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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| Format: | Article |
| Language: | English |
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Budapest University of Technology and Economics
2016-11-01
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| Series: | eXPRESS Polymer Letters |
| Subjects: | |
| Online Access: | http://www.expresspolymlett.com/letolt.php?file=EPL-0007327&mi=cd |
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| author | L. B. Tavares C. V. Boas G. R. Schleder A. M. Nacas D. S. Rosa D. J. Santos |
| author_facet | L. B. Tavares C. V. Boas G. R. Schleder A. M. Nacas D. S. Rosa D. J. Santos |
| author_sort | L. B. Tavares |
| collection | DOAJ |
| description | 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). |
| format | Article |
| id | doaj-art-22c4b7b4172d4e23a0c42e4dd066cc31 |
| institution | Kabale University |
| issn | 1788-618X |
| language | English |
| publishDate | 2016-11-01 |
| publisher | Budapest University of Technology and Economics |
| record_format | Article |
| series | eXPRESS Polymer Letters |
| spelling | doaj-art-22c4b7b4172d4e23a0c42e4dd066cc312025-08-20T03:32:36ZengBudapest University of Technology and EconomicseXPRESS Polymer Letters1788-618X2016-11-01101192794010.3144/expresspolymlett.2016.86Bio-based polyurethane prepared from Kraft lignin and modified castor oilL. B. TavaresC. V. BoasG. R. SchlederA. M. NacasD. S. RosaD. J. SantosCurrent 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).http://www.expresspolymlett.com/letolt.php?file=EPL-0007327&mi=cdReinforcementsMechanical propertiesKraft ligninLignopolyurethane materialsModified castor oil |
| spellingShingle | L. B. Tavares C. V. Boas G. R. Schleder A. M. Nacas D. S. Rosa D. J. Santos Bio-based polyurethane prepared from Kraft lignin and modified castor oil eXPRESS Polymer Letters Reinforcements Mechanical properties Kraft lignin Lignopolyurethane materials Modified castor oil |
| title | Bio-based polyurethane prepared from Kraft lignin and modified castor oil |
| title_full | Bio-based polyurethane prepared from Kraft lignin and modified castor oil |
| title_fullStr | Bio-based polyurethane prepared from Kraft lignin and modified castor oil |
| title_full_unstemmed | Bio-based polyurethane prepared from Kraft lignin and modified castor oil |
| title_short | Bio-based polyurethane prepared from Kraft lignin and modified castor oil |
| title_sort | bio based polyurethane prepared from kraft lignin and modified castor oil |
| topic | Reinforcements Mechanical properties Kraft lignin Lignopolyurethane materials Modified castor oil |
| url | http://www.expresspolymlett.com/letolt.php?file=EPL-0007327&mi=cd |
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