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Characteristics, Compression, and Buffering Performance of Pomelo-Like Hierarchical Capsules Containing Shear Thickening Fluid

1,2, 1, 1,*, 1, 3, 2,3,4,5,6,* and 1,2,3,6,7,8,9,*
1
Innovation Platform of Intelligent and Energy-Saving Textiles, School of Textile Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China
2
Fujian Key Laboratory of Novel Functional Fibers and Materials, Minjiang University, Fuzhou 350108, China
3
Department of Chemical Engineering and Materials, Ocean College, Minjiang University, Fuzhou 350108, China
4
Department of Bioinformatics and Medical Engineering, Asia University, Taichung 41354, Taiwan
5
Department of Medical Research, China Medical University Hospital, China Medical University, Taichung 40402, Taiwan
6
College of Textile and Clothing, Qingdao University, Shandong 266071, China
7
Laboratory of Fiber Application and Manufacturing, Department of Fiber and Composite Materials, Feng Chia University, Taichung 40724, Taiwan
8
Department of Fashion Design, Asia University, Taichung 41354, Taiwan
9
School of Chinese Medicine, China Medical University, Taichung 40402, Taiwan
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(7), 1138; https://doi.org/10.3390/polym11071138
Received: 29 April 2019 / Revised: 12 June 2019 / Accepted: 24 June 2019 / Published: 3 July 2019
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Abstract

In this study, a double-walled and pomelo-like hierarchical shear thickening fluid (STF) is successfully encapsulated using the simple and environment-friendly calcium alginate encapsulation technique by instilling STF into sodium alginate (SA) and crosslinking by calcium chloride solution. The encapsulated STF has a pomelo-like structure with a shell thickness of 2.9 μm and core pores with a size of 21.43 μm. The effect of the size of STF capsules (2.10, 1.89, 1.86, 1.83, 1.73, and 1.63 mm) is explored in terms of thermal stability, swelling capacity, mechanical property, and release performance. The buffering performance of different sizes of STF-containing capsules is also investigated. The pomelo-like STF capsules can withstand a processing temperature of 250 °C. With a decrease in particle size, the compression strain energy slowly increases first and then rapidly enhances. The kinetic release of pomelo-like STF capsules conforms to Fickian diffusion. STF-containing capsules with a diameter of 1.83 mm present the greatest thermal stability, the highest STF amount, the maximum swelling coefficient, and the fastest kinetic diffusion. STF-containing capsules also have an improved buffering performance in PU foam. This capsule has the best comprehensive performance and can adapt to diversified applications, such as personnel armor and other protective sports equipment. View Full-Text
Keywords: pomelo-like capsules; hierarchical structure; shear thickening fluid; size regulation; compression response pomelo-like capsules; hierarchical structure; shear thickening fluid; size regulation; compression response
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Li, T.-T.; Huo, J.; Liu, X.; Wang, H.; Shiu, B.-C.; Lou, C.-W.; Lin, J.-H. Characteristics, Compression, and Buffering Performance of Pomelo-Like Hierarchical Capsules Containing Shear Thickening Fluid. Polymers 2019, 11, 1138.

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