Epoxy resin synthesis using low molecular weight lignin separated from various lignocellulosic materials
Epoxy resin synthesis using low molecular weight lignin separated from various lignocellulosic materials
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DOI：
10.1016/j.ijbiomac.2014.12.039
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发表时间：
2015-03-01
影响因子：
8.2
通讯作者：
Nakamura, Yoshitoshi
中科院分区：
文献类型：
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作者：
Asada, Chikako;Basnet, Sunita;Nakamura, Yoshitoshi
来自各种木质纤维素材料的低分子量木质素用于合成生物基环氧树脂。用甲醇从不同生物质（即雪松、桉树和竹子）的蒸汽爆破样品中提取木质素（蒸汽压力为3.5 MPa，蒸煮时间为5 min），在水溶性相转移催化剂四甲基氯化铵的催化下，通过与环氧氯丙烷的反应进行功能化，并进一步与30 wt%的NaOH水溶液以甲乙酮为溶剂进行闭环反应。溶剂。使用生物基固化剂（即木质素本身和商业固化剂 TD2131）将木质素的缩水甘油化产物以良好的产率固化成环氧聚合物网络。生物基环氧网络具有较好的热性能，雪松环氧树脂在5%失重时的热分解温度（Td(5)）高于桉树和竹子环氧树脂。该生物基树脂满足了适用于电路板的环氧树脂的稳定性要求。不溶于甲醇的残留物被酶水解产生葡萄糖。这项研究表明，生物质衍生的甲醇可溶性木质素可能是一种有前途的候选者，可用作双酚 A 衍生的石油基环氧树脂的替代品，而不溶性残留物可以加工成生物乙醇前体，即葡萄糖。 (C) 2015 Elsevier B.V. 保留所有权利。
A low molecular weight lignin from various lignocellulosic materials was used for the synthesis of bio-based epoxy resins. The lignin extracted with methanol from steam-exploded samples (steaming time of 5 min at steam pressure of 3.5 MPa) from different biomasses (i.e., cedar, eucalyptus, and bamboo) were functionalized by the reaction with epichlorohydrin, catalyzed by a water-soluble phase transfer catalyst tetramethylammonium chloride, which was further reacted with 30 wt% aqueous NaOH for ring closure using methyl ethyl ketone as a solvent. The glycidylated products of the lignin with good yields were cured to epoxy polymer networks with bio-based curing agents i.e., lignin itself and a commercial curing agent TD2131. Relatively good thermal properties of the bio-based epoxy network was obtained and thermal decomposition temperature at 5% weight loss (Td(5)) of cedar-derived epoxy resin was higher than that derived from eucalyptus and bamboo. The bio-based resin satisfies the stability requirement of epoxy resin applicable for electric circuit boards. The methanol-insoluble residues were enzymatically hydrolyzed to produce glucose. This study indicated that the biomass-derived methanol-soluble lignin may be a promising candidate to be used as a substitute for petroleum-based epoxy resin derived from bisphenol A, while insoluble residues may be processed to give a bioethanol precursor i.e., glucose. (C) 2015 Elsevier B.V. All rights reserved.