Lignin-based polyurethane and epoxy adhesives: a short review

• Autorzy: dos Santos D.J. , Tavares L.B. , Gouveia J.R. , Batalha G.F.

Identyfikatory

DOI

10.5604/01.3001.0015.0242

• Języki publikacji: EN

Abstrakty

EN

Purpose: of this paper was to review and summarize significant papers related to the development and characterization of lignin-containing adhesives: polyurethane and epoxy types. In the last decades, several efforts have been dedicated on the development of renewable raw materials for polymer synthesis, mainly due to petroleum depletion and sustainability. In this context, lignin emerged as a potential candidate to substitute fossil-based raw materials in adhesive synthesis and formulations. Design/methodology/approach: Recent and other relevant papers were reviewed, aiming to identify the main advantages and limitations involved in lignin incorporation into epoxy and polyurethane adhesives formulations. First, effects of unmodified lignin addition were presented. Afterwards, the main lignin chemical modification methods were presented and discussed, based on thermomechanical results. Findings: Incorporation of unmodified lignin usually is limited to 30 %wt., otherwise mechanical properties are drastically affected as consequence of poor lignin solubility and excessive brittleness. Lignin chemical modification can be used to increase the reactivity of hydroxyl groups and/or add new moieties in its molecular structure, improving solubility and thermomechanical properties of cured adhesives. Practical implications: In the last years, some industrial plants started to operate and produce technical grade lignin at industrial scale, with reproducible properties and controlled molecular structure. Therefore, increasing efforts have been dedicated from researchers and chemists to develop lignin-based technologies, in which this work can directly contribute with. Originality/value: As consequence of the high content of phenol groups in its molecular structure, lignin was mostly applied on the development of phenolic resins applied as wood adhesives. For the first time in the literature, this work summarizes the advances related to synthesis and characterization of polyurethane and epoxy, applied as adhesives. Results can support the development and application of biobased, as well as contribute to the revalorization of this valuable and readily available biomass.

Słowa kluczowe

EN

engineering polymers; adhesives; polyurethane; lignin

PL

polimery inżynieryjne; kleje; poliuretan; lignina

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2021
• Tom: Vol. 107, nr 2
• Strony: 56--63
• Opis fizyczny: Bibliogr. 34 poz.

Twórcy

autor

dos Santos D.J.

• Modelling and Applied Social Sciences Centre, ABC Federal University, Santo Andre, Brazil

• https://orcid.org/0000-0002-4707-2285

autor

Tavares L.B.

• Modelling and Applied Social Sciences Centre, ABC Federal University, Santo Andre, Brazil

autor

Gouveia J.R.

• Modelling and Applied Social Sciences Centre, ABC Federal University, Santo Andre, Brazil

autor

Batalha G.F.

• Department of Mechatronics and Mechanical Engineering, Polytechnic School of Engineering, University of São Paulo, São Paulo, Brazil

Bibliografia

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