In this paper, a series of novel poly(methacrylic acid)/laponite RDS (PMAA/Lap RDS) nanocomposite hydrogels crosslinked by N,N’-methylene bisacrylamide were synthesized via free radical polymerization by using potassium persulfate as initiator. The main novelty of this paper refers to the detail investigation of how the laponite RDS influenced of the pKa, and consequently, the water-uptake of these nanocomposites. In parallel, the evidence of incorporation and interactions of the materials was confirmed by scanning electron microscopy and Fourier transform infrared spectra techniques. By the X-ray diffraction technique (XRD), it was possible to confirm the exfoliation/intercalation configuration of the nanoclay laponite RDS (Lap RDS) into the PMAA matrix. Hydrophilic properties, measured by swelling degree (SD), indicated that the presence of Lap RDS influenced the water uptake capability of the nanocomposite, reaching a maximum of 91 ± 2 g/g for nanocomposites constituted by 5 % of nanoclay. Besides, the pKa of the nanocomposite can be adjusted by nanoclay content. In this way, the ability of these hydrogels to respond to pH values can be useful to act as trigger in controlled release systems.

本文研究了一系列通过N，N交联的新型聚（甲基丙烯酸）/膨润土RDS（PMAA / Lap RDS）纳米复合水凝胶以过硫酸钾为引发剂，通过自由基聚合反应合成了'-亚甲基双丙烯酰胺。本文的主要新颖之处在于详细研究了皂石RDS如何影响pKa，进而影响了这些纳米复合材料的吸水率。同时，通过扫描电子显微镜和傅立叶变换红外光谱技术证实了材料结合和相互作用的证据。通过X射线衍射技术（XRD），可以确认纳米粘土皂石RDS（Lap RDS）在PMAA基质中的剥离/嵌入构型。通过溶胀度（SD）衡量的亲水性表明，Lap RDS的存在影响了纳米复合材料的吸水能力，对于由5％的纳米粘土组成的纳米复合材料，其最大含量可达91±2 g / g。此外，可以通过纳米粘土的含量来调节纳米复合材料的pKa。以这种方式，这些水凝胶响应pH值的能力可以用作控释系统中的触发剂。