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
中科院分区:
文献类型:
--
作者:
永松 ゆきこ;正光 舩岡
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.