The Study Of Dissolution Of Protein Fiber In Ionic Liquid

With the developing of economy, Green Chemistry values is enjoy popular support, the leather industry is facing the challenge of sustainable development, and how to recycle leather wastes is become a question of common concern in the word. The major constituent of leather wastes is protein, which is a kind of valuable resource. In the past, the leather wastes only a litter was reused but most was discarded, and become a serious environmental pollution. Therefore, reclamation of leather wastes is become of important mean to the environment and society. The study focus on recovered and reused of leather wastes.Ionic Liquids,1-allyl-3-methylimidazolium chloride [AMIM]Cl,1-butyl-3-methylimidazolium chloride [BMIM]Cl and1-ethl-3-methylimidazolium bromide [EMIM]Br were used to dissolve pigskin collagen powder in this article. The optimum temperature of collagen dissolved in [AMIM]Cl and [BMIM]Cl is140℃, but [EMIM]Br is130℃and the biggest dissolution rate (solubility) of collagen powder is66wt%(8.78wt%) in [AMIM]Cl,58.3wt%(7.76wt%) in [BMIM]Cl, and58.7wt%(7.81wt%) in [EMIM]Br at their own optimum temperature. As the temperature of ionic liquids increased, the dissolution rate (solubility) of collagen in ionic Liquids increased, temperature has a strong effect on the solubility. The cation of ionic liquids also has effect on the solubility of collagen, this is to say that the solubility of collagen in ionic liquids depends on the identity of both the cation and anion, with the anion having a much larger effect. The more the cation and anion are able to participate in hydrogen bonding, the greater the solubility of the collagen. Collagen can be easily regenerated from its ionic liquid solutions by addition alcohol. After collagen regeneration, the ionic liquids can be recovered and reused. IR, UV, XRD, TGA methods were used to analysis the regenerated collagen. The results suggest that regenerated collagen completely accord with the characteristics of collagen and the regenerated collagen is amorphous. The thermal stability of regenerated collagen is slightly superior to that of collagen and the residuum of regenerated collagen is less than collagen.The regenerated collagen was used to modify polyacrylonitrile. The fibers made of the modified polyacrylonitrile were characterized by FT-IR, SEM, mechanical test and moisture regain spectroscopy. It was shown that the breaking strength of collagen/PAN blending fibers decreased gradually with the increasing collagen. The breaking strength of collagen/PAN blending fibers was1.72～2.21cN/dtex when the content of collagen below20%. Longitudinal groove that embedded in the fibers surface was covered by collagen, and a film of collagen was generated on the fibers surface.