Influence of pretreatment on mechanical and dielectric properties of short sunn hemp fiber-reinforced polymer composite in correlation with fine structure of the fiber
| Autor: | Chinmayee Dash, Asim Das, D. K. Bisoyi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Hemp fiber biology Mechanical Engineering Composite number 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology biology.organism_classification 01 natural sciences chemistry.chemical_compound chemistry Mechanics of Materials 0103 physical sciences Materials Chemistry Ceramics and Composites Polymer composites Crotalaria juncea Crystallite Fiber Cellulose Composite material 0210 nano-technology |
| Zdroj: | Journal of Composite Materials. 54:3313-3327 |
| ISSN: | 1530-793X 0021-9983 |
| DOI: | 10.1177/0021998320914071 |
| Popis: | Present investigation is aimed on chemically modified of Sunn Hemp (Crotalaria juncea) fiber for composite fabrication. An increment in cellulose crystallinity with crystallite size is observed from X-ray diffraction study. The signature of impurities removal and an uneven surface are confirmed from Fourier Transmission Infrared Spectroscopy and Field Emission Scanning Electron Microscopy. Afterwards, both raw sunn hemp-reinforced fiber composite and dewaxed sunn hemp fiber-reinforced composite were fabricated using hand lay out method and the mechanical as well as dielectric properties of composite are studied. A better mechanical strength is found in DSHC which may attribute to rough surface and increased cellulose crystallinity through dewaxing process that promoted a fine interfacial bonding between fiber and matrix. Dielectric constants and losses are found to be less in dewaxed sunn hemp fiber-reinforced composite in comparison to raw sunn hemp-reinforced fiber composite due to decrease of water polar groups, which lead to lessening the effect of space charge polarization by treatment. Complex impedance and modulus study revealed the presence of single relaxation process in both systems. Lower ac conductivity value is observed in dewaxed sunn hemp fiber-reinforced composite due to decreasing of conducting polar OH groups. As a whole, the effort is established to correlate the mechanical and dielectric properties with fine structural parameters of the fiber. |
| Databáze: | OpenAIRE |
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