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To improve the toughness of silicone-modified epoxy resin, an aramid-silicone block copolymer was used as a compatibilizer. Fine silicone phases could be uniformly and stably dispersed in the epoxy matrix by the addition of the block copolymer. The relative ratio of the molecular weight of epoxy and silicone segments in the block copolymer strongly affected the effectiveness of the compatibilizer...