由溶于四丁基氢氧化𬭸水溶液的木质素制备的环氧树脂。
Preparation of epoxy resins derived from lignin solubilized in tetrabutylphosphonium hydroxide aqueous solutions.
机构信息
Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-choi, Kogane, Tokyo 184-8588, Japan; Functional Ionic Liquid Laboratories, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.
Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-choi, Kogane, Tokyo 184-8588, Japan; Functional Ionic Liquid Laboratories, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan; Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy.
出版信息
Int J Biol Macromol. 2019 Jul 1;132:585-591. doi: 10.1016/j.ijbiomac.2019.03.152. Epub 2019 Mar 23.
Organic onium hydroxide aqueous solutions (OHAS) are demonstrated to be potential solvents for the dissolution of lignin and its epoxidation. A series of OHAS has been assessed in terms of the solubility of soda lignin (SL) and Klason lignin (KL), which are moderately and rarely soluble in NaOH aq. soln., respectively. Tetrabutylphosphonium hydroxide ([P]OH) aqueous solution was found to exhibit a highest solubility, specifically 40 wt% of SL and 3.0 wt% of KL. The superior solubility of OHAS is comprehended to be due to weak interactions between OH anions and phosphonium cations, and hence OH anions interact effectively with lignin. Epoxidation of SL was achieved by simply adding epichlorohydrin to [P]OH aq. dissolving SL. Films of epoxidized SL were prepared by thermal curing with the aid of a crosslinking agent, and the films were found to possess high thermal stability of >250 °C and excellent ductility. The thermal and mechanical properties were controllable by the concentration of [P]Cl as an additive.
有机氧鎓氢氧化物水溶液 (OHAS) 已被证明是溶解木质素及其环氧化的潜在溶剂。一系列 OHAS 已根据苏打木质素 (SL) 和 Klason 木质素 (KL) 的溶解度进行了评估，它们在 NaOH aq. soln. 中的溶解度分别为中等和很少。发现四丁基氢氧化磷 ([P]OH) 水溶液具有最高的溶解度，具体为 40 wt% 的 SL 和 3.0 wt%的 KL。OHAS 的优异溶解度归因于 OH 阴离子和膦阳离子之间的弱相互作用，因此 OH 阴离子可有效与木质素相互作用。通过简单地向[P]OH 水溶液中添加表氯醇即可实现 SL 的环氧化。通过使用交联剂热固化制备了环氧化 SL 的薄膜，发现该薄膜具有 >250°C 的高热稳定性和优异的延展性。通过添加 [P]Cl 作为添加剂，可以控制热和机械性能。
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