Küresel jellerin sentezi ve içindeki sıvının buharlaşma hızına jel geometrisinin etkisinin modellenmesi
Spherical gel synthesis and the modelling of the effect of gel geometry to the evaporation velocity of the liquid in the gel
- Tez No: 135927
- Danışmanlar: PROF. DR. YILDIRIM ERBİL
- Tez Türü: Yüksek Lisans
- Konular: Kimya, Chemistry
- Anahtar Kelimeler: Polimerik jeller, hidrojeller, poliakrilamid jelleri, jellere çözücü cüfüzyonu, şişme kinetiği, jel geometrisi
- Yıl: 2003
- Dil: Türkçe
- Üniversite: Kocaeli Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Kimya Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 111
Özet
KÜRESEL JELLERİN SENTEZİ veJEL İÇİNDEKİ SIVININ BUHARLAŞMA HIZINA JEL GEOMETRİSİNİN ETKİSİNİN MODELLENMESİ Erhan MENDİ
Özet (Çeviri)
SPHERICAL GEL SYNTHESIS AND THE MODELLING OF THE EFFECT OF GEL GEOMETRY TO THE EVAPORATION VELOCITY OF THE LIQUID IN THE GEL Erhan MENDİ KEY WORDS: Polymers gels, hydrogels, polyacrylamide gels, solvent diffusion in gels swelling kinetics, gel geometry. ABSTRACT: The swelling of the polymer gels in a solvent has been a subject of many industrial applications. Especially polymer gels that swell in the water (hydrogels) are used in medical and biomedical applications. However the effect of the gel geometry, to the swelling kinetics of the gels, had not been studied until today. The polymerization of acrylamide/maleic anhydride (AAm/MA) copolymer, that has a high water absorption capacity, is carried out in spherical, cubic and cylinderical shapes by using, the sets having the same amount of ethylene glycol dimethacrylate (EGDM) and N,N'-methylenebisacrylamide (BAAM) crosslinker with ammonium persulfate (APS) iniator and the optimum conditions are determined that obtain the homogeneous gel synthesis. The swelling kinetics of the formed gels in the water at 25 °C, was followed by measuring the weight increase of the gel by time. The synthesized gels, that have different geometrical shapes, have the same equilibrium swelling values. However, the rate of reaching to this equilibrium is different for each gel geometry. Cylindrical gel has the shortest time, spherical gel has the longest time where as the cubic gel has the moderate time of equilibrium positioning. The dynamic swelling kinetic of the gels is modeled and a kinetic equation is developed to explain the swelling rate of each geometrical gel shape. Ill
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