Study on the viscoelastic response of silk

Parthasarathy, K. M.; Naresh, M. D.; Arumugam, V.; Subramaniam, V.; Sanjeevi, R.

doi:10.1002/(sici)1097-4628(19960328)59:13<2049::aid-app9>3.3.co;2-x

Cited by 3 publications

(6 citation statements)

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“…Thus, among the wide variety of silks available in nature, the cocoon silk produced by Bombyx mori has been investigated the most extensively. [5][6][7][8][9][10] Bombyx mori silk comprises about 65-70% crystalline material, with the remaining 30-35% material being amorphous with hydrogen-bond linkages. 6 Early X-ray diffraction analysis 11 implied that the molecules in the crystalline regions must be present as extended chains in a zigzag form with an axial repeat of 0.7 nm, corresponding to two amino acid residues.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Structure/Property Relationships in Silkworm (Bombyx mori) and Spider Dragline (Nephila edulis) Silks Using Raman Spectroscopy

et al. 2003

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The molecular deformation of both silkworm (Bombyx mori) and spider dragline (Nephila edulis) silks has been studied using a combination of mechanical deformation and Raman spectroscopy. The stress/strain curves for both kinds of silk showed elastic behavior followed by plastic deformation. It was found that both materials have well-defined Raman spectra and that some of the bands in the spectra shift to lower frequency under the action of tensile stress or strain. The band shift was linearly dependent upon stress for both types of silk fiber. This observation provides a unique insight into the effect of tensile deformation upon molecular structure and the relationship between structure and mechanical properties. Two similar bands in the Raman spectra of both types of silk in the region of 1000-1300 cm(-1) had significant identical rates of Raman band shift of about 7 cm(-1)/GPa and 14 cm(-1)/GPa demonstrating the similarity between the silk fibers from two different animals.

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Section: Introductionmentioning

confidence: 99%

Analysis of Structure/Property Relationships in Silkworm (Bombyx mori) and Spider Dragline (Nephila edulis) Silks Using Raman Spectroscopy

et al. 2003

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“…In literature, there are many researches to determine mechanical properties and deformation process of silk filaments and yarns under different factors such as temperature and relative humidity,7, 9, 17–22 as well as a few studies devoted to examine stress‐relaxation and creep‐recovery properties of silk yarns 1, 19, 23–26. However, there is almost no research that estimates how tensile characteristics of silk fibre changes after the application of pre‐extension at different levels.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of Bombyx mori silk yarns studied with tensile testing method

Aksakal

Tsobkallo

Darvish

2009

J of Applied Polymer Sci

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The mechanical properties of Bombyx mori silk yarns and baves were investigated with tensile testing method. After silk yarns were pre-extended at different strain levels and fixed for a while followed by recovery process, the tensile characteristics were examined in detail. It was commonly observed that low preliminary extensions up to 2-3% do not cause the changes of the mechanical properties and stress-strain curves because they result in small structural changes and distortions, which were recovered within relatively short time ($ 1 min) in recovery process. However, pre-extension values >3% strain lead to great changes of the mechanical properties and fibre structure, i.e., the changes of the shape of stressstrain curve where additional transition point was observed, increase in the rigidity and stress at rupture, but decrease in extensibility as a result of orientation and destruction of the fibre structure especially in the amorphous region. It was stated that silk fibre consists of two distinct deformation regions, namely first linear region extending up to 2-3% strain and the second region beyond 2-3% strain where the main reorganization processes of the fibre structure, that is, the straining of macromolecular chains especially in the amorphous regions, the orientation of structural units such as b-sheet microcrystals in stretching direction, and the destruction of macromolecules take place.

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“…Silk fiber from Bombyx mori has been widely investigated because of its mechanical properties, spinning mechanisms, and molecular structures. It has been investigated using various methods, including rheological, [1][2][3][4][5][6] spectroscopical, [7][8][9][10][11][12][13][14][15][16][17][18][19][20] and biological methods. [21][22][23][24][25][26] Many attempts were made to chemically [27][28][29][30][31][32][33] and genetically 22,25,26,34 synthesize fibers such as silk fibers, but these failed to succeed in producing satisfactory fibers with comparable properties.…”

mentioning

confidence: 99%

“…Silk fiber from Bombyx mori has been widely investigated because of its mechanical properties, spinning mechanisms, and molecular structures. It has been investigated using various methods, including rheological, − spectroscopical, − and biological methods. − Many attempts were made to chemically − and genetically ,,, synthesize fibers such as silk fibers, but these failed to succeed in producing satisfactory fibers with comparable properties. There are still many basic issues on fibroin structure and spinning dynamics, which play important roles but are not yet fully understood by scientists.…”

mentioning

confidence: 99%

“…There are still many basic issues on fibroin structure and spinning dynamics, which play important roles but are not yet fully understood by scientists. The natural fibroin spinning process involves many conditional changes, such as changes in pH, ,,, in fibroin concentration, in shearing force, − , and in metal ions, , which, in turn, result in the fibroin structural changes occurring gradually from the soluble helix conformation to the insoluble β-sheet conformation. These β-sheets are well-oriented along the axis of the fiber, giving it the strength and stiffness comparable or even superior to those of high-performance synthetic materials.…”

mentioning

confidence: 99%

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Generalized Two-Dimensional Correlation Analysis of NMR and Raman Spectra for Structural Evolution Characterizations of Silk Fibroin

Zhou

Noda

et al. 2006

J. Phys. Chem. B

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Generalized two-dimensional (2D) correlation spectroscopy was used to characterize the structural evolution of silk fibroin as the pH changed from 6.8 to 4.8, demonstrating that the conformational transitions of silk fibroin are induced step by step as the pH decreases. 2D homo- and hetero-spectral correlation spectroscopy was used to establish the relationship between information extracted from NMR and Raman spectroscopy. This novel method reveals the structural evolution using two probes with different frequency scales (10(5-9) Hz for nuclear spin motion and 10(12-14) Hz for molecular vibration motion), reflecting the different spatial scale sensitivity to the molecular conformational change. The transition order is identified as silk I state (helix dominant) --> silk I intermediate state --> silk II intermediate state --> silk II state (beta-sheet dominant), as the pH decreases. The results may rationalize the silkworm spinning process, which undergoes the conformational transition steadily from the soluble helix state to the insoluble beta-sheet state as the pH decreases from the posterior to anterior glands.

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Study on the viscoelastic response of silk

Cited by 3 publications

References 0 publications

Analysis of Structure/Property Relationships in Silkworm (Bombyx mori) and Spider Dragline (Nephila edulis) Silks Using Raman Spectroscopy

Analysis of Structure/Property Relationships in Silkworm (Bombyx mori) and Spider Dragline (Nephila edulis) Silks Using Raman Spectroscopy

Mechanical properties of Bombyx mori silk yarns studied with tensile testing method

Generalized Two-Dimensional Correlation Analysis of NMR and Raman Spectra for Structural Evolution Characterizations of Silk Fibroin

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