سال انتشار: ۱۳۸۸

محل انتشار: ششمین کنگره بین المللی مهندسی شیمی

تعداد صفحات: ۶

نویسنده(ها):

Mehdi Salami-Kalajahi – Polymer Engineering Department, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran
Mojtaba Baqeri-Jagharq – Polymer Engineering Department, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran
Vahid Haddadi-Asl – Polymer Engineering Department, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran

چکیده:

In current work, a mechanism based on intermediate radical termination theory is assumed for RAFT polymerization. Moment equations method was used to model this mechanism and the results were compared to experimental data to verify modeling. According to the fitting of modeled dependencies to the experimental data, rate constants of addition ( a k ) and fragmentation ( f k ) are determined 6×۱۰۶ lit/mol.sec and 5×۱۰۴ ۱/sec respectively, which leads to an equilibrium constant value of 1.2 102 a f K=k k = ´ . The effects of changing of RAFT agent concentration onconversion, molecular weight and polydispersity index of the final product were investigated through the modeling.According to the results, the livingness of polymerization increases with raising RAFT agent concentration which leads to linearity of conversion and molecular weight curves and make polydispersity index and molecular weight distribution become lower and narrower namely.