Abstract Novel hydrogels with phosphoric acid-bearing units suitable for agricultural applications have been obtained. Introducing phosphate moieties into acrylate-based hydrogels could result in better swelling properties, especially under acidic conditions as the dissociation constants of phosphoric acid are much lower than that of acrylic acid. The presence of phosphate groups could also increase hydrogels’ biocompatibility and biodegradability, what in the case of agricultural application may be of great advantage. Presented hydrogels, besides acting as a water reservoir, have a potential to be an additional source of phosphorus - preliminary studies confirmed phosphate release as a result of hydrolysis. To obtain novel hydrogels, two organophosphorus compounds were chosen: 2-(methacryloyloxy)ethyl phosphate (MEP) acting as functional monomer and bis[2-(methacryloyloxy)ethyl] phosphate (BMEP) acting as a crosslinking agent. To the best of our knowledge, the use of these monomers in combination with acrylic acid has not been reported earlier in hydrogel synthesis. Hydrogels with nominal BMEP and MEP concentration 0.5–5.0 wt.% and 1.0–4.0 wt.%, respectively and water regain ranging from 105.5 g/g up to 2837.5 g/g were obtained. Swelling properties and response to different stimuli (pH, ionic strength etc.) were determined, indicating that synthesized materials could be successfully applied in agriculture. Moreover, obtained results gave new information about the properties of MEP, BMEP, products of their polymerization and, simultaneously, on their potential applications.

中文翻译：

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用于农业应用的新型丙烯酸酯/有机磷基水凝胶。使用 2-（甲基丙烯酰氧基）磷酸乙酯作为多用途单体的新前景和创新概念

摘要 已获得适用于农业应用的具有含磷酸单元的新型水凝胶。将磷酸盐部分引入丙烯酸酯基水凝胶可以产生更好的溶胀性能，尤其是在酸性条件下，因为磷酸的解离常数远低于丙烯酸的解离常数。磷酸盐基团的存在还可以提高水凝胶的生物相容性和生物降解性，这在农业应用的情况下可能具有很大的优势。所提出的水凝胶除了作为蓄水池外，还有可能成为磷的额外来源——初步研究证实了水解导致磷酸盐释放。为了获得新型水凝胶，选择了两种有机磷化合物：2-（甲基丙烯酰氧基）乙基磷酸酯（MEP）作为功能单体，双[2-（甲基丙烯酰氧基）乙基]磷酸酯（BMEP）作为交联剂。据我们所知，这些单体与丙烯酸结合使用在水凝胶合成中的早期尚未报道过。获得了标称 BMEP 和 MEP 浓度分别为 0.5-5.0 wt.% 和 1.0-4.0 wt.% 的水凝胶，水回潮率范围为 105.5 g/g 至 2837.5 g/g。确定了膨胀特性和对不同刺激（pH、离子强度等）的响应，表明合成材料可以成功地应用于农业。此外，获得的结果提供了关于 MEP、BMEP 的性质、它们的聚合产物以及它们潜在应用的新信息。