Hemicellulose Removal in Curaua (Ananas erectifolius) Fibers for Polyester Composites
Introduction: Alkaline treatments extract hemicellulose from the fibers, which can be reused in the manufacture of other materials, and the cellulosic portion can be applied as reinforcement in a composite. This way, all components of the fibers are utilized. Method: In this work, curaua fibers (An...
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| Format: | Article |
| Language: | English |
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Universidad De La Salle Bajío
2018-09-01
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| Series: | Nova Scientia |
| Subjects: | |
| Online Access: | http://novascientia.delasalle.edu.mx/ojs/index.php/Nova/article/view/1509 |
| _version_ | 1819292181547974656 |
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| author | Beatriz S. Rodrígues Rafael M. García Rosineide M. Leão Sandro C. Amico Sandra María Luz |
| author_facet | Beatriz S. Rodrígues Rafael M. García Rosineide M. Leão Sandro C. Amico Sandra María Luz |
| author_sort | Beatriz S. Rodrígues |
| collection | DOAJ |
| description | Introduction: Alkaline treatments extract hemicellulose from the fibers, which can be reused in the manufacture of other materials, and the cellulosic portion can be applied as reinforcement in a composite. This way, all components of the fibers are utilized.
Method: In this work, curaua fibers (Ananas erectifolius) were treated with potassium hydroxide (KOH) to solubilize part of the hemicellulose and lignin, and the cellulose-rich fibers were used to manufacture composites with unsaturated polyester, which were characterized to investigate the effect of the treatment on their properties.
Results: The alkaline treatment removed large portions of hemicellulose and significantly degraded the crystalline cellulose and lignin, resulting in a small increase (2.4%) in overall crystallinity and with a negative impact on their thermal stability. SEM images showed defibrillation of the treated fiber and fibril separation, increasing roughness and surface contact area.
Conclusions: In all, although the alkaline treatment substantially modified the fibers and no significant changes were observed in the mechanical properties of the composite, the total removal of hemicellulose was found to affect the integrity of cellulose fibers making harder their application as reinforcement. However, the higher cellulose content could be useful for other applications. |
| first_indexed | 2024-12-24T03:50:27Z |
| format | Article |
| id | doaj.art-2c75b88e0e6a46d3a90e557da0770648 |
| institution | Directory Open Access Journal |
| issn | 2007-0705 |
| language | English |
| last_indexed | 2024-12-24T03:50:27Z |
| publishDate | 2018-09-01 |
| publisher | Universidad De La Salle Bajío |
| record_format | Article |
| series | Nova Scientia |
| spelling | doaj.art-2c75b88e0e6a46d3a90e557da07706482022-12-21T17:16:35ZengUniversidad De La Salle BajíoNova Scientia2007-07052018-09-011021Hemicellulose Removal in Curaua (Ananas erectifolius) Fibers for Polyester CompositesBeatriz S. Rodrígues0Rafael M. García1Rosineide M. Leão2Sandro C. Amico3Sandra María Luz4Universidade de BrasíliaUniversidade de BrasíliaFaculdades Integradas da União Educacional do Planalto CentralUniversidade Federal do Rio Grande do SulUniversidade de BrasíliaIntroduction: Alkaline treatments extract hemicellulose from the fibers, which can be reused in the manufacture of other materials, and the cellulosic portion can be applied as reinforcement in a composite. This way, all components of the fibers are utilized. Method: In this work, curaua fibers (Ananas erectifolius) were treated with potassium hydroxide (KOH) to solubilize part of the hemicellulose and lignin, and the cellulose-rich fibers were used to manufacture composites with unsaturated polyester, which were characterized to investigate the effect of the treatment on their properties. Results: The alkaline treatment removed large portions of hemicellulose and significantly degraded the crystalline cellulose and lignin, resulting in a small increase (2.4%) in overall crystallinity and with a negative impact on their thermal stability. SEM images showed defibrillation of the treated fiber and fibril separation, increasing roughness and surface contact area. Conclusions: In all, although the alkaline treatment substantially modified the fibers and no significant changes were observed in the mechanical properties of the composite, the total removal of hemicellulose was found to affect the integrity of cellulose fibers making harder their application as reinforcement. However, the higher cellulose content could be useful for other applications.http://novascientia.delasalle.edu.mx/ojs/index.php/Nova/article/view/1509compositespolyesternatural fiberscurauaalkaline treatment |
| spellingShingle | Beatriz S. Rodrígues Rafael M. García Rosineide M. Leão Sandro C. Amico Sandra María Luz Hemicellulose Removal in Curaua (Ananas erectifolius) Fibers for Polyester Composites Nova Scientia composites polyester natural fibers curaua alkaline treatment |
| title | Hemicellulose Removal in Curaua (Ananas erectifolius) Fibers for Polyester Composites |
| title_full | Hemicellulose Removal in Curaua (Ananas erectifolius) Fibers for Polyester Composites |
| title_fullStr | Hemicellulose Removal in Curaua (Ananas erectifolius) Fibers for Polyester Composites |
| title_full_unstemmed | Hemicellulose Removal in Curaua (Ananas erectifolius) Fibers for Polyester Composites |
| title_short | Hemicellulose Removal in Curaua (Ananas erectifolius) Fibers for Polyester Composites |
| title_sort | hemicellulose removal in curaua ananas erectifolius fibers for polyester composites |
| topic | composites polyester natural fibers curaua alkaline treatment |
| url | http://novascientia.delasalle.edu.mx/ojs/index.php/Nova/article/view/1509 |
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