Thermal and mechanical properties of coconut shell lignin-based polyurethanes synthesized by solvent-free polymerization

In the present work, polyurethanes were synthesized through a three-component system formed by coconut shell ethanosolv lignin (CSEL), polyethylene glycol 400 and toluene diisocyanate (TDI), through a solvent-free polymerization route. The effects of CSEL content and [NCO]/[OH] ratio used in the for...

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Bibliographic Details
Published in:Journal of materials science 2018, Vol.53 (2), p.1470-1486
Main Authors: Avelino, Francisco, Almeida, Sady Lobo, Duarte, Eden Batista, Sousa, Juliana Rabelo, Mazzetto, Selma Elaine, de Souza Filho, Men de Sá Moreira
Format: Article
Language:English
Subjects:
Analysis
Characterization and Evaluation of Materials
Chemical synthesis
Chemistry and Materials Science
Classical Mechanics
Crosslinking
Crystallography and Scattering Methods
Formulations
Glass transition temperature
Isocyanates
Lignin
Materials Science
Mechanical properties
Polyethylene glycol
Polymer crosslinking
Polymer Sciences
Polymerization
Polymers
Polyols
Polyurethane resins
Polyurethanes
Porosity
Solid Mechanics
Solvents
Thermodynamic properties
Toluene
Toluene diisocyanates
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Summary:In the present work, polyurethanes were synthesized through a three-component system formed by coconut shell ethanosolv lignin (CSEL), polyethylene glycol 400 and toluene diisocyanate (TDI), through a solvent-free polymerization route. The effects of CSEL content and [NCO]/[OH] ratio used in the formulations in a range from 0 to 50% w/w and 1.0–1.5, respectively, on properties such as porosity and crosslinking degree of PUs were investigated. For this purpose, four formulations with increasing CSEL content were chosen to evaluate the effect of its insertion on the structural, morphological, thermal and mechanical properties of these PUs. The CSEL-based PUs presented higher thermal and thermo-oxidative stability in relation to the PU without CSEL. Moreover, an increase in glass transition temperature ( T g ) was observed as the CSEL content in the PU formulations increased, suggesting that the addition of lignin caused an increase in the crosslinking degrees of the obtained materials. However, high lignin contents produced PUs with poor mechanical properties, while intermediate lignin contents produced materials with interesting mechanical properties.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-017-1562-z