A kinetic investigation of the  in situ  polymerization of methyl methacrylate under supercritical fluid CO 2  conditions using high‐pressure DSC | Zendy

Lu Shiying | Zendy; Zhang Zhiyi | Zendy; Nawaby A. Victoria | Zendy; Day Michael | Zendy

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A kinetic investigation of the in situ polymerization of methyl methacrylate under supercritical fluid CO 2 conditions using high‐pressure DSC

Author(s) -

Lu Shiying,

Zhang Zhiyi,

Nawaby A. Victoria,

Day Michael

Publication year - 2004

Publication title -

journal of applied polymer science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.575

H-Index - 166

eISSN - 1097-4628

pISSN - 0021-8995

DOI - 10.1002/app.20574

Subject(s) - supercritical fluid , polymerization , kinetics , methyl methacrylate , isothermal process , activation energy , kinetic energy , polymer chemistry , materials science , degree of polymerization , order of reaction , solvent , chemistry , thermodynamics , reaction rate constant , polymer , organic chemistry , physics , quantum mechanics

The polymerization kinetics of methyl methacrylate (MMA) under supercritical fluid CO 2 was studied by using high‐pressure DSC. The results indicate that CO 2 can significantly reduce the cage effect and improve the chain propagation reactions, with the observed solvent‐like effects being enhanced by increased CO 2 pressures. The polymerization of MMA under isothermal conditions and 56 atm of CO 2 was characterized by a first‐order kinetic rate expression over the conversion range 20–80%. The apparent activation energy for the reaction was found to be 51.6 kJ/mol, which is less than the value reported under ambient conditions (68.2 kJ/mol). The polymerization kinetics were also evaluated under nonisothermal conditions. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 1236–1239, 2004

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