EPDM基吸水膨胀橡胶的力学性能

Mechanical properties of EPDM based water swelling rubber

研究了三元乙丙橡胶与聚丙烯酰胺共混制得的吸水膨胀橡胶的力学性能，发现聚丙烯酰胺用量对干态吸水膨胀橡胶的强伸性能有明显影响； 而当聚丙烯酰胺含量一定时， 随吸水膨胀橡胶吸水膨胀率的提高，强伸性能出现一个最佳值后下降，压缩永久变形则随吸水膨胀率的提高而减小，这种现象可能与聚丙烯酰胺吸水后物理性质变化有关。

The mechanical properties of water swelling rubber(WSR) made by EPDM and hydrolyzed polyacrylamide(PAM) was investigated. The content of PAM in WSR influenced the tensile properties of dry WSR substantially. When the PAM content remained constant(e.g. 30 phr), the tensile properties of WSR showed a maximum value at a certain water swelling degree, while the compression permanent set decressed as the water swelling degree increased. These phenomena were explained by the change of physical properties of PAM after water absorbing.