Investigation of the structure changes and properties of stretched mohair fibre

Structural changes in slenderized yak hair induced by heat–humidity conditions using Raman spectroscopy

“…The X-ray analysis indicated the increased b-sheet [12][13][14][15] and the less a-helix [16,17] of keratin protein fibers during the stretching process, which were consistent with the results of infrared spectra [18][19][20]. The a-helix configuration transformed to b-sheet configuration of keratin protein fibers during stretching process by FT-Raman spectra [10,[21][22][23][24]. These evidences strongly supported that stretching results in the structure transformation from a-keratin crystalline structure to a b-keratin crystalline structure.…”

Secondary structure estimation and properties analysis of stretched Asian and Caucasian hair

“…For the stretched hairs, the yield region disappeared gradually with the stretching ratios increase, especially beyond 60% stretching ratio. It implies that the α‐helices in human hair have been transformed to the β‐pleated sheets, which is the same as the previous investigations . Moreover, the breaking strength of human hair increases with the stretching ratio, while the elongations at break decrease with the stretching ratio due to the α‐β transformation.…”

Improvement of mechanical properties of cashmere fibers during microwave vacuum drying

“…The ratio of the peak area of each structure to the sum peak areas of various conformations can be used to estimate the percentage of each conformation quantitatively. The calculation of the proportion of random coils is shown as an example in the following expression 42,45 where PR is the percentage of random coil conformations and SB, SR, SA and ST represent the peak areas corresponding to the β-sheet, random coils, α-helix and turns, respectively. According to this calculation method, the percentage of the secondary structure of each cashmere sample is as shown in Figure 8.…”

“…The ratio of the peak area of each structure to the sum peak areas of various conformations can be used to estimate the percentage of each conformation quantitatively. The calculation of the proportion of random coils is shown as an example in the following expression 42,45…”