Peroxidase‐catalyzed polymerization and copolymerization of lignin‐based macromonomer (lignocresol) having high content of p‐cresol and thermal properties of the resulting polymers
Peroxidase‐catalyzed polymerization and copolymerization of lignin‐based macromonomer (lignocresol) having high content of p‐cresol and thermal properties of the resulting polymers
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DOI：
10.1002/pat.621
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发表时间：
2005-11
影响因子：
3.4
通讯作者：
Takashi Yoshida;Zuyong Xia;K. Takeda;T. Katsuta;Kazutoshi Sugimoto;M. Funaoka
中科院分区：
文献类型：
--
作者：
Takashi Yoshida;Zuyong Xia;K. Takeda;T. Katsuta;Kazutoshi Sugimoto;M. Funaoka
以木质素和对甲酚为原料，在硫酸水溶液中通过相分离体系制备木质素大分子单体--木质素苯酚，并首次在有机溶剂中进行过氧化物酶催化聚合，得到不溶性聚合物，产率为55%。结果表明，在木质素侧链上引入对甲酚后，木质素酚的过氧化物酶聚合能力比原木质素提高。对甲酚与木基苯酚的共聚反应高产率地得到了相应的共聚物。IR结果表明，木姜子甲苯酚可能是通过苯氧基自由基聚合而成的。聚合物的裂解气相色谱-质谱（GC-MS）分析表明，木酚基苯酚的聚合主要涉及在引入的对甲酚的氧化偶联。通过差示扫描量热法（DSC）和热重分析（TGA）测量得到的聚合物的热性能，其特征在于，根据交联结构的聚合物具有较高的热稳定性。版权所有© 2005年约翰威利父子有限公司。
Peroxidase-catalyzed polymerization of lignin-based macromonomer, lignocresol, which was prepared by the phase-separation system of lignin and p-cresol in aqueous sulfuric acid, was carried out for the first time in aqueous organic solvents to give insoluble polymers in 55% yield. It was found that the polymerizability of lignocresol by peroxidase was enhanced by the introduction of p-cresol in lignin side-chains compared to that of original lignin. Copolymerization of lignocresol with p-cresol gave the corresponding copolymers in high yields. From the IR results, lignocresol might be polymerized through a phenoxyl radical. The pyrolysis gas chromatography-mass spectrometry (GC-MS) analysis of the polymers obtained indicated that the polymerization of lignocresol involved mainly the oxidative coupling at the introduced p-cresol. The thermal properties of the polymers obtained were characterized by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) measurements, suggesting that the polymers have high thermal stability according to the crosslinked structures. Copyright © 2005 John Wiley & Sons, Ltd.