Preparation and properties of color-changing hydrogel with dual-stimulation response to temperature and pH
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 ΔTsol was 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.
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