半互穿网络结构聚离子液体增强嵌段聚醚气体分离膜的制备及CO_2渗透性研究

Semi-interpenetrating polymer network membranes based on poly(ionic liquid)and Pluronic F127 for CO_2 separation performance

结合聚离子液体(PIL)超强的CO_2吸附能力和功能可设计性特征,以1-辛基-3-乙烯基咪唑六氟磷酸盐([voim][PF6])为聚合单体,聚氧乙烯-聚氧丙烯-聚氧乙烯三嵌段聚醚(PluronicF127)为线性聚合物,采用紫外光固化法制备了聚离子液体增强嵌段聚醚(F127/PIL)半互穿网络膜,研究了PIL与F127质量比对半互穿网络机械强度、微观形貌及CO_2/N_2渗透性能的影响。结果表明:与纯F127相比,F127/PIL半互穿网络膜具有良好的成膜性和机械性能,当F127与PIL质量比为30∶70时,半互穿网络膜的拉伸强度可达4.569MPa;随着PIL交联网络含量的增加,半互穿网络膜的CO_2、N_2扩散系数和渗透系数均提高,但CO_2溶解度系数逐渐下降;当F127与PIL质量比为20∶80时,半互穿网络膜的CO_2渗透系数达到155.59Barrer,CO_2/N_2选择性系数为24.16;随着温度的升高,F127/PIL半互穿网络膜的CO_2和N_2渗透系数和扩散系数均增加,溶解度系数降低。

Based on the superior CO2 separation performance and tunable physicochemical nature of poly（ionic liquid）（PIL）,a series of gas separation membranes with semi-interpenetrating polymer network（semi-IPN）structure were successfully synthesized from Pluronic F127 and crosslinked PIL.Compared with Pluronic F127,the obtained F127/PIL semi-IPN membranes displayed much improved mechanical strength and good film-forming property.The tensile strength of membranes containing 70% PIL was 4.569 MPa.From gas permeation measurement results,the membranes demonstrated gradually higher CO2 permeability coefficient with the increase of PIL content,while CO2/N2 selectivity increased initially and then decreased slightly.The best CO2 permeability and CO2/N2 selectivity of membranes reached 155.59 Barrer and 24.16 respectively when PIL content was 80 wt%.Moreover,the permeability of CO2 in membranes increased with increasing temperature across their glasstransition temperatures,while CO2/N2 selectivity decreased.