CR(chloroprene rubber)/NBR(nitrile rubber)(25/75 by weight) blend was reinforced with surface treated short aramid fibers(3mm) using an open mill, and effects of fiber loading were examined. Scorch and optimum cure times were increased with increasing fiber loading. Anisotropy in tensile modulus and strength was pronounced as the fiber loading increased, indicative of effective fiber alignment at high concentration. Abrasion resistance, compression set, and heat buildup were increased rapidly at low loading, and were kept almost constant at high loading. Upon aging, effect of fiber loading and modulus anisotropy became less pronounced due presumably to the post cure during aging test. Solvent swelling was reduced with fiber loading, especially at > 15%.

roll mill을 사용하여 CR/NBR(25/75 wt%) 블렌드에 aramid 단섬유(3mm)를 25 wt%까지 충전하면서 섬유함량에 따른 복합재료의 물성을 측정하였다. scorch 시간, 최적가류시간, 탄성율 및 강도의 이방성은 섬유 함량과 더불어 증가하였다. 마모저항, compression set 및 발열 역시 섬유함량과 더불어 증가하는 경향을 보였으나 고농도에서는 거의 일정하게 유지되었다. 노화 실험 후에는 섬유첨가 효과와 이방성이 감소되었으며, 용매 팽윤은 섬유함량 증가와 더불어 전반적으로 감소하는 경향을 보였다.

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