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EnglishB. mori silk fibroin fibres grafted with methacrylamide (MAA) were characterized by Raman and IR spectroscopy before and after alkaline hydrolysis. Upon grafting, the fibres underwent conformational rearrangements towards a more unordered state, while at weight gains higher than 60% they lost also the orientation. Upon hydrolysis, silk fibroin resulted enriched in β-sheet conformation, due to the preferential removal of the unordered domains, more prone to the alkaline attack. As a result of the interactions with the silk fibroin, the polymer increased its stability towards alkaline hydrolysis; in the presence of the fibres, the complete solubilization of the polymer is avoided. The A731/A1004 Raman ratio proved to be a suitable parameter to evaluate the composition of the grafted samples; its value linearly increases with weight gain (R2 = 0.998). Vibrational spectroscopy resulted a valid technique to investigate the mechanism and the effects of the hydrolytic attack, both fundamental for the designing of new-generation silk-based materials.
| Titolo: | Structural characterisation of B. mori silk fibroin fibres grafted with methacrylamide and their stability towards alkaline hydrolysis | |
| Autore/i: | PAVONI, ELEONORA; TADDEI, PAOLA; Tsukada, M. | |
| Autore/i Unibo: | ||
| Anno: | 2015 | |
| Titolo del libro: | Proceedings of the XV Sigma-Aldrich Young Chemists Symposium (SAYCS 2015) | |
| Pagina iniziale: | 156 | |
| Pagina finale: | 156 | |
| Abstract: | B. mori silk fibroin fibres grafted with methacrylamide (MAA) were characterized by Raman and IR spectroscopy before and after alkaline hydrolysis. Upon grafting, the fibres underwent conformational rearrangements towards a more unordered state, while at weight gains higher than 60% they lost also the orientation. Upon hydrolysis, silk fibroin resulted enriched in β-sheet conformation, due to the preferential removal of the unordered domains, more prone to the alkaline attack. As a result of the interactions with the silk fibroin, the polymer increased its stability towards alkaline hydrolysis; in the presence of the fibres, the complete solubilization of the polymer is avoided. The A731/A1004 Raman ratio proved to be a suitable parameter to evaluate the composition of the grafted samples; its value linearly increases with weight gain (R2 = 0.998). Vibrational spectroscopy resulted a valid technique to investigate the mechanism and the effects of the hydrolytic attack, both fundamental for the designing of new-generation silk-based materials. | |
| Data stato definitivo: | 29-giu-2016 | |
| Appare nelle tipologie: | 4.02 Riassunto (Abstract) |
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