Kinetics and Mechanism of the Polymerization of Methyl Methacrylate in a Y(acac)3/n-BuMgCl System

Chemical Research in Chinese Universities ›› 2000, Vol. 16 ›› Issue (1): 61-66.

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Kinetics and Mechanism of the Polymerization of Methyl Methacrylate in a Y(acac)₃/n-BuMgCl System

PAN Zhi-da, SUN Jun-quan, YANG Shi-lin

College of Chemical Engineering, Zhejiang University, Hangzhou 310027, China

Received:1999-03-02 Online:2000-01-24 Published:2011-08-17
Supported by:
the National Natural Science Foundation of China(29774021)

Abstract

Abstract: Based on the kinetics equation proposed by T.Kagiya, the kinetic study on the polymerization of methyl methacrylate(MMA) by Y(acac)₃/n-BuMgCl was carried out with a dilatometer.It was found that the rate of propagation is the first order with respect to the concentration of both active center and monomer.Thus, the equation of propagation rate can be described as R_p=K_p[c^*][M].In addition, the instantaneous chain initiation and single molecular termination were concluded for the present system.The activation energy is close to 32 kJ/mol.In the polymerization, n-BuMgCl acts not only as the cocatalyst, but also as chain transfer agent with c_I=3.6 × 10^-4.

Key words: Polymerization, Kinetics, Mechanism, Methyl methacrylate, Rare earth catalyst

PAN Zhi-da, SUN Jun-quan, YANG Shi-lin . Kinetics and Mechanism of the Polymerization of Methyl Methacrylate in a Y(acac)₃/n-BuMgCl System[J]. Chemical Research in Chinese Universities, 2000, 16(1): 61-66.

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Kinetics and Mechanism of the Polymerization of Methyl Methacrylate in a Y(acac)₃/n-BuMgCl System

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