Green composites. I. physical properties of ramie fibers for environment-friendly green composites |
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Authors: | Sunghyun Nam Anil N Netravali |
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Institution: | (1) Graduate Students of Science and Engineering, Yamaguchi University, Ube Yamaguchi, 755-8611, Japan;(2) Department of Mechanical Engineering, Yamaguchi University, Ube Yamaguchi, 755-8611, Japan; |
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Abstract: | The surface topography, tensile properties, and thermal properties of ramie fibers were investigated as reinforcement for
fully biodegradable and environmental-friendly ‘green’ composites. SEM micrographs of a longitudinal and cross-sectional view
of a single ramie fiber showed a fibrillar structure and rough surface with irregular cross-section, which is considered to
provide good interfacial adhesion with polymer resin in composites. An average tensile strength, Young’s modulus, and fracture
strain of ramie fibers were measured to be 627 MPa, 31.8 GPa, and 2.7 %, respectively. The specific tensile properties of
the ramie fiber calculated per unit density were found to be comparable to those of E-glass fibers. Ramie fibers exhibited
good thermal stability after aging up to 160°C with no decrease in tensile strength or Young’s modulus. However, at temperatures
higher than 160°C the tensile strength decreased significantly and its fracture behavior was also affected. The moisture content
of the ramie fiber was 9.9%. These properties make ramie fibers suitable as reinforcement for ‘green’ composites. Also, the
green composites can be fabricated at temperatures up to 160°C without reducing the fiber properties. |
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