Incorporation of graphene into photopolymerizable hydrogels of N-acyl glutanamides: Rheological and swelling behavior study of soft nanocomposite materials
Incorporation of graphene into photopolymerizable hydrogels of N-acyl glutanamides: Rheological and swelling behavior study of soft nanocomposite materials
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DOI：
10.1016/j.polymer.2012.11.052
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发表时间：
2013-02
期刊：
影响因子：
4.6
通讯作者：
Frédéric Delbecq;H. Endo;Fumihiko Kono;A. Kikuchi;T. Kawai
中科院分区：
文献类型：
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作者：
Frédéric Delbecq;H. Endo;Fumihiko Kono;A. Kikuchi;T. Kawai
分别制备了两种不同的 N-硬脂酰和二乙炔脂肪酰基谷氨酰胺，并将其用作有效的低分子量水凝胶剂 (LMWG)。这些化合物能够以 1.0 wt% 的浓度使水凝胶化，与 pH 值无关。由于胶凝剂末端存在两个游离氨基，氧化石墨烯（GO）的水性胶体分散体可以简单地通过离子键稳定在水凝胶基质中。流变学研究证实，凝胶网络中包含少量 GO 增加了其自然刚性。处理后可原位还原 GO，这是一种含有还原石墨烯 (rGO) 的半透明水凝胶，可以轻松操作而不会出现明显的脱水收缩现象。当含有GO的二乙炔型水凝胶受到紫外光照射时，观察到深蓝色的变色；有效光聚合的证据。在对所得蓝色聚二乙炔（PDA）水凝胶进行热刺激的情况下，该材料在室温下转变为坚固的红色（PDA）水凝胶的红色溶液前体。这种红色水凝胶从未表现出可逆的颜色变化，并且在不同温度下研究了其溶胀行为。所有水凝胶都通过不同的方法进行表征，例如场发射扫描电子显微镜（FE-SEM）用于确定凝胶网络的均匀性，还可以通过（FT-IR）傅立叶变换红外光谱和紫外可见测量。
Two different respectively N-stearoyl and diacetylenic fatty acyl glutanamide were prepared and employed as both potent low molecular weight hydrogelators (LMWGs). These compounds were able to gelate water at 1.0 wt% of concentration independently of the pH. Due to the presence of two free amino groups on the extremities of the gelator, an aqueous colloidal dispersion of graphene oxide (GO) could be stabilized into the hydrogel matrix simply by ionic bonds. The inclusion of a slightly amount of GO inside the gel networks increased its natural rigidity, confirmed by rheology study. An in-situ reduction of GO afforded after treatment, a semi-transparent hydrogel containing reduced graphene (rGO) that could be easily manipulated without apparent syneresis phenomenon. When the diacetylenic type hydrogel containing GO was irradiated upon UV light, a deep blue coloration change was observed; evidence of an effective photopolymerization. In case of thermal stimulation of the resulted blue polydiacetylene (PDA) hydrogel, the material turned in a red solution precursor of a robust red (PDA) hydrogel at room temperature. This red hydrogel never displayed reversible color change and its swelling behavior was studied at different temperatures. All hydrogels were characterized by different methods such as Field-Emission Scanning Electron Microscopy (FE-SEM) for determining the homogeneity of the gel networks, but also by (FT-IR) Fourier Transform-Infrared spectroscopy and UV–visible measurement.