Abstract
In order to prepare excellent electro-responsive natural hydrogels, in this paper, soluble starch with large amount of hydroxyl groups was selected as raw material. For exploring the enhancement to electro-response of starch hydrogel, starch-Fe(III) composite hydrogels were successfully obtained by a combination of Fe(III) into starch hydrogel in this paper. The composite hydrogels were prepared as A-hydrogels cured in the presence of electric field and B-hydrogels which cured without electric field. The storage modulus of A-hydrogels and B-hydrogels was measured using a dynamic viscoelasticity spectrometer (DMA); the consequent modulus increment (ΔG = GA-GB) and modulus increment sensitivity (ΔG/GB) were analyzed for indicating electro-response of the hydrogels. The physical microstructure of the hydrogels was observed by scanning electron microscopy (SEM). Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA) were used to study the chemical constitution and structure. The results show that there is a coordinate bond between Fe(III) with –OH of starch which leads to a stronger three-dimensional network structure and higher thermal stability of the starch-Fe(III) hydrogel. What’s more, the electro-response of the hydrogels can be affected according to the Fe3+ concentration. When the Fe3+ concentration is 0.15 ~ 0.25 M under the electric field of 0.8 kV mm−1, the starch-Fe(III) hydrogels have the strongest electro-response, the maximum value of modulus increment (ΔG) is 24 kPa, and the modulus increment sensitivity (∆G/GB) is about 90%, far more than pure starch hydrogel.
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Funding
This work was supported by the Shaanxi Science and Technology Department, Key Research and Development Project under Grant No. 1203010328; projects of the Xi’an Modern Institute of Chemistry under Grant Contract No.204-J-2018-315-4/6, 204-J-2019-0387-3/6-6; and the Fundamental Research Funds for the Central Universities under Grant No. GK201903026.
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Wang, Y., Lin, M., Dai, W. et al. Enhancement of Fe(III) to electro-response of starch hydrogel. Colloid Polym Sci 298, 1533–1541 (2020). https://doi.org/10.1007/s00396-020-04736-y
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DOI: https://doi.org/10.1007/s00396-020-04736-y