237 吸水環境下における麻繊維強化複合材料の曲げ強度特性(生体・環境適合型材料の創製と特性評価)

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In this study, flexural properties of HGC (Hemp fiber reinforced Green Composite) were examined under water environment. The plain woven hemp fiber was used as reinforcement. PLA (Poly Lactic Acid) resin was used as matrix. Two types of specimens whose fiber volume fractions were 36% (6ply) and 18% (3ply) were used. Mass gain and strain of these composites and resin bulk specimens were measured for maximum 30days at RT (Room temperature). Static flexural test was conducted for Wet specimens. Wet specimen means immersed one in water. As a result, following conclusions are obtained. Water absorption of the composite and resin bulk increased with an increase of immersion time in a distilled water at RT. Water absorption ratio of HGC and resin bulk became the equilibrium in a distilled water at RT over 15 days. Flexural strength of HGC (3ply, 6ply) decreased with increase that of HGC and Resin. And the flexural strength decreased 53.6% when water absorption ratio of HGC was 7%. When HGC was immersed in a distilled water at RT, the resource of that water absorption ratio, Volume Change and flexural strength of HGC was by absorbing fiber/resin interface, fiber bundle and resin in water.
一般社団法人日本機械学会の論文
2009-11-06