Making the invisible segregation of diverse neighbourhoods visible

Journal of Housing and the Built Environment - There are not clear understandings of the mechanisms of diverse populations in Tehran although it is considered as one of the most diverse...     

Preparation and Characterization of Some Cationic Starches

Three types of cationic starches were prepared via reacting starch with 3-chloro-2-hydroxypropyl amine, 1,1,1,n-Tris(3-chloro-2-hydroxypropyl) amine and glycidyl trimethyl ammonium acetate in presence of sodium hydroxide. The different factors affecting these reactions were investigated. These factors include sodium hydroxide/amine, amine/starch molar ratios, liquor ratio, reaction duration and temperature. The amination extent and amination reaction efficiency percent were traced by estimating the nitrogen content of the aminated starch. Characterization of the prepared cationic starches such as solubility, moisture content, anion-exchange capacity and metal ions sorption were studied.