A new type of silicone rubber membranes with facilitated transport properties for oxygen was prepared by using 11-alkenoic acid cobalt, a silicone rubber containing vinyl groups of 5%（molar fraction）, a hydrogen-con...A new type of silicone rubber membranes with facilitated transport properties for oxygen was prepared by using 11-alkenoic acid cobalt, a silicone rubber containing vinyl groups of 5%（molar fraction）, a hydrogen-containing silicon oil and chlorine platinum acid. The solution casting and vulcanization were carried out simultaneously at room temperature. The studies on permselectivities show that O2 permeability coefficients increase with decreasing oxygen pressure difference, but N2 permeability coefficients are independent of nitrogen pressure difference. The cause is considered that a polymer cobalt complex is formed to possess an ability of facilitated transport for oxygen. This result leads to the increases in both oxygen permeability coefficient and oxygen/nitrogen separation coefficient at the same time. For example, oxygen permeability coefficient of 750 Barrer and oxygen nitrogen separation coefficient of 3.09 were obtained at a pressure difference of 0.05 MPa for the membrane containing 11-alkenoic acid cobalt of 2.5%（mass fraction）. As high as 5% of 11-alkenoic acid cobalt could be added into the membrane, its oxygen permeability coefficient and oxygen/nitrogen separation coefficient increase to 802 Barrer and 3.34 at the pressure difference of 0.05 MPa, respectively.展开更多
基金This work was supported by Grants from National"863"High-Tech Project(No.2002AA213011)National Natural Science Foundation(No.30270043)and Guangdong Key Task Project(No.C30109)
文摘A new type of silicone rubber membranes with facilitated transport properties for oxygen was prepared by using 11-alkenoic acid cobalt, a silicone rubber containing vinyl groups of 5%（molar fraction）, a hydrogen-containing silicon oil and chlorine platinum acid. The solution casting and vulcanization were carried out simultaneously at room temperature. The studies on permselectivities show that O2 permeability coefficients increase with decreasing oxygen pressure difference, but N2 permeability coefficients are independent of nitrogen pressure difference. The cause is considered that a polymer cobalt complex is formed to possess an ability of facilitated transport for oxygen. This result leads to the increases in both oxygen permeability coefficient and oxygen/nitrogen separation coefficient at the same time. For example, oxygen permeability coefficient of 750 Barrer and oxygen nitrogen separation coefficient of 3.09 were obtained at a pressure difference of 0.05 MPa for the membrane containing 11-alkenoic acid cobalt of 2.5%（mass fraction）. As high as 5% of 11-alkenoic acid cobalt could be added into the membrane, its oxygen permeability coefficient and oxygen/nitrogen separation coefficient increase to 802 Barrer and 3.34 at the pressure difference of 0.05 MPa, respectively.
