Studies on polyurea membrane

Abstract Synthesis of polyurea by interface polymerization of diisocyanate and diamine for preparation of polymer membrane for use in separation problems was investigated. A sulfuric‐acid‐based casting formulation was developed for the polymer prepared from 1,6‐hexamethylene diamine and 1,6‐hexamethylene diisocyanate. The resulting membrane is porous and highly permeable to water. However, salt rejection was found to be <20%, while high molecular weight solutes like milk, papain, and Na‐alginate were found to be rejected 100%. The membrane is more like a sieve structure with the absence of an asymmetric layer. It is found to be resistant to many organic solvents, thus making it suitable for use in ultrafiltration applications.