtain the polyols. The present review, which is a continuation of our earlier work, highlights various other starting raw materials of plant origin for obtaining the renewable polyols and corresponding methodologies. The review also attempts to make a strong connection between the starting material for making polyols, chemical transformations employed, and the properties of polyols as well as final PUs. The comprehensive analysis of renewable polyols and corresponding PUs will help researchers in making commercially viable renewable polyols to fulfill the increasing demand. Note de contenu : - Carbohydrate-derived polyols and polyurethanes - Starch-derived polyols and polyurethane - Protein-derived polyols and polyurethane - Other plant-derived polyols and polyurethane : Eugenol - Cardanol and CNSL - Terpenes, terpenoids, and rosins - Methanol and ethanol derivatives - Table 1 : Carbohydrate-derived short-chain polyols with basic properties - Table 2 : Alcohol-derived short-chain polyols with basic properties DOI : https://doi.org/10.1007/s11998-021-00534-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00534-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37267 [article]

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