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Preparation and Formation Mechanism Analysis of Regenerated Silk Fibroin/Polyvinyl Alcohol Blended Fibers with Waste Silk Quilt

Preparation and Formation Mechanism Analysis of Regenerated Silk Fibroin/Polyvinyl Alcohol... In the context of environmental protection, the various waste textiles have caused considerable contamination and aroused extensive concern worldwide. This paper used waste silk products to fabricate the regenerated silk fibroin(RSF)/polyvinyl alcohol(PVA) blended fibers by the dry-wet spinning method. The spinning dope was the 20 wt% RSF/PVA (4/6) blended aqueous solutions, and the coagulation bath was non-toxic and harmless ethanol. We explored fibers’ microstructure transformation at different spinning stages, forming mechanism, and structure and performance under different spinning parameters. The results showed that as the spinning process progressed, the β-sheet structure content and molecular chain orientation of fibers increased gradually from 30.8 % to 48.9 % and from 0.81 to 1.26, respectively. The solution experienced slight shear action in the spinning tube and then coagulated to cylindrical fibers immediately in the coagulation bath. With the extension of coagulation time, the impermeable skin structure and the stable network core structure locked the internal moisture, resulting in a gradually numerous internal pores. The increasing drawing speed ratio could reduce fibers’ diameter and porosity while the growing coagulation time witnessed an improvement of microstructure. The porosity could be precisely modified. Under the optimum spinning parameters (drawing speed ratio of 1.2 and coagulation time of 60 s), the as-spun fibers had the breaking stress, initial modulus, and breaking strain of 0.29±0.04 cN/dtex, 12.22±2.55 cN/dtex, and 439±129 %, respectively. The fibers in this paper have high feasibility for subsequent secondary processing and show broad application prospects in the biomedical field. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Fibers and Polymers Springer Journals

Preparation and Formation Mechanism Analysis of Regenerated Silk Fibroin/Polyvinyl Alcohol Blended Fibers with Waste Silk Quilt

Zhang, Xin; Pan, Zhijuan
Fibers and Polymers , Volume 23 (8) – Aug 1, 2022
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13 pages

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Publisher
Springer Journals
Copyright
Copyright © The Korean Fiber Society 2022
ISSN
1229-9197
eISSN
1875-0052
DOI
10.1007/s12221-022-4035-1
Publisher site
See Article on Publisher Site

Abstract

In the context of environmental protection, the various waste textiles have caused considerable contamination and aroused extensive concern worldwide. This paper used waste silk products to fabricate the regenerated silk fibroin(RSF)/polyvinyl alcohol(PVA) blended fibers by the dry-wet spinning method. The spinning dope was the 20 wt% RSF/PVA (4/6) blended aqueous solutions, and the coagulation bath was non-toxic and harmless ethanol. We explored fibers’ microstructure transformation at different spinning stages, forming mechanism, and structure and performance under different spinning parameters. The results showed that as the spinning process progressed, the β-sheet structure content and molecular chain orientation of fibers increased gradually from 30.8 % to 48.9 % and from 0.81 to 1.26, respectively. The solution experienced slight shear action in the spinning tube and then coagulated to cylindrical fibers immediately in the coagulation bath. With the extension of coagulation time, the impermeable skin structure and the stable network core structure locked the internal moisture, resulting in a gradually numerous internal pores. The increasing drawing speed ratio could reduce fibers’ diameter and porosity while the growing coagulation time witnessed an improvement of microstructure. The porosity could be precisely modified. Under the optimum spinning parameters (drawing speed ratio of 1.2 and coagulation time of 60 s), the as-spun fibers had the breaking stress, initial modulus, and breaking strain of 0.29±0.04 cN/dtex, 12.22±2.55 cN/dtex, and 439±129 %, respectively. The fibers in this paper have high feasibility for subsequent secondary processing and show broad application prospects in the biomedical field.

Journal

Fibers and Polymers – Springer Journals

Published: Aug 1, 2022

Keywords: Waste silk; Regenerated silk fibroin; Blended fibers; Forming mechanism; Microstructure

References