Çapraz Bağlı Kitosan/Selüloz/Grafen Kompozitinin Şişme Davranışlarının İncelenmesi

Kitosan/selüloz biyopolimer matrisi grafen ile katkılandıktan sonra basit ve pratik bir yolla çapraz bağlı üçlü absorban kompozit sistemi üretildi. Kitosan iyi film özelliği gösteren, birçok fonksiyonel gruba ve geniş kullanım alanına sahip, yeryüzünde selülozdan sonra en çok bulunan ikinci biyopolimer malzemedir. Kitosanın düşük mekanik özelliklerini arttırmak ve kırılgan yapısını elimine ederek daha esnek bir yapı elde etmek için selüloz ile karıştırıldı. Bu biyopolimer karışım, üretilecek malzemeye iletkenlik kazandırmak ve geniş kullanım alanına sahip bir malzeme üretebilmek için grafen ile katkılandı. Bu kapsamda üç farklı oranda çapraz bağlayıcı kullanılarak hazırlanan kompozitlerin sıvı absorplama özelliklerine pH’ın ve çapraz bağlayıcı miktarının etkisini araştırmak amacıyla şişme testleri yapıldı. Çapraz bağlayıcı olarak glutaraldehit kullanıldı. Artan çapraz bağlayıcı miktarı ve pH ile birlikte şişme ve absorplanan sıvı oranının azaldığı gözlendi. Hazırlanan kompozitlerin mekanik özellikleri çekme testleri ile araştırıldı ve çapraz bağlayıcı miktarı kompozitin çekme dayanımını arttırırken bu artışın çapraz bağlayıcı miktarı ile orantılı olmadığı tespit edildi. Hazırlanan kompozitin yapısal ve moleküler özellikleri FT-IR ve FESEM analizleri ile tespit edildi. Bu analizlerin sonucunda üç bileşenin birbiri içerisinde iyi bir biçimde dağıldığı, bu bileşenler arasında molekül içi ve moleküller arası bağlar ve sinerjik etki sebebiyle güçlü bir etkileşimin olduğu bunun sonucunda da kompozitin yeniden yapılandığı gösterildi.

Investigation of Swelling Behavior of Cross-Linked Chitosan / Cellulose / Graphene Composite

The chitosan / cellulose biopolymer matrix was filled with graphene and a cross-linked ternary absorbent composite system was produced in an easy and practical way. Chitosan is the second most abundant biopolymer material after cellulose, with many functional groups and wide usage areas, showing good film properties. Chitosan with having many functional groups and wide usage areas, showing good film properties is the second most abundant biopolymer material after cellulose. The chitosan/cellulose blend was prepared in order to change the brittle structure of chitosan and to obtain the more flexible material network. Biopolymer blend was filled with graphene to increase the mechanical strength of produced composite material and to produce a conductive and widely used material. In this context, the effect of pH and the amount of crosslinker on the liquid absorption properties of composites prepared with three different amount of crosslinker was investigated by swelling tests. Glutaraldehyde was used as the crosslinker. It was observed that swelling and absorbed liquid ratio decreased with increasing amount of crosslinker and pH. The mechanical properties of the prepared composites were investigated by tensile tests and it was determined the increasing amount of crosslinker increases the tensile strength of the composite and this increase is not proportional to the amount of crosslinker. The structural and molecular properties of the prepared composite were determined by FT-IR and FESEM analysis. As a result of these analyzes, it has been shown the three components were well dispersed in this composite system. Besides them, it was figure out a strong interaction between these components due to the intramolecular and intermolecular bonds and synergistic effect.

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