Effects of NCO:OH ratio on the mechanical properties and chemical structure of Kraft lignin–based polyurethane adhesive

Nacas, Amanda Martins; Ito, Nathalie Minako; Sousa, Rogério Ramos de; Spinacé, Márcia A. S.; Santos, Demétrio Jackson dos

doi:10.1080/00218464.2016.1177793

Cited by 58 publications

(41 citation statements)

References 33 publications

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“…Furthermore, due to the prevalence of bulky fragments in lignin, isocyanate groups do not react with all of the OH groups of lignin. For these reasons, the greatest success has been observed when the NCO/OH ratio is high, generally ≥1.0 mol NCO/mol hydroxyl [11]. Another strategy to increase coupling to lignin particles is to modify lignin to increase its solubility and to increase the number of aliphatic OH groups available for reaction.…”

Section: Lignin Derivatives For Polyurethane Synthesismentioning

confidence: 99%

“…When kraft lignin was reacted in MeTHF with toluene diisocyanate (TDI) as the crosslinker, a maximum adhesive strength (3.70 GPa) was achieved with a NCO/OH ratio of 1.3 and contained 70 wt.% lignin [13]. Another approach to lignin polyurethane adhesives allows reaction of technical-grade kraft lignin with MDI in THF [11]. These adhesives displayed reasonable performance for binding wood surfaces, with a maximum lap shear strength of 6.3 MPa achieved at a 1.2 NCO/OH ratio.…”

Section: Polyurethanes Prepared From Unmodified Ligninmentioning

confidence: 99%

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Valorization of Lignin as a Sustainable Component of Structural Materials and Composites: Advances from 2011 to 2019

Karunarathna

Smith

2020

Sustainability

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Lignin is the most abundant aromatic biopolymer and is the sustainable feedstock most likely to supplant petroleum-derived aromatics and downstream products. Rich in functional groups, lignin is largely peerless in its potential for chemical modification towards attaining target properties. Lignin’s crosslinked network structure can be exploited in composites to endow them with remarkable strength, as exemplified in timber and other structural elements of plants. Yet lignin may also be depolymerized, modified, or blended with other polymers. This review focuses on substituting petrochemicals with lignin derivatives, with a particular focus on applications more significant in terms of potential commercialization volume, including polyurethane, phenol-formaldehyde resins, lignin-based carbon fibers, and emergent melt-processable waste-derived materials. This review will illuminate advances from the last eight years in the prospective utilization of such lignin-derived products in a range of application such as adhesives, plastics, automotive components, construction materials, and composites. Particular technical issues associated with lignin processing and emerging alternatives for future developments are discussed.

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Section: Lignin Derivatives For Polyurethane Synthesismentioning

confidence: 99%

Section: Polyurethanes Prepared From Unmodified Ligninmentioning

confidence: 99%

Valorization of Lignin as a Sustainable Component of Structural Materials and Composites: Advances from 2011 to 2019

Karunarathna

Smith

2020

Sustainability

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“…9). 42 FTIR spectroscopy results conrmed literature data for kra lignins isolated via acidic precipitation (Fig. 10).…”

Section: Characterization Of Kra Lignin Isolated At Different Phmentioning

confidence: 99%

Unmodified kraft lignin isolated at room temperature from aqueous solution for preparation of highly flexible transparent polyurethane coatings

et al. 2018

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“…Lignin-phenol-formaldehyde resin adhesives with 10% -60% substitution rates and low residual toxicity were successfully synthesized. These results indicate that the lignin-phenol-formaldehyde resin adhesives synthesized using the designed formulation could effectively [82].…”

Section: Lignin As Reactive Raw Materialsmentioning

confidence: 77%

Lignin: Renewable Raw Material for Adhesive

Gadhave¹,

Srivastava²,

Mahanwar³

et al. 2019

OJPChem

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Biobased raw material like lignin used during manufacturing of wood and wood composite adhesive have been used extensively to replaced petro-chemical based adhesive because of their easy availability, low cost and biodegradability. Bio-based resources, such as lignin which is an abundant, constitute a rich source of hydroxyl functionality which is being considered as reactive raw material for the production of "adhesives". Lignin is mainly used for production of wood and wood composite adhesives by blending with soy protein, grafting with another polymer and reacting with isocynates. In this review, lignin as suitable alternative raw material to conventional petroleum sourced materials used as a raw material for adhesives is discussed.

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Effects of NCO:OH ratio on the mechanical properties and chemical structure of Kraft lignin–based polyurethane adhesive

Cited by 58 publications

References 33 publications

Valorization of Lignin as a Sustainable Component of Structural Materials and Composites: Advances from 2011 to 2019

Valorization of Lignin as a Sustainable Component of Structural Materials and Composites: Advances from 2011 to 2019

Unmodified kraft lignin isolated at room temperature from aqueous solution for preparation of highly flexible transparent polyurethane coatings

Lignin: Renewable Raw Material for Adhesive

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