疏水/亲水性聚二乙烯基苯/聚丙烯酸大孔互穿聚合物网络树脂对苯胺的吸附性能

采用分步悬浮聚合法制备了聚二乙烯基苯/聚丙烯酸甲酯（PDVB/PMA）大孔互穿聚合物网络，将其中的聚丙烯酸甲酯转化为聚丙烯酸，得到具有疏水/亲水性能的聚二乙烯基苯/聚丙烯酸（PDVB/PAA）大孔互穿聚合物网络（IPN），研究了这类疏水/亲水大孔PDVB/PAA IPN对苯胺的吸附热力学和吸附动力学，测定了该树脂的孔结构、含水量、弱酸交换量和溶胀性能；测定了该树脂对苯胺在不同温度下的吸附等温线，利用热力学函数关系计算了吸附焓、自由能和熵。 红外光谱显示，成功合成了疏水/亲水PDVB/PAA IPN，与PDVB、PDVB/PMA IPN树脂相比，其BET表面积以及孔容均减小，含水量为62.73％，弱酸交换量为1.91 mmol/g；对苯胺的吸附为放热、自发的过程;溶胀实验、静态解吸实验表明，PDVB/PAA IPN树脂中疏水性的PDVB网具有疏水作用吸附能力，亲水性的PAA网具有氢键作用吸附能力。 对苯胺的吸附在90 min时即可达到吸附平衡，树脂吸附苯胺符合一级速率方程，吸附速率主要受颗粒内扩散的控制，同时还受液膜扩散的影响，吸附动力学可采用HSDM模型描述。

Adsorption of Phenylamine by Hydrophobic-Hydrophilic Polydivinylbenzene/poly(acrylic acid) Polymeric Macroporous Network Resin

Interpenetrating polydivinylbenzene/poly(methyl acrylate) polymeric macroporous network(PDVB/PMA IPN) was prepared by sequential suspension polymerization method. By converting PMA into PAA, a hydrophobic-hydrophilic macroporous polydivinylbenzene/poly(acrylic acid) IPN(PDVB/PAA IPN) was achieved. The adsorption thermodynamics and adsorption kinetics of the hydrophobic-hydrophilic IPN were studied. The pore structure, weak acid exchange capacity, water retention capacity and swelling ratio of PDVB/PAA IPN resin were measured. The study focused on the adsorption isotherms of phenylamine at different temperatures. Isosteric adsorption enthalpy, Gibbs free energy and entropy can be calculated according to thermodynamic functions. Infrared spectra results showed that PDVB/PAA IPN resin was successfully synthesized. Compared with the PDVB, PDVB/PMA IPN resin, the BET surface area and pore volume of the PDVB/PAA IPN resin were decreased significantly. The weak acid exchange capacity was 1.91 mmol/g. The water retention capacity was 62.73％. The adsorption of phenylamine was found to be an exothermic process. The experiments of the swelling ratio and the static desorption revealed that the hydrophobic PDVB part in PDVB/PAA IPN resin was responsible for the adsorption of phenylamine through hydrophobic interaction, while the hydrophilic PAA part could adsorb phenylamine by means of hydrogen bondings. The adsorption of phenylamine onto the PDVB/PAA IPN resin reached the equilibrium after 90 min. The adsorption kinetic data of phenylamine fitted the first order rate equation. The intrapartical diffusion of phenylamine was the main rate-controlling step. Adsorption rate was also affected by the film diffusion. The adsorption kinetic data of phenylamine could be described by HSDM model.