期刊
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
卷 57, 期 22, 页码 1506-1515出版社
WILEY
DOI: 10.1002/polb.24895
关键词
beta-sheet structure; composites; conformation transition; crystallization; Fourier self-deconvolution analysis; graphene oxide; microstructure; silk fibroin
资金
- Fundamental Research Funds for National Natural Science Foundation of China [5150306, 551273065]
Regenerated silk fibroin (RSF)/graphene oxide (GO) nanocomposite has been substantially investigated due to its significant multifunctional potential. Here, in combination of micromorphology, crystalline conformation, dynamic mechanical property characterization, and Fourier self-deconvolution (FSD) quantitative analysis, we investigated the RSF molecular chains conformation transition induced by GO nanosheet incorporation, and its influence on the structural and mechanical properties of solution casted RSF/GO composite films. The GO nanosheet promoted the silk fibroin molecular chains conformation transition from random coil to beta-sheet structure, and a correlation between beta-sheet structure fraction and GO concentration was revealed. The beta-sheet structure fraction increases further improved the dynamic mechanical property of composite films. Moreover, based on nucleation-dependent aggregation of silk fibroin molecular chains, a mechanism considering the competition effect between GO concentration and its total surface area was proposed to explain the observed concentration-dependent conformation transition phenomenon. The study improves our understanding on silk fibroin conformation transition process in RSF/GO composite and would provide a valuable reference for the rational design of bioinspired multifunctional materials with enhanced mechanical properties. (c) 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019
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