Influence of Degumming Methods on Mechanical Properties of Silk and CODcr of Wastewater
Silk fibers was degummed by different methods: sodium carbonate, neutral soap, tartaric acid, 2709 alkaline proteinase and hot pressurized water.The physical properties and secondary structure of silk and the CODcr of degumming wastewater were investigated to elucidate the effects after different degumming treatment.The results showed that the silk sericin was almost removed completely through various degumming methods, the degumming effects on silk including the appearance, the mechanical properties and the CODcr of degumming wastewater were different. Compared with five degumming methods, the surface morphology of degummed silk fiber was very smooth and fine, except hot pressurized water.The tensile strength of silk fibers degummed by all of the methods was decreased to some excent. The molecular conformation estimated by Fourier transform infrared spectroscopy stayed unchanged regardless of different degumming methods. The CODcr of wastewater degummed with different methods showed obvious difference, soap degumming wastewater was much higher than that of sodium carbonate degumming wastewater.
Xiaoming Qian and Huawu Liu
X. Dong et al., "Influence of Degumming Methods on Mechanical Properties of Silk and CODcr of Wastewater", Advanced Materials Research, Vols. 332-334, pp. 183-187, 2011