Synthesis of lignin polyols via oxyalkylation with propylene carbonate

Autor:	Isabell Kühnel, Bodo Saake, Ralph Lehnen, Jacob Podschun
Rok vydání:	2014
Předmět:	chemistry.chemical_classification Materials science Carboxylic acid Organosolv Maleic anhydride Nuclear magnetic resonance spectroscopy Carbon-13 NMR Biomaterials chemistry.chemical_compound chemistry Polyol Polymer chemistry Propylene carbonate Organic chemistry Lignin
Zdroj:	Holzforschung. 69:531-538
ISSN:	1437-434X 0018-3830
DOI:	10.1515/hf-2014-0068
Popis:	An efficient, nontoxic, and solvent-free oxyalkylation of European beech wood organosolv lignin (OL) has been developed. Two approaches were studied: a direct reaction of lignin with propylene carbonate (PC) and a two-step reaction of lignin with maleic anhydride (MA) followed by oxyalkylation with PC. The structural analysis of lignin polyols was performed by 1H NMR, 13C NMR, 31P NMR, and FTIR spectroscopy. It was demonstrated that PC was able to almost completely oxypropylate aliphatic and phenolic OH groups. Moreover, the carboxylic acid groups of maleated OL were fully oxypropylated by PC. This modification strongly facilitates the generation of a uniform lignin polyol applicable as a biobased component in polyurethanes and polyesters based on cyclic organic carbonates.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fc26bacc39587470829d55c9d1e52606 https://doi.org/10.1515/hf-2014-0068 Zobrazit plný text záznamu