Preparation Of Collagen Fiber Based Hybrid Materials And Their Properties

Collagen fiber,an abundant natural linear polymer material,has multiple favorable performances,such as biodegradability,biocompatibility,low antigenicity and low cytotoxicity.It has been utilized in food,medicine,cosmetics,separation and other fields,showing a broad application.Currently,the main modification methods of collagen fiber are grafting modification and the introduction of inorganic particle technology.However,due to the limit of grafting monomers and grafting technology,the introduced inorganic particles are easy to reunite,the application of collagen fiber has been seriously affected.In this paper,we took advantage of ion enrichment activity of reactive group like-COOH,-CONH-,-CONH₂and-NH₂,collagen fiber based hybrid materials were successfully prepared by using in-situ organic-inorganic hybridization technique.The new method of modifying collagen fiber and the law of the morphology,micro structure and performance changing with the metal ion concentration of the precursor solution have been researched.The free fatty acid adsorption performance of collagen fiber/barium sulfate hybrid materials and the photocatalytic activity of collagen fiber/silver salts hybrid materials have been studied in order to build the basic theory of modifying collagen fiber.This work enlarged the application scope of collagen fiber and provided new way of thinking in treatment of wastes with processes of wastes against one another.Basically,the following results have been achieved:Collagen fiber/BaSO₄ hybrid materials were successfully prepared via in-situ organic-inorganic process.The surface morphology,hybrid mechanism and thermal stability of these materials were characterized.And two other experiments were designed to test their water adsorption and free fatty acids?FFA?adsorption ability.Precipitated by BaCl2,BaSO4particles were evenly distributed in collagen fiber,the particle size increased up to 5?m with BaCl2 concentration decreasing to 0.5wt%.The form of BaSO4particles changed from crystalline phase to amorphous phase when BaCl₂ concentration increased above 1.5 wt%.Hydrogen-bonding effect between collagen fiber and BaSO₄ precipitate were detected.The decomposition temperature of collagen fiber was improved with the introduction of BaSO₄particles,while the water adsorption rate reduced from 249%to 174%.The FFA adsorption ability of the materials are dependent on the content and forms of BaSO₄ particles in collagen fiber.Silver salts/collagen fiber hybrid composites with photocatalytic and antibacterial activities were successfully prepared in this study via the in-situ organic-inorganic process.The surface morphology,chemical composition and structure were discussed.Scanning electron microscopy?SEM?observation showed that the silver salts/collagen fiber hybrid composites were successfully prepared with silver salt particles?300-500 nm?distributing evenly on the surface of collagen fiber.X-ray diffraction?XRD?patterns and Fourier transform infrared spectroscopy?FTIR?analysis provided strong evidence for the successful coating of silver salts on the surface of collagen fiber and the hybrid mechanism was subsequently discussed.The photocatalytic activity was evaluated by degrading methyl orange?MO?under ultraviolet?UV?light and visible light,respectively.The results indicated that AgCl/Collagen Fiber showed the most efficient photocatalytic activity under UV and visible light irradiation.Furthermore,the introduction of Ag⁺endowed the photocatalysts with antibacterial performance,which was investigated by measuring the width of the bacteriostatic belts.The results indicated the antibacterial activity of the composites,proving that the photocatalysts were durable and reusable.To expand the utilization of collagen fiber,Ag@AgCl-collagen fiber nano-hybrid materials with photocatalytic activities were successfully prepared in this study via an in situ organic-inorganic process.The surface morphology,hybrid mechanism and the chemical composition and structure of these materials are discussed,and the evaluation of photocatalytic activity is included.The SEM observation showed that the AgCl particles were evenly distributed in the collagen fiber,and the size of the AgCl particles was approximately300-500 nm.The comparison of these SEM photographs implied the hybrid mechanism of the in situ organic-inorganic process.XRD patterns and FTIR analysis certified the existence of AgCl and collagen fiber,respectively.The photocatalytic activity evaluation was carried out by degrading methyl orange?MO?under ultraviolet?UV?light and daylight,respectively.The experimental results indicated that Ag@AgCl-collagen fiber nano-hybrid materials can respond to both UV and daylight,and their photocatalytic activity was notable.The effect of pH on the degradation of MO under daylight was also investigated;the results showed that the photocatalytic activity was restricted as pH value increased.Lastly,the antibacterial performance was investigated by measuring the widths of the bacteriostatic belts,which indicated the antibacterial activity of the material.