天然繊維強化プラスチック成形品の耐水性

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  • Effect of Environmental Water on Natural Fiber Reinforced Plastics Injection Moldings
  • テンネン センイ キョウカ プラスチック セイケイヒン ノ タイスイセイ

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This study dealt with the effects of environmental water on tensile properties of jute fiber reinforced polypropylene (PP) injection moldings. The long fiber type jute/PP pellet and neat PP pellet were used as materials and the jute/PP specimens with diff erent fi ber content were preparedby injection molding with dry-blending of jute/PP and neat PP pellets. All the specimens were aged in hot distilled water at 80℃ , and after the fi xed periods of immersion, the weight changes and thetensile properties were measured. The weight gain by water absorption was signifi cantly affected by the fiber content. The specimens with the jute fiber content of 30wt% and more easily absorbed the water and it reached more than 10% . In these specimens signifi cant material loss by immersion wasalso occurred. The tensile strength after immersion decreased remarkably in the specimens with the jute fiber content of 30wt% and more, and all the jute/PP composites showed the lower strength thanneat PP after the immersion of 1000 hours.

This study dealt with the effects of environmental water on tensile properties of jute fiber reinforced polypropylene (PP) injection moldings. The long fiber type jute/PP pellet and neat PP pellet were used as materials and the jute/PP specimens with diff erent fi ber content were preparedby injection molding with dry-blending of jute/PP and neat PP pellets. All the specimens were aged in hot distilled water at 80℃ , and after the fi xed periods of immersion, the weight changes and thetensile properties were measured. The weight gain by water absorption was signifi cantly affected by the fiber content. The specimens with the jute fiber content of 30wt% and more easily absorbed the water and it reached more than 10% . In these specimens signifi cant material loss by immersion wasalso occurred. The tensile strength after immersion decreased remarkably in the specimens with the jute fiber content of 30wt% and more, and all the jute/PP composites showed the lower strength thanneat PP after the immersion of 1000 hours.

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