The sharp brittle-toughtransition is observed at a critical interparticle distance when the content of elastomer is relatively high.
当弹性体的含量高到一定程度，分散相的粒间距达到临界值，则发生明显的脆韧转变。
2
For the UPR with greater brittleness, the brittle-toughtransition was observed only when the toughness of the resin was characterized by fracture toughness at a slower loading rate.