Bio-based polyurethane prepared from Kraft lignin and modified castor oil

Current challenges highlight the need for polymer research using renewable natural sources as a substitute for petroleum-based polymers. The use of polyols obtained from renewable sources combined with the reuse of industrial residues such as lignin is an important agent in this process. Different c...

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Bibliographic Details
Published inExpress polymer letters Vol. 10; no. 11; pp. 927 - 940
Main Authors Tavares, L. B., Boas, C. V., Schleder, G. R., Nacas, A. M., Rosa, D. S., Santos, D. J.
Format Journal Article
LanguageEnglish
Published Budapest Budapest University of Technology and Economics, Faculty of Mechanical Engineering, Department of Polymer Engineering 01.11.2016
Budapest University of Technology
Subjects
Brittleness
Castor oil
Crosslinking
Diphenyl methane diisocyanate
Ductile-brittle transition
Elastic properties
Fourier transforms
Glass transition temperature
Glycerol
Kraft lignin
Lignin
Lignopolyurethane materials
Mechanical properties
Modified castor oil
Modulus of elasticity
Petroleum
Photomicrographs
Polymers
Polyols
Polyurethane resins
Reinforcements
Tensile stress
Tensile tests
Thermogravimetric analysis
Vegetable oils
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Summary:Current challenges highlight the need for polymer research using renewable natural sources as a substitute for petroleum-based polymers. The use of polyols obtained from renewable sources combined with the reuse of industrial residues such as lignin is an important agent in this process. Different compositions of polyurethane-type materials were prepared by combining technical Kraft lignin (TKL) with castor oil (CO) or modified castor oil (MCO1 and MCO2) to increase their reactivity towards diphenylmethane diisocyanate (MDI). The results indicate that lignin increases the glass transition temperature, the crosslinking density and improves the ultimate stress especially for those prepared from MCO2 and 30% lignin content from 8.2 MPa (lignin free) to 23.5 MPa. Scanning electron microscopy (SEM) micrographs of rupture surface after uniaxial tensile tests show ductile-to-brittle transition. The results show the possibility to develop polyurethane-type materials, varying technical grade Kraft lignin content, which cover a wide range of mechanical properties (from large elastic/low Young modulus to brittle/high Young modulus polyurethanes).
ISSN:1788-618X
1788-618X
DOI:10.3144/expresspolymlett.2016.86