Publication: Hidrofobik Yan Grupların Poliakrilamid Hidrojellerinin İnhomojenite Derecesine Etkisi
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Kimyagerlik
Chemistry
Chemistry
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Fen Bilimleri Enstitüsü
Institute of Science and Technology
Institute of Science and Technology
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Bu çalışmada, akrilamid (AAm) esaslı monomerler ile bir kimyasal çapraz bağlayıcının, örneğin N,N’-metilenbis(akrilamid)’in (BAAm) sulu ortamda serbest-radikal mekanizma ile kopolimerizasyonu sonucu hidrojeller elde edilmiştir. Jelleşme sisteminin ideal dışı özellikleri nedeniyle reaksiyon sonucu oluşan hidrojellerde çapraz bağlar homojen bir dağılım göstermezler; yani bazı bölgeler daha yüksek, bazı bölgeler ise daha düşük derecede çapraz bağlıdır. Jel inhomojenitesi olarak adlandırılan ve hidrojellerde nanometre boyutlarında yüksek çapraz bağlı bölgelerin ortaya çıkmasına neden olan bu durum jellerin mekanik özelliklerini kötüleştirmektedir. Dolayısıyla hidrojellerin inhomojenite derecelerinin azaltılarak minimuma indirilmesi, yani homojen hidrojellerin eldesi onların mekanik özelliklerini iyileştirecektir.
In this study hydrogels are prepared by free-radical crosslinking copolymerization of acrylamide (AAm)-based monomers with a chemical crosslinker such as N,N’-methylenebis(acrylamide) (BAAm) in aqueous solution. Due to the several non-ideal features of the gelation system, hydrogels formed exhibit an inhomogeneous distribution of crosslinks, known as the spatial gel inhomogeneity. As a consequence, hydrogels contain nanometer-sized highly crosslinked domains, which dramatically reduce their mechanical properties. Thus, suppression of the gel inhomogeneities would provide formation of hydrogels with improved mechanical properties.
In this study hydrogels are prepared by free-radical crosslinking copolymerization of acrylamide (AAm)-based monomers with a chemical crosslinker such as N,N’-methylenebis(acrylamide) (BAAm) in aqueous solution. Due to the several non-ideal features of the gelation system, hydrogels formed exhibit an inhomogeneous distribution of crosslinks, known as the spatial gel inhomogeneity. As a consequence, hydrogels contain nanometer-sized highly crosslinked domains, which dramatically reduce their mechanical properties. Thus, suppression of the gel inhomogeneities would provide formation of hydrogels with improved mechanical properties.
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Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2009
Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2009
Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2009
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İTÜ theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission
İTÜ theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission
Keywords
Jel inhomojenitesi, hidrojel, Gel inhomogenity, hydrogels
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