期刊
POLYMERS
卷 10, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/polym10030333
关键词
polyurethane; regenerated silk fibroin; composite fibre; tubuliform silk; flat tensile stress-strain curve
资金
- National Natural Science Foundation of China [51373147]
- Science and Technology Planed Project of Guangdong Province [2016A050503013]
- Research Grants Council, University Grants Committee [PolyU 5158/13E]
Tubuliform silk is one of the seven different types of spider silks, which is well known for its unique tensile behaviour with Flat Tensile Stress-Strain (FTSS) curve. It is found that anisotropic microstructure of beta-sheets is responsible for this property. In recent years, bioinspired approaches to engineer fibres supported by modern manufacturing systems have been attracting considerable interest. The present paper aims to investigate a strategy to biomimic the FTSS behaviour of tubuliform silk in synthetic polymer composite fibres by blending polyurethane (PU) and regenerated silk fibroin (RSF) at different ratios. Wet spinning of composite fibres results in the reconstruction of beta-sheets in the synthetic fibre matrix. PU/RSF composite fibre at a ratio of 75/25 produce a tensile curve with FTSS characteristics. Secondary structural changes in RSF and interchain directions of beta-sheets within the fibre are studied using Fourier Transform Infra-red (FTIR) spectroscopy and Transmission Electron Microscopy (TEM), respectively. Interestingly, results of TEM patterns confirm transverse anisotropic properties of RSF beta-sheets. The composite fibres also display tuneable mechanical properties with respect to RSF contents.
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