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。
The sharp brittle-tough transition is observed at a critical interparticle distance when the content of elastomer is relatively high.
研究了PP/EPDM /纳米弹性体粒子（ENP）三元共混体系的脆韧转变行为。
The brittle-ductile transition of PP/EPDM/Elastomeric nano-meter particle (ENP) was studied.
对于脆性较大的UPR，只有在采用加载速度较慢的断裂韧性来表征其韧性时，方能观察到这一脆韧转变现象。
For the UPR with greater brittleness, the brittle-tough transition was observed only when the toughness of the resin was characterized by fracture toughness at a slower loading rate.
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