Abstract: A syntan was synthesized by the radical copolymerization of resorcinol （RSC） and 3,5-dihydroxy benzoic acid （DBA） with the catalytic system of horseradish peroxidase （HRP）/H₂O₂. The effects of the monomer composition and reaction factors on the properties of the copolymer were investigated，and the optimal reaction condition was obtained as follows：molar ratio of DBA to RSC 2∶1，polymerization 30 ℃，pH7.0 and the dropwise time of H₂O₂ 90 minutes. The structure and properties of the copolymer were characterized by FTIR，NMR and GPC，and the mechanism of polymerization of RSC and DBA was proposed. Applied results showed that the product has better retanning and assisting dying properties.

Key words: horseradish peroxidase, resorcinol, 3,5-dihydroxy benzoic acid, enzymatic catalytic polymerization, syntan

摘要： 在辣根过氧化物酶（HRP）/H₂O₂的催化体系下，间苯二酚（RSC）和3,5-二羟基苯甲酸（DBA）进行自由基聚合反应，制备了合成鞣剂。研究了单体配比以及反应各因素对共聚物性能的影响。结果表明，在间苯二酚和3,5-二羟基苯甲酸的摩尔配比为2∶1、反应温度为35 ℃、pH值为7.0、H₂O₂的滴加时间为90 min时，合成反应具有较高的产率。用红外光谱（FTIR）、核磁共振光谱（NMR）和凝胶渗透色谱（GPC）对聚合产物的结构和性能进行了表征。提出了RSC和DBA的自由基聚合反应机理。应用结果表明，聚合产物具有较好复鞣和助染性能。

关键词: 辣根过氧化物酶, 间苯二酚, 3,5-二羟基苯甲酸, 酶催化聚合, 合成鞣剂