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Open AccessArticle

Microstructure Transitions and Dry-Wet Spinnability of Silk Fibroin Protein from Waste Silk Quilt

by Xin Zhang 1 and Zhijuan Pan 1,2,*
1
College of Textile and Clothing Engineering, Soochow University, Suzhou 215021, China
2
National Engineering Laboratory for Modern Silk, Soochow University, Suzhou 215123, China
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(10), 1622; https://doi.org/10.3390/polym11101622
Received: 28 August 2019 / Revised: 26 September 2019 / Accepted: 2 October 2019 / Published: 8 October 2019
With excellent biocompatibility and biodegradability, silk fibroin has been developed into many protein materials. For producing regenerated silk fibroin (RSF) fibers, the conformation transition of silk fibroin needs to be thoroughly studied during the spinning process. Since the many silk fabrics that are discarded comprise an increasing waste of resources and increase the pressure on the environment, in this paper, waste silk fiber was recycled in an attempt to prepare regenerated fibroin fiber by dry-wet spinning. Ethanol was the coagulation bath. The rheological properties of all the RSF solutions were investigated to acquire rheology curves and non-Newtonian indexes for spinnability analysis. Four stages of the spinning process were carried out to obtain RSF samples and study their conformation transitions, crystallization, and thermal properties by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, and differential scanning calorimetry. Quantitative analysis of the FTIR results was performed to obtain specific data regarding the contents of the secondary structures. The results showed that higher concentration spinning solutions had better spinnability. As the spinning process progressed, random coils were gradually converted into β-sheets and crystallization increased. Among the different influencing factors, the ethanol coagulation bath played a leading role in the conformation transitions of silk fibroin. View Full-Text
Keywords: waste silk; regenerated silk fibroin; conformation transition; quantitative analysis; dry-wet spinning waste silk; regenerated silk fibroin; conformation transition; quantitative analysis; dry-wet spinning
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MDPI and ACS Style

Zhang, X.; Pan, Z. Microstructure Transitions and Dry-Wet Spinnability of Silk Fibroin Protein from Waste Silk Quilt. Polymers 2019, 11, 1622.

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