Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Hatay Mustafa Kemal University, Fen Bilimleri Enstitüsü, Kimya (Yl) (Tezli), Turkey
Approval Date: 2025
Thesis Language: Turkish
Student: KÜBRA ATEŞ
Supervisor: Cemile Özdemir Dinç
Abstract:
The purpose of the presented thesis study was to elucidate the structure of diethylaminoethyl dextran (DEAE-D)/methylene bisacrylamide (MBAM) hydrogel and explain its formation mechanism. The experimental study is consisted of two steps: In the first step, cationic cross-linking reaction was carried out in basic media by changing the amount of MBAM against the fixed amount of DEAE-D and chemically cross-linked cationic DEAE-D/MBAM hydrogels with different compositions were synthesized. Kinetic swelling curves of the samples at 25 C and in water were created and their equilibrium water contents were calculated. Subsequent experimental studies were carried out on the hydrogel with the highest water content. In the second step, the efficiency (gelation percentage) of the hydrogel with the highest water content was calculated as 80%. The structure of this hydrogel was elucidated by FTIR spectroscopy. The dynamic change in structure during gelation was monitored by Fungilab Rotary Dilute Solution Viscometer (Temperature: 27 C, Spin: LCP, Spin speed: 40 rpm). While the viscosity was 2.5 cP at the zero minute, it reached the maximum value of 3.5 cP at the ninth minute (at the gelation point). The thermal stability of the hydrogel was determined using Shimatsu TGA-DTA instrument in the temperature range of 25-550 °C under N2 atmosphere with an increase rate of 10 °C/min. The crystal structure of the hydrogel was illuminated with Rigaku XRD (Tokyo, Japan) device (scanning range: 1°/min, measuring range 5° ≤ 2θ ≤ 60°, radiation: Cu-K -radiation).