DWARF-GREEN COCONUT FIBERS: A VERSATILE NATURAL RENEWABLE RAW BIORESOURCE. TREATMENT, MORPHOLOGY, AND PHYSICOCHEMICAL PROPERTIES
Dwarf-green coconut fibers were modified by alkali treatment and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), as well as thermogravimetric (TGA), mechanical, and dielectric analyses. Changes in composition, structure,...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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North Carolina State University
2010-11-01
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| Series: | BioResources |
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| Online Access: | http://www.ncsu.edu/bioresources/BioRes_05/BioRes_05_4_2478_Esmeraldo_GFFSCMMM_Dwarf_Green_Coconut_Props_1018.pdf |
| _version_ | 1818427349297790976 |
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| author | Milena A. Esmeraldo Antonio C. Gomes Jose E. B. Freitas Pierre B. A. Fechine Antonio S. B. Sombra Elisangela Corradini Giuseppe Mele Alfonso Maffezzoli Selma E. Mazzetto |
| author_facet | Milena A. Esmeraldo Antonio C. Gomes Jose E. B. Freitas Pierre B. A. Fechine Antonio S. B. Sombra Elisangela Corradini Giuseppe Mele Alfonso Maffezzoli Selma E. Mazzetto |
| author_sort | Milena A. Esmeraldo |
| collection | DOAJ |
| description | Dwarf-green coconut fibers were modified by alkali treatment and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), as well as thermogravimetric (TGA), mechanical, and dielectric analyses. Changes in composition, structure, and morphology of the coconut fibers were observed after sodium hydroxide treatments due to the removal of lignin, hemicellulose, and other impurities. The XRD data were in agreement with the morphological analysis, where the crystallinity fraction increased with the concentration of alkali solution and fell off above 10%. The infrared spectrometry showed the partial dissolution of hemicellulose, lignin, and pectin, which was clearly identified by the band at 1736 cm-1. Thermogravimetric analysis showed a double degradation process for the untreated dwarf-green coconut fibers, while a single one was observed after the pretreatment. The tensile properties showed an increased elongation at break, modulus, and strength, and the dielectric results showed a decrease of all parameters (permittivity, dielectric loss, and conductivity), reflecting the reduced dipole and ion mobility associated with the loss of amorphous components. |
| first_indexed | 2024-12-14T14:44:19Z |
| format | Article |
| id | doaj.art-a96dc7b7f6984d0ba43ed1e19f99abae |
| institution | Directory Open Access Journal |
| issn | 1930-2126 |
| language | English |
| last_indexed | 2024-12-14T14:44:19Z |
| publishDate | 2010-11-01 |
| publisher | North Carolina State University |
| record_format | Article |
| series | BioResources |
| spelling | doaj.art-a96dc7b7f6984d0ba43ed1e19f99abae2022-12-21T22:57:20ZengNorth Carolina State UniversityBioResources1930-21262010-11-015424782501DWARF-GREEN COCONUT FIBERS: A VERSATILE NATURAL RENEWABLE RAW BIORESOURCE. TREATMENT, MORPHOLOGY, AND PHYSICOCHEMICAL PROPERTIESMilena A. EsmeraldoAntonio C. GomesJose E. B. FreitasPierre B. A. FechineAntonio S. B. SombraElisangela CorradiniGiuseppe MeleAlfonso MaffezzoliSelma E. MazzettoDwarf-green coconut fibers were modified by alkali treatment and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), as well as thermogravimetric (TGA), mechanical, and dielectric analyses. Changes in composition, structure, and morphology of the coconut fibers were observed after sodium hydroxide treatments due to the removal of lignin, hemicellulose, and other impurities. The XRD data were in agreement with the morphological analysis, where the crystallinity fraction increased with the concentration of alkali solution and fell off above 10%. The infrared spectrometry showed the partial dissolution of hemicellulose, lignin, and pectin, which was clearly identified by the band at 1736 cm-1. Thermogravimetric analysis showed a double degradation process for the untreated dwarf-green coconut fibers, while a single one was observed after the pretreatment. The tensile properties showed an increased elongation at break, modulus, and strength, and the dielectric results showed a decrease of all parameters (permittivity, dielectric loss, and conductivity), reflecting the reduced dipole and ion mobility associated with the loss of amorphous components.www.ncsu.edu/bioresources/BioRes_05/BioRes_05_4_2478_Esmeraldo_GFFSCMMM_Dwarf_Green_Coconut_Props_1018.pdfDwarf-green coir fibersSurface pretreatmentMorphologyPhysicochemical and mechanical properties |
| spellingShingle | Milena A. Esmeraldo Antonio C. Gomes Jose E. B. Freitas Pierre B. A. Fechine Antonio S. B. Sombra Elisangela Corradini Giuseppe Mele Alfonso Maffezzoli Selma E. Mazzetto DWARF-GREEN COCONUT FIBERS: A VERSATILE NATURAL RENEWABLE RAW BIORESOURCE. TREATMENT, MORPHOLOGY, AND PHYSICOCHEMICAL PROPERTIES BioResources Dwarf-green coir fibers Surface pretreatment Morphology Physicochemical and mechanical properties |
| title | DWARF-GREEN COCONUT FIBERS: A VERSATILE NATURAL RENEWABLE RAW BIORESOURCE. TREATMENT, MORPHOLOGY, AND PHYSICOCHEMICAL PROPERTIES |
| title_full | DWARF-GREEN COCONUT FIBERS: A VERSATILE NATURAL RENEWABLE RAW BIORESOURCE. TREATMENT, MORPHOLOGY, AND PHYSICOCHEMICAL PROPERTIES |
| title_fullStr | DWARF-GREEN COCONUT FIBERS: A VERSATILE NATURAL RENEWABLE RAW BIORESOURCE. TREATMENT, MORPHOLOGY, AND PHYSICOCHEMICAL PROPERTIES |
| title_full_unstemmed | DWARF-GREEN COCONUT FIBERS: A VERSATILE NATURAL RENEWABLE RAW BIORESOURCE. TREATMENT, MORPHOLOGY, AND PHYSICOCHEMICAL PROPERTIES |
| title_short | DWARF-GREEN COCONUT FIBERS: A VERSATILE NATURAL RENEWABLE RAW BIORESOURCE. TREATMENT, MORPHOLOGY, AND PHYSICOCHEMICAL PROPERTIES |
| title_sort | dwarf green coconut fibers a versatile natural renewable raw bioresource treatment morphology and physicochemical properties |
| topic | Dwarf-green coir fibers Surface pretreatment Morphology Physicochemical and mechanical properties |
| url | http://www.ncsu.edu/bioresources/BioRes_05/BioRes_05_4_2478_Esmeraldo_GFFSCMMM_Dwarf_Green_Coconut_Props_1018.pdf |
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