شماره ركورد كنفرانس :
5048
عنوان مقاله :
Modeling of RAFT Polymerization of Polystyrene by Moment equations
Author/Authors :
Mehdi ،Salami-Kalajahi Polymer Engineering Department - Amirkabir University of Technology, Tehran, Iran , Mojtaba ،Baqeri-Jagharq Polymer Engineering Department - Amirkabir University of Technology, Tehran, Iran , Vahid ،Haddadi-Asl Polymer Engineering Department - Amirkabir University of Technology, Tehran, Iran
كليدواژه :
Addition-Fragmentation chain transfer polymerization (RAFT) , intermediate radical termination kinetic model (IRT) , modeling , moment equations , kinetics
عنوان كنفرانس :
ششمين كنگره بين المللي مهندسي شيمي
چكيده لاتين :
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 6×106 lit/mol.sec and 5×104 1/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 on
conversion, 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.
