期刊
POLYMERS
卷 11, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/polym11111899
关键词
aerogel fiber; silk fibroin; thermal insulation properties; multiscale pores; hollow fiber
资金
- Key Research and Development Plan Project of Anhui Province [1804a09020077]
- Science and Technology Plan Project of Wuhu city [2018pt04]
- Anhui Provincial Natural Science Foundation [1908085QE223]
- Graduate student practice and innovation project of Anhui Polytechnic University [2018-15]
- National innovation and entrepreneurship training program for college students [201910363031]
Aerogel fiber, with the characteristics of ultra-low density, ultra-high porosity, and high specific surface area, is the most potential candidate for manufacturing wearable thermal insulation material. However, aerogel fibers generally show weak mechanical properties and complex preparation processes. Herein, through firstly preparing a cellulose acetate/polyacrylic acid (CA/PAA) hollow fiber using coaxial wet-spinning followed by injecting the silk fibroin (SF) solution into the hollow fiber, the CA/PAA-wrapped SF aerogel fibers toward textile thermal insulation were successfully constructed after freeze-drying. The sheath (CA/PAA hollow fiber) possesses a multiscale porous structure, including micropores (11.37 +/- 4.01 mu m), sub-micron pores (217.47 +/- 46.16 nm), as well as nanopores on the inner (44.00 +/- 21.65 nm) and outer (36.43 +/- 17.55 nm) surfaces, which is crucial to the formation of a SF aerogel core. Furthermore, the porous CA/PAA-wrapped SF aerogel fibers have many advantages, such as low density (0.21 g/cm(3)), high porosity (86%), high strength at break (2.6 +/- 0.4 MPa), as well as potential continuous and large-scale production. The delicate structure of multiscale porous sheath and ultra-low-density SF aerogel core synergistically inhibit air circulation and limit convective heat transfer. Meanwhile, the high porosity of aerogel fibers weakens heat transfer and the SF aerogel cellular walls prevent infrared radiation. The results show that the mat composed of these aerogel fibers exhibits excellent thermal insulating properties with a wide working temperature from -20 to 100 degrees C. Therefore, this SF-based aerogel fiber can be considered as a practical option for high performance thermal insulation.
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