温度与pH双重刺激响应变色水凝胶的制备及性能

doi:10.16085/j.issn.1000-6613.2023-1958

摘要/Abstract

摘要：

以十二烷基苯磺酸钠（SDBS）和N-异丙基丙烯酰胺（NIPAm）为原料，通过自由基聚合法成功制备了具有温度和pH双刺激响应的复合变色水凝胶（SPS）。SPS水凝胶具有更高的温度敏感性，当变温区间为10~40℃时，复合水凝胶的可见光透光率随着环境温度呈现线性变化，变色前后太阳光调制率ΔT_sol高于85.78%。由于SDBS在酸性环境中（pH≤2）的溶解度大大降低，复合水凝胶兼具pH变色响应的功能。此外，SPS水凝胶比添加其他阴离子表面活性剂如十二烷基硫酸钠（SDS）的SPN水凝胶具有更高的太阳光调制能力和可见光透过率。因此，相对于传统的PNIPAm水凝胶，SPS复合水凝胶具有高太阳光调制率、线性温度响应和多刺激变色等优势，为智能变色水凝胶提供了更广泛的应用场景。

关键词: 水凝胶, 十二烷基苯磺酸钠, 热致变色, 表面活性剂, 相变温度, pH响应

Abstract:

In this work, composite color-changing hydrogels (SPS) with dual-stimulation response to temperature and pH were successfully prepared by free radical polymerization using sodium dodecylbenzene sulfonate (SDBS) and N-isopropylacrylamide (NIPAm) as the raw materials. The SPS hydrogel had higher temperature sensitivity, and the visible light transmittance of the composite hydrogel showed a linear change with the ambient temperature when the temperature-variable interval was 10—40℃, and the solar modulation rate ΔT_solwas higher than 85.78% before and after discoloration. The composite hydrogel also functioned as a pH discoloration response due to the greatly reduced solubility of SDBS in acidic environments (pH≤2). In addition, the SPS hydrogel had higher solar modulation and visible light transmittance than the SPN hydrogel with the addition of other anionic surfactants such as sodium dodecyl sulfate (SDS). Therefore, compared with the traditional PNIPAm hydrogels, SPS composite hydrogels had the advantages of high solar modulation rate, linear temperature response and multi-stimulus color change, which provided a wider range of application scenarios for smart color-changing hydrogels.

Key words: hydrogels, sodium dodecylbenzene sulfonate, thermochromic, surfactants, phase change temperature, pH response

中图分类号:

O632.6

郑佳, 刘一鸣, 许利刚, 姚琳. 温度与pH双重刺激响应变色水凝胶的制备及性能[J]. 化工进展, 2024, 43(12): 6811-6819.

ZHENG Jia, LIU Yiming, XU Ligang, YAO Lin. Preparation and properties of color-changing hydrogel with dual-stimulation response to temperature and pH[J]. Chemical Industry and Engineering Progress, 2024, 43(12): 6811-6819.

图/表 9

图1 热致变色水凝胶的机理示意图

图2 在低温（10℃）和高温（60℃）下的PNIPAm、SPS-3和SPN-3的SEM图

图3 不同温度下PNIPAm、SPS-3和SPS-5水凝胶的太阳透过率光谱

图4 SPS凝胶分别在低温下和在高温下的响应机理图

图5 在不同温度（10℃、20℃、30℃和40℃）下SPS-3和SPS-5水凝胶的变色照片

图6 不同温度下PNIPAm和SPS-3水凝胶在550nm波长处的太阳透过率

图7 PNIPAm、SPS-3和SPS-5的水凝胶的DSC曲线

图8 SPS-3水凝胶分别在去离子水（pH=7）、相同浓度的盐酸溶液（pH=0）和在氢氧化钠溶液（pH=14）响应的照片

图9 不同温度下SPN-3的太阳透过率光谱

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