Key Laboratory of Intelligent Textile and Flexible Interconnection of Zhejiang Province, Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, 310018 Hangzhou, China.
Technical University of Munich, TUM School of Natural Sciences, Department of Physics, Chair for Functional Materials, James-Franck-Str. 1, 85748 Garching, Germany; Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany.
Int J Biol Macromol. 2024 May;268(Pt 2):131638. doi: 10.1016/j.ijbiomac.2024.131638. Epub 2024 Apr 24.
Due to the poor UV protection capability, natural silk fabrics not only suffer from easy damage by sunshine but also induce possible sunburn in the human body. Efficient azobenzene isomerization and enhanced UV shielding are realized by replacing the natural silk with natural protein silk fibroin (SF) and electrospinning together with light-responsive copolymer P(MEO-co-OEG-co-AHMA). Compared to a solution cast film, the absorption peak intensity at 355 nm is 60 % higher in UV-Vis spectra of the electropsun SF/P(MEO-co-OEG-co-AHMA) fabrics. This improvement is related to the highly oriented chains, inducing more space and higher efficiency for azobenzene isomerization. Only exposure to visible light for 20 min, the absorption peak corresponding to the trans- state at 355 nm recovers to 92.5 % in the electrospun fabrics, which is at least 100 % faster than that in the solution cast film (50 min). It is related to the zip effect of the isomerization in the oriented chain structure. Thus, not only the absorption of UV radiation, but also the isomerization rate is enhanced. Based on these unique absorption and recovery capabilities, the SF based electrospun fabrics can be used to replace the natural silk fabrics for UV shielding in summer, especially for cyclic use.
由于天然丝织物的紫外线防护能力较差，不仅容易受到阳光的损害，还会导致人体晒伤。通过用天然蛋白丝素（SF）取代天然丝，并与光响应共聚物 P（MEO-co-OEG-co-AHMA）进行静电纺丝，实现了高效的偶氮苯异构化和增强的紫外线屏蔽。与溶液浇铸膜相比，静电纺丝 SF/P（MEO-co-OEG-co-AHMA）织物的紫外可见光谱中在 355nm 处的吸收峰强度提高了 60%。这种改善与高度取向的链有关，为偶氮苯异构化提供了更多的空间和更高的效率。仅在可见光下暴露 20 分钟，静电纺丝织物中 355nm 处对应反式态的吸收峰就恢复到 92.5%，这比溶液浇铸膜（50 分钟）快至少 100%。这与取向链结构中异构化的拉链效应有关。因此，不仅增强了对紫外辐射的吸收，而且还提高了异构化速率。基于这些独特的吸收和恢复能力，基于 SF 的静电纺丝织物可用于替代天然丝织物在夏季进行紫外线屏蔽，特别是可循环使用。
