Abstract

Itaconic acid (IA) is a bio-based unsaturated monomer, which has been limitedly used in free-radical polymerization due to low reactivity of its carbon-carbon double bond and lack of tendency toward homo-polymerization. In the present work, IA was modified with glyceryl methacrylate (GMA) or epichlorohydrin (ECH) to synthesize two new IA-based materials, i.e., IA-GMA and IA-ECH, respectively. After the characterization of the crosslinkers by ¹H NMR and FTIR, IA-GMA containing two methacrylate groups in the structure was used as an internal crosslinker for the preparation of a superabsorbent polymer (SAP). The obtained IA-GMA crosslinked SAP showed a high water absorbency under load (AUL) up to 23.9 g/g compared to commercial SAPs (14–18 g/g), so it can be a potential crosslinker for SAP preparation without a requirement of the surface treatment process as a time and energy-consuming process. Moreover, the application of IA-ECH, possessing hydroxyl or epoxy functionalities as an internal and surface crosslinker in the synthesis of SAPs was investigated. The unique ion structure of IA-ECH as an external crosslinker resulted in improvement in gel strength, as well as AUL up to 30.7 g/g. The SAPs crosslinked by IA-ECH as internal crosslinker presented a high water absorbency (Q_w) and saline absorbency (Q_s).

抽象的

衣康酸（IA）是一种生物基不饱和单体，由于其碳-碳双键的反应性低且缺乏均聚趋势，因此已被限制用于自由基聚合。在目前的工作中，IA用甲基丙烯酸甘油酯（GMA）或环氧氯丙烷（ECH）进行了改性，以分别合成两种新的基于IA的材料，即IA-GMA和IA-ECH。用¹表征交联剂后1 H NMR和FTIR，IA-GMA在结构中包含两个甲基丙烯酸酯基团用作内部交联剂，用于制备超吸收性聚合物（SAP）。与商用SAP（14-18 g / g）相比，所获得的IA-GMA交联SAP在负载下（AUL）的吸水率高达23.9 g / g，因此它可能是SAP制备中潜在的交联剂，而无需表面处理过程是耗时且耗能的过程。此外，研究了具有羟基或环氧官能团作为内部和表面交联剂的IA-ECH在SAP合成中的应用。IA-ECH作为外部交联剂的独特离子结构导致了凝胶强度以及高达30.7 g / g的AUL的改善。通过IA-ECH作为内部交联剂交联的SAP表现出高吸水率（Q_w）和盐水吸收率（Q _s）。