Anion exchange membranes based on semi-interpenetrating polymer network of quaternized chitosan and polystyrene.
Anion exchange membranes based on semi-interpenetrating polymer network of quaternized chitosan and polystyrene.
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DOI：
10.1016/j.jcis.2011.05.039
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发表时间：
2011-09
影响因子：
9.9
通讯作者：
Jilin Wang;R. He;Quantong Che
中科院分区：
文献类型：
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作者：
Jilin Wang;R. He;Quantong Che
以季铵化壳聚糖（QCS）和聚苯乙烯（PS）为原料，制备了半互穿聚合物网络（semi-IPN）阴离子交换膜。PS是通过苯乙烯单体在QCS在乙酸水溶液中的乳液中在氮气气氛下在高温下聚合而合成的。通过QCS的后交联形成半互穿网络体系。在80 °C下的羟基离子电导率为2.80 × 10 - 2S cm-1，在室温下的拉伸断裂应力为20.0 MPa，分别通过含有21 wt.%的PS。通过监测电导率和机械强度的变化来测试半互穿网络膜在碱性溶液中的耐久性。在室温下将膜浸入1 mol L-1 KOH溶液中72 h和在60 °C下浸入50 h，在80 °C下电导率的下降约为5%。在室温下浸泡10 mol L-1 KOH溶液70 h以上，膜的室温拉伸断裂应力可保持在20.0 MPa左右。根据高分子链的应力松弛模型讨论了半互穿网络膜的吸水膨胀过程，其吸水膨胀符合Schott二级膨胀动力学。
Anion exchange membranes with semi-interpenetrating polymer network (semi-IPN) were prepared based on quaternized chitosan (QCS) and polystyrene (PS). The PS was synthesized by polymerization of styrene monomers in the emulsion of the QCS in an acetic acid aqueous solution under nitrogen atmosphere at elevated temperatures. The semi-IPN system was formed by post-cross-linking of the QCS. A hydroxyl ionic conductivity of 2.80 × 10−2S cm−1at 80 °C and a tensile stress at break of 20.0 MPa at room temperature were reached, respectively, by the semi-IPN membrane containing 21 wt.% of the PS. The durability of the semi-IPN membrane in alkaline solutions was tested by monitoring the variation of the conductivity and the mechanical strength. The degradation of the conductivity at 80 °C was about 5% by immersing the membrane in a 1 mol L−1KOH solution at room temperature for 72 h and at 60 °C for 50 h, respectively. The tensile stress at break at room temperature could maintain about 20.0 MPa for the membrane soaking in a 10 mol L−1KOH solution at ambient temperature for more than 70 h. The water swelling of the semi-IPN membranes was discussed based on the stress relaxation model of polymer chains, and it obeyed the Schott’s second-order swelling kinetics.