Structure and properties of novel electrospun tussah silk fibroin/poly(lactic acid) composite nanofibers |
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Authors: | Jianxin He Yongrui Qin Shizhong Cui Yaying Gao Shanyuan Wang |
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Affiliation: | (1) College of Textiles, Donghua University, Shanghai, 201620, People’s Republic of China;(2) Henan Key Laboratory of Textile Materials, Zhongyuan University of Technology, Zhengzhou, 450007, People’s Republic of China |
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Abstract: | The tussah silk fibroin (TSF)/poly(lactic acid) (PLA) composite nanofibers with different composition ratios were prepared
by electrospinning with 1,1,1,3,3,3-Hexafluoro-2-propanol as the solvent. The morphology and secondary structure of the fibers
were characterized by Scanning electronic microscope, Fourier transform infrared (FTIR), and X-ray diffraction (XRD). The
thermal and mechanical tests were also performed. The spinnability of TSF solution was improved significantly through adding
10% PLA, and the average diameter of the fibers decreased from 583 nm to 178 nm with an obvious improvement in fiber diameter
uniformity. In addition, the mechanical properties of electrospun nanofibers increased evidently after blending 10% PLA, whereas
the thermal properties kept stable. FTIR and XRD analysis indicated the addition of 5% PLA could induce a conformation transformation
of TSF from random coil and α-helix to β-sheet, however, when PLA content was more than 10%, the β-sheet structure of TSF
in composite nanofibers decreased, and the phase separation of two compositions occurred. Therefore, when PLA content exceeded
15%, the average diameters of TSF/PLA composite nanofibers increased and appeared to be polarized, moreover, the mechanical
properties of the fibers decreased with the increase of PLA content, and the fibers displayed the mechanical behavior of PLA
component more. |
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