リグニン系循環型素材の設計と誘導 -C1-フェノール核を活用した循環型高次構造設計-

リグニン系循環型素材の設計と誘導 -C1-フェノール核を活用した循環型高次構造設計-
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木质素基循环材料的设计和诱导 - 利用 C1-苯酚核的循环高阶结构设计 -

DOI:
10.2115/fiber.57.75
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发表时间:
2001
期刊:
影响因子:
--
通讯作者:
正光 舩岡
正光 舩岡
中科院分区:
材料科学4区
文献类型:
--
作者:
永松 ゆきこ;正光 舩岡

文献摘要

被引文献

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以天然木质素为原料,利用酚类和浓酸组成的相分离体系,在碱性条件下,1,1-双(芳基)丙烷型单元的C1-酚氧基进攻相邻的C2,然后裂解芳基醚键(交换功能),直接合成可回收的木质素基材料--木质酚。虽然木质素对甲酚和木质素-2,4-二甲基苯酚具有相似的结构特征和解聚模式,但木质素对甲酚的羟甲基化程度比木质素-2,4-二甲基苯酚高:木质素对甲酚中羟甲基的引入量为0.81mol/C9,木质素-2,4-二甲基苯酚中羟甲基的引入量为0.15mol/C9。对羟甲基化木质素-对甲酚和木质素-2,4-二甲基苯酚进行了热聚合,分别得到了网络型和线型聚合物。通过碱处理,所得聚合物链在转换点处裂解以得到低分子量亚基。
Recyclable lignin-based materials, lignophenols were synthesized directly from native lignins, using the phase-separation system composed of phenols and concentrated aci(L Under alkalioe condition C1-phenoxide of 1, 1-bis(aryl)propane type units attacked adjacent C2, followed by the cleavage of ayl ether linkages (switehing function). Although ligno-p-cresol and ligno-2, 4-dimethylphenol had similar structural characteristics and depolymerization patterns, ligno-p-cresol with a reaction site on cresolic nuclei was hydroxymethylated to a larger extent than ligno-2, 4-dimethylphenol: the amount of introduced hydroxymethyl group was 0.81mol/C9 in ligno-p-cresol, 0.15mol/C9 in ligno-2, 4-dimethylphenol. Hydroxymethylated ligno-p-cresol and ligno-2, 4-dimethylphenol were polymerized by heating to give a network type- and a linear type-polymers, respectively. The resulting polymer chains were cleaved at the switching points to give low molecular weight subunits by the alkaline treatment.