Study On The Chemical Self- Assembled Modification Of Collagen Onto Surface Of PAN Fiber And The Impact On Its Performance

Large amounts of Polyacrylonitrile(referred to PAN) fiber waste would be produced in the process of the production and use, which not only caused a serious waste of resources but also polluted the environment. And although PAN fiber has good flexibility and excellent mechanical properties, but PAN fiber has some obvious disadvantages, such as poor water absorption and electrostatic tendency, which restricted its application in certain extent. This paper aims to achieve resource recycling to PAN fiber waste, and improve their own shortcomings by function modification.The project used the extracted collagen from leather waste to chemical modify the waste PAN staple fiber on its surface. Firstly, the cyano group was converted to the carboxyl group by alkaline hydrolysis on the fiber surface, and then by reaction of the acylchloride, the carboxyl group was converted to acid chloride group, and then according to the principle that the amino and carboxy in collagen can occur condensation reaction, successfully prepared modified PAN fiber, and the structure and properties of the fibers were characterized and analyzed.Firstly, through orthogonal experimental studied the PAN fiber’s alkaline hydrolysis process and determined the optimal conditions that sodium hydroxide concentration of 12%, hydrolysis temperature 80 ℃ and reaction time 10 min, that the cyano hydrolysis rate was 61.7%. The structures and morphologies of the PAN fiber and the hydrolysis PAN fiber were systematically investigated by Fourier transform infrared spectroscopy(FTIR-ATR) and scanning electron microscopy(SEM), indicating that the alkaline hydrolysis process occurred on PAN fiber surface and the inner structure of the fiber was almost unchanged.Thionyl chloride was chosen as an chloroformylated agent, discussed the influence of the reaction time, the amount of thionyl chloride and the reaction temperature on the hydrolysis PAN fiber chloride through a single factor experiment. The results indicate that 0.5g hydrolyzed PAN fibers had the highest rate of chloride when were added 2.0m L thionyl chloride and reacted 60 minute under 80℃, under these conditions had the highest rate of carboxyl chloride that was up to 85.1%.Collagen and hydrolysis of PAN fibers after chloride were subjected to a condensation reaction. By optimizing treatment experiment, a fiber with collagen protein on its surface was obtained and presented with 8.45% collage content. The modified PAN fibers was performed amino acid analysis, indicating that 8.07% of the total fiber was the amino acid content, less than collagen content. The structures and morphologies of the modified PAN fibers were systematically investigated by FTIR-ATR, SEM and coomassie blue staining. FTIR-ATR spectra appeared characterized absorption peaks of amide bond and hydroxyl group, indicating PAN fiber surface occurred a series of chemical reactions of hydrolysis and condensation, achieved the collagen chemical modification on PAN fiber surface; a layer of collagen film can be seen on the modified fiber surface by scanning electron microscopy; coomassie staining experimental validated that the collagen modified PAN fibers by chemical action.The mechanical properties, antistatic properties, thermal stability, moisture regain and others properties of modified PAN fiber were investigated. The results showed that compared with the PAN fiber, the collagen modified PAN fiber’s tensile breaking strength increased by 43%, but the elongation at break decreased 17.4%, meetting the requirements of textile processing; specific resistance and volume resistivity has fallen 99.2%, significantly improved the antistatic of fiber; heat resistance did not change significantly; absorption improved 93.6% and moisture regain increased 280.1%, made the fiber absorbency and moisture regain greatly enhanced. Through using acid dyes and reactive dyes dyed PAN fibers and modified PAN fibers and washable color fastness test indicated that the chromatin effect of modified fibers was higher than PAN fiber, dyeing conditions became mild; The chromatin effect of acid dyes was higher than reactive dyes’ dyeing effect, but washable color fastness of acid dyes worse than reactive dyes washable color fastness.