The SA/TA-Fe3+fiber with near-infrared photo-thermal responsive behavior was prepared by wet spinning of the blending solutions of tannic acid-iron composites and sodium alginate(SA).The effects of molar ratios of FeCl3 to TA on the rheological properties of SA/TA-Fe3+spinning solution and the mechanical and photo-thermal responsive behaviors of SA/TA-Fe3+fiber were studied.The properties of SA/TA-Fe3+fibers were characterized by single fiber strength machine,FT-IR,scanning electron microscopy and infrared thermal imaging analysis.The results showed that the content of TA-Fe3+composites scarcely changed the viscosity of the spinning solution.The breaking strength of SA/TA-Fe3+fibers was above 2.1 cN/dtex.With the increase of TA-Fe3+content,the near-infrared photo-thermal responsive behavior of the composite fiber was more sensitive.The requirements of elevating the temperature of SA/TA-Fe3+fiber for different applications could be satisfied by adjusting the addition of TA-Fe3+composites.
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