介孔分子筛/丙烯酸钠改性三元乙丙吸水膨胀橡胶的合成及性能

Water-Swelling Properties of EPDM Rubber Modified by in Situ Formed Sodium Acrylate/Mesoporous Molecular Sieve

通过氢氧化钠(NaOH)与丙烯酸(AA)的中和反应,在三元乙丙橡胶(EPDM)中原位合成丙烯酸钠(NaAA),同时在橡胶中加入介孔分子筛MCM-41进行机械混炼,并在有机过氧化物作用下将所得混炼胶进行硫化,研究不同配比的丙烯酸钠与介孔分子筛MCM-41对吸水膨胀橡胶的影响。研究结果表明,随着MCM-41用量的增加,吸水膨胀橡胶(WSR)的拉伸强度、断裂伸长率、吸水膨胀率均得到提高。尤其是加入MCM-41(0.5phr)时拉伸强度、断裂伸长率、吸水膨胀率均达到最大值,分别为6.4MPa、386.2%、210%,比未添加MCM-41组分的橡胶的拉伸强度提高了18%,断裂伸长率提高了16.8%,吸水膨胀率提高了13.5%。通过扫描电镜看出,加入MCM-41(0.5phr)的样品与未添加分子筛之前样品相比,其骨架呈立体网状结构,孔洞均匀。表明MCM-41的加入起到了增容剂和协效剂作用。

A water-swelling rubber was prepared using sodium acrylate （NaAA） in situ formed in EPDM rubber. Mesoporous molecular sieve MCM-41 was added into rubber, and obtained blends were vulcanized with dicumyl peroxide （DCP）. The effect of the content of sodium acrylate and MCM-41 on the mechanical properties of the water-swelling rubber were investigated. The results show that the tensile strength, elongation at break, and water- swelling properties reach the maximum value of 6.4MPa,386.2 % ,210 % respectively when the content of MCM-41 is 0.5 phr, and increase by 18 %, 16.8 %, 13.5 % respectively comparing with those of rubber without MCM-41. SEM images show that the skeleton of the water-swelling rubber with 0.5 phr MCM-41 is a three-dimensional network and the structure of holes is homogeneous, implying that MCM-41 together with NaAA can be used as a compatibilizer to increase the miscibility.