Statik ışık saçınım tekniği ile poliakrilamid jellerinde inhomojenitenin incelenmesi
Investigation of the spatial inhomogeneity in poly(acrylamide) (PAAM) gels by static light scattering technique
- Tez No: 216818
- Danışmanlar: PROF.DR. OĞUZ OKAY
- Tez Türü: Doktora
- Konular: Polimer Bilim ve Teknolojisi, Polymer Science and Technology
- Anahtar Kelimeler: Poly(acrylamide) gels, Inhomogeneity, Static Light Scattering
- Yıl: 2006
- Dil: Türkçe
- Üniversite: İstanbul Teknik Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Kimya Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 132
Özet
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Özet (Çeviri)
The spatial inhomogeneity in poly(acrylamide) (PAAm) gels has been investigated with the static light scattering technique. In the first section , the gels were prepared using N,N?-methylenebis(acrylamide) (BAAm) as a crosslinker at a fixed initial monomer concentration but at various crosslink densities. Light scattering measurements show that the excess scattering from gels increases with increasing BAAm content. Since the excess scattering Rex(q) is a measure of the spatial inhomogeneity in a gel, this indicates that the PAAm gel becomes more inhomogeneous with increasing BAAm concentration. The size of the inhomogeneous regins in gels as well as the mean square fluctuations in the reflactive index h2i were calculated using the light scattering data of gels togetter with the Debye-Bueche theory.In the second section ammonium persulfate - N,N,N?,N?-tetramethylethylenediamine redox initiator system was used to initiate the polymerization reactions and to follow up scattering intensities as a function of time of aging gels in the synthesis reactor The scattered light intensities from aged gels were interpreted using the Debye-Bueche analysis and a thermodynamic model was developed. In the third section PAAm gels were prepared at a fixed chemical crosslink density but at various initial monomer concentrations. A critical polymer network concentration was found where the degree of the inhomogeneity in PAAm gels attains a maximum value. The light scattering data were also analyzed within the framework of the Debye-Bueche theory.
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