交联型吸水膨胀天然橡胶的吸水性能

Water Absorption of Crosslinked Water Swellable Natural Rubber

以天然胶乳为原料、丙烯酰胺为吸水单体,通过接枝共聚反应制得吸水膨胀天然橡胶(WSNR),并分别以甲醛为吸水单体交联剂、硫黄为天然橡胶(NR)交联剂,经过接枝共聚反应制备单体交联型WSNR和橡胶硫化交联型WSNR。研究交联方式对WSNR吸水性能的影响。结果表明:WSNR的吸水率和重复吸水恢复率随着吸水单体和NR交联程度的提高而降低,而储能模量则随之提高;交联处理使WSNR吸束缚水的能力减弱,失水稳定性降低,且体系网络结构致密,孔洞减少。

Water swellable natural rubber（WSNR）was prepared from natural rubber latex grafted with water absorbing monomer acrylic-amide.In this study,two types of WSNR were prepared.One was crosslinked by sulfur and the other one was crosslinked by using water absorbing monomer,formaldehyde.The effect of crosslinking method on the water absorption of WSNR was then investigated.The results showed that the swelling ratio and repeated water adsorption of WSNR decreased with increase of crosslinking degree,while the storage moduli were enhanced.It was found that,with the increase of crosslinking degree,the capacity of bound water absorption and water retention decreased,the network structure was more compact,and the number of pores was reduced.