实验结果表明：少量的NBR能大幅度提高HDPE的冲击韧性和耐环境应力开裂性能。
The results show that a small amount of NBR can greatly improve the environmental stress crack resistance(ESCR) and the impact strength of HDPE.
首先，PP发泡材料的成本较低，韧性、刚性、耐疲劳性和耐环境应力开裂性等性能都很好。
Firstly, PP foam has low cost, high elasticity, rigidity. It is durable and performs well under environmental pressure.
玻璃化转变温度以下的热处理可以提高PC的拉伸强度，但是对改善材料的耐环境应力开裂性不利。
The tensile strength of PC can he improved by the thermal treatment at the temperature below its glass transition temperature, but the property of the resistance of ESC of PC will be decreased.
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