疏水/亲水大孔聚二乙烯基苯/聚(N-2-氨基乙基丙烯酰胺)IPN树脂的合成及对水杨酸吸附性能研究

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用乙二胺氨解,合成了具有疏水/亲水性能的聚二乙烯基苯/聚(N-2-氨基乙基丙烯酰胺)(PDVB/PNAEAM)大孔互穿聚合物网络(IPN);测定了该树脂的孔结构、含水量、弱碱交换量和溶胀性能;测定了该树脂对水杨酸在不同温度下的吸附等温线,利用热力学函数关系计算出了吸附焓、自由能和熵.推测PDVB/PNAEAM IPN树脂中疏水性的PDVB一网具有疏水作用吸附能力、亲水性的PNAEAM一网具有氢键作用吸附能力.动态吸附及脱附实验表明湿态PDVB/PNAEAM IPN树脂对水溶液中水杨酸的饱和吸附量达到46.1mg/mL.树脂可以通过4%NaOH溶液再生.PDVB/PNAEAM IPN树脂在分离工业废水中水杨酸等芳香有机酸有良好的应用前景.

SYNTHESIS OF HYDROPHOBIC-HYDROPHILIC MACROPOROUS POLYDIVINYLBENZENE/POLY(N-2-AMINOETHYLACRYLAMIDE) IPN RESIN AND ITS ADSORPTION PERFORMANCES FOR SALICYLIC ACID IN AQUEOUS SOLUTIONS

The objective of this work was to develop an adsorption resin for removing aromatic acid contaminations of aqueous environment.The macroporous polydivinylbenzene/poly(methyl acrylate) interpenetrating polymer network was prepared by sequential suspension polymerization method;it was then converted to the hydrophobic-hydrophilic macroporous polydivinylbenzene/poly(N-2-aminoethylacrylamide) interpenetrating polymer network(PDVB/PNAEAM IPN) by aminolysis with ethylenediamine.The hydrophobic PDVB part in PDVB/PNAEAM IPN resin has the ability of adsorption through hydrophobic interaction;on the other hand the hydrophilic PNAEAM part has the ability of adsorption by means of hydrogen bonding.For the adsorption studies salicylic acid was chosen as the representative of aromatic acids,because there is a hydrophobic benzene ring and a hydrophilic hydroxyl group in the molecule.The pore structure,the weak base exchange capacity,the water retention capacity and the swelling ratio of PDVB/PNAEAM IPN resin were measured.The adsorption isotherms of salicylic acid at different temperatures were studied.Isothermal adsorption enthalpy,Gibbs free energy and entropy were calculated according to thermodynamic equations.The saturated adsorption capacity for salicylic acid was up to 46.1 mg/mL(wet resin) according to the dynamic adsorption and desorption experiments.The resin can be regenerated by 4% NaOH.The results of adsorption for salicylic acid indicate that the PDVB/PNAEAM IPN resin may have a promising prospect in separating aromatic acid from waste water in industry.