Abstract Sorbitol polyglycidyl ether (SPE), which is a bio-based water-soluble epoxy resin, was cured with lysine (Lys) and arginine (Arg) as basic amino acids and with cysteine (Cys) as an acidic amino acid. Furthermore, biocomposites of the Lys- and Arg-cured SPE (SPE-Lys and SPE-Arg) and Cys-cured SPE (SPE-Cys) with chitin nanofiber (ChNF) not higher than 10 wt% were successfully prepared by compression molding and casting methods, respectively. Also, SPE-Cys biocomposites with chitosan nanofiber (CsNF) not higher than 2 wt% were successfully prepared by the casting method. The FT-IR spectral analysis of the cured resins suggested that the e-amino and carboxy groups of Lys, α-amino and carboxy groups of Arg, thiol group of Cys mainly reacted with epoxy groups of SPE. The FT-IR spectral analysis of the ChNF biocomposites suggested that a side reaction of SPE with acetic acid which was contained in ChNF suspension occurred. The dynamic mechanical analysis revealed that a higher order of the loss modulus peak temperature (Tα) was SPE-Lys (39 °C) > SPE-Arg (33 °C) > SPE-Cys (21 °C). Although Tαs of ChNF biocomposites were lower than those of the corresponding cured resins, Tαs of SPE-Cys/CsNF biocomposites were higher than that of SPE-Cys by the action of CsNF as a basic catalyst. The storage moduli over the range of 50–100 °C for SPE-Lys/ChNF, SPE-Cys/ChNF and SPE-Cys/CsNF biocomposites were much higher than those for the corresponding cured resins. SPE-Lys/ChNF and SPE-Cys/CsNF biocomposites exhibited higher tensile strengths and moduli than SPE-Lys and SPE-Cys did, respectively.

中文翻译：

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氨基酸固化的生物基环氧树脂及其与几丁质和壳聚糖纳米纤维的生物复合材料

摘要 山梨糖醇聚缩水甘油醚(SPE)是一种以赖氨酸(Lys)和精氨酸(Arg)为碱性氨基酸，半胱氨酸(Cys)为酸性氨基酸的生物基水溶性环氧树脂。此外，Lys 和 Arg 固化的 SPE（SPE-Lys 和 SPE-Arg）和 Cys 固化的 SPE（SPE-Cys）与几丁质纳米纤维（ChNF）不高于 10 wt% 的生物复合材料通过压缩成型和铸造方法，分别。此外，通过浇铸方法成功制备了壳聚糖纳米纤维 (CsNF) 不高于 2 wt% 的 SPE-Cys 生物复合材料。固化树脂的FT-IR光谱分析表明Lys的ε-氨基和羧基，Arg的α-氨基和羧基，Cys的硫醇基主要与SPE的环氧基反应。ChNF 生物复合材料的 FT-IR 光谱分析表明，SPE 与 ChNF 悬浮液中含有的乙酸发生了副反应。动态力学分析表明，损耗模量峰值温度 (Tα) 的更高阶是 SPE-Lys (39 °C) > SPE-Arg (33 °C) > SPE-Cys (21 °C)。尽管 ChNF 生物复合材料的 Tαs 低于相应固化树脂的 Tαs，但由于 CsNF 作为碱性催化剂的作用，SPE-Cys/CsNF 生物复合材料的 Tαs 高于 SPE-Cys。SPE-Lys/ChNF、SPE-Cys/ChNF 和 SPE-Cys/CsNF 生物复合材料在 50–100 °C 范围内的储能模量远高于相应固化树脂的储能模量。SPE-Lys/ChNF 和 SPE-Cys/CsNF 生物复合材料分别表现出比 SPE-Lys 和 SPE-Cys 更高的拉伸强度和模量。