İYONLAŞTIRICI RADYASYONLA KSANTAN SAKIZI ESASLI SÜPER EMİCİ POLİMERLERİN HAZIRLANMASI

Abstract

The main purpose of this study is to determine the optimum irradiation dose rate, dose, polymer concentration, the type and concentration of the chemicals that will affect the crosslinking process and to investigate the usability of the obtained natural polymer (xanthan gum) based hydrogels as a potential substitute of commercially available synthetic polymer based SAPs. It has been determined that many polysaccharides can be cross - linked with a synthetic monomer in the presence of a sensitizing chemical or when irradiated under conditions called paste like state . However, there is no comprehensive study of the interaction, cross - linking and preparation of superabsorbent polymers with ioni zing radiation of xanthan gum , which studied in this work , a polysaccharide commonly used in the food industry, which obt ained through fer mentation of glucose or sucrose . In addition to these , the Kuhn - Mark - Houwink - Sakura (KMHS) constants in various solvent systems, one of the most important parameters for determining the molecular weight of a polymer, are limited to a singl e solvent and low temperature for xanthan gum in literature. For these reason s, in this study, first , the effect of ionizing radiation on pure xanthan gum was investigated. The fundamental changes in chemical structure and chain structure of xanthan gum irradiated at different conditions (in the powder form and in solution form with various concentrations) were investigated by spectroscopic, chromatographic and rheological analyzes. Spectroscopic analyze s have shown that the main effects of ionizing radia tion o n xanthan gum occur red on main chain.