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Polyurethane adhesive from lignin esterified with ricinoleic acid: relation between molecular organization and macroscopic properties

Grant number: 19/05460-6
Support type:Scholarships in Brazil - Doctorate (Direct)
Effective date (Start): June 01, 2019
Effective date (End): May 31, 2023
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal researcher:Demetrio Jackson dos Santos
Grantee:Leonardo Dalseno Antonino
Home Institution: Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas (CECS). Universidade Federal do ABC (UFABC). Ministério da Educação (Brasil). Santo André , SP, Brazil


The use of Kraft lignin in the development of polyurethanes (PU) has been widely explored in recent decades. Modification and optimization routes of lignin structure at high temperatures and pressure, such as oxypropylation, were established in the 1980s. Recently, milder synthesis conditions have been reported by reacting lignin with propylene carbonate or even with propylene oxide (OP). In general, polyols from oxypropylated lignin have been widely used in the development of rigid PU foams, but the application of this type of polyol as adhesives is still scarce. The amount of PU information from lignin modified by the reaction with propylene carbonate is even lower, so far no work has reported the obtainment of PU from this polyol. This work proposes the modification of the lignin for application as a polyol, through the esterification of this biopolymer with ricinoleic acid. The objective is to obtain polyols with controlled, optimized and reproducible structures, capable of being developed under mild synthetic conditions. The obtained polyols will be compared with lignins modified through the above-mentioned conventional routes. Subsequently, the polyurethanes will be obtained from these polyols and applied as adhesives. An innovative technique for the characterization of phase transitions, Temperature Modulated Optical Refractometry (TMOR), will be applied in the investigation of the curing kinetics of polyurethanes, as well as in establishing a relationship between the molecular organization of these polymers and their macroscopic properties. The mentioned objective will be achieved by combining TMOR with techniques such as Nuclear Magnetic Resonance (NMR), dielectric spectroscopy, Atomic Force Microscopy (AFM), mechanical tests and Fourier Transform Infrared spectroscopy (FTIR). (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
GOUVEIA, JULIA R.; GARCIA, GUILHERME E. S.; ANTONINO, LEONARDO DALSENO; TAVARES, LARA B.; DOS SANTOS, DEMETRIO J. Epoxidation of Kraft Lignin as a Tool for Improving the Mechanical Properties of Epoxy Adhesive. Molecules, v. 25, n. 11 JUN 2020. Web of Science Citations: 1.
GOUVEIA, JULIA R.; ANTONINO, LEONARDO D.; GARCIA, GUILHERME E. S.; TAVARES, LARA BASILIO; SANTOS, AMANDA N. B.; DOS SANTOS, DEMETRIO J. Kraft lignin-containing polyurethane adhesives: the role of hydroxypropylation on thermomechanical properties. JOURNAL OF ADHESION, JUN 2020. Web of Science Citations: 0.

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