This work introduces a promising biodegradable copolymer synthesized through the fusion of D,L-aspartic acid (ASP) and L-glutamic acid (GA) utilizing melt polymerization. Employing infrared spectroscopy (IR), nuclear magnetic resonance spectroscopy (1H NMR, 13C NMR), and X-ray diffraction (XRD), the copolymer’s structural characterization highlights its distinctive physicochemical attributes. The synthesis, conducted with a facile and controllable melt polymerization method, yielded a remarkable product yield of up to 81%. The optimization of water absorption properties involved a meticulous exploration of various diamine cross-linking agents—hexamethylene diamine (HMD), lysine (LYS), and a synthesized tartaric acid dihydrazide (TD) derivative. Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (NMR), and scanning electron microscopy (SEM) were employed to confirm the copolymer’s structure, morphology, and cross-linking efficiency. The findings underscore exceptional water retention capabilities, with a peak swelling ratio of 11.874% achieved at a 10% concentration of hexamethylene diamine. Beyond advancing superabsorbent materials, this study contributes to mitigating environmental concerns associated with non-biodegradable alternatives.

中文翻译：

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具有不同交联剂的可生物降解聚（天冬氨酸-谷氨酸）水凝胶作为土壤添加剂的制备和表征

这项工作介绍了一种有前景的可生物降解共聚物，通过熔融聚合将 D,L-天冬氨酸 (ASP) 和 L-谷氨酸 (GA) 融合而成。采用红外光谱（IR）、核磁共振光谱（1核磁共振氢谱,13通过 C NMR）和 X 射线衍射（XRD），该共聚物的结构表征凸显了其独特的物理化学属性。该合成采用简便可控的熔融聚合方法进行，产物收率高达 81%。吸水性能的优化涉及对各种二胺交联剂——六亚甲基二胺（HMD）、赖氨酸（LYS）和合成的酒石酸二酰肼（TD）衍生物的细致探索。采用傅里叶变换红外光谱（FT-IR）、核磁共振光谱（NMR）和扫描电子显微镜（SEM）来确认共聚物的结构、形态和交联效率。研究结果强调了卓越的保水能力，在 10% 浓度的己二胺下，峰值溶胀率为 11.874%。除了改进超吸收性材料之外，这项研究还有助于减轻与不可生物降解替代品相关的环境问题。