MEASUREMENTS OF MONOMER REACTIVITY RATIOS FOR COPOLYMERIZATION OF STYRENE AND METHYL METHACRYLATE IN CARBON DIOXIDE AT VAPOR-LIQUID EQUILIBRIUM STATE

Zi Wang a; b; Qing-zhi Dong a

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MEASUREMENTS OF MONOMER REACTIVITY RATIOS FOR COPOLYMERIZATION OF STYRENE AND METHYL METHACRYLATE IN CARBON DIOXIDE AT VAPOR-LIQUID EQUILIBRIUM STATE

Papers | Updated：2021-06-21

- MEASUREMENTS OF MONOMER REACTIVITY RATIOS FOR COPOLYMERIZATION OF STYRENE AND METHYL METHACRYLATE IN CARBON DIOXIDE AT VAPOR-LIQUID EQUILIBRIUM STATE
- Vol. 27, Issue 3, Pages: 367-374(2009)
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- Published：20 May 2009
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Zi Wang a, b, Qing-zhi Dong a. MEASUREMENTS OF MONOMER REACTIVITY RATIOS FOR COPOLYMERIZATION OF STYRENE AND METHYL METHACRYLATE IN CARBON DIOXIDE AT VAPOR-LIQUID EQUILIBRIUM STATE[J]. 2009, 27(3): 367-374.
DOI：

Zi Wang a, b, Qing-zhi Dong a. MEASUREMENTS OF MONOMER REACTIVITY RATIOS FOR COPOLYMERIZATION OF STYRENE AND METHYL METHACRYLATE IN CARBON DIOXIDE AT VAPOR-LIQUID EQUILIBRIUM STATE[J]. 2009, 27(3): 367-374. DOI：

摘要

The monomer reactivity ratios of free radical copolymerization of styrene and methyl methacrylate in carbon dioxide at vapor-liquid equilibrium state (vlCO2) at 65°C and under 7.5-8.5 MPa were measured. The experimental results showed that

in comparison with the data in bulk copolymerization

the monomer reactivity ratio of St in vlCO2 increased acompanied by a somewhat decrease in that of MMA. Further analysis of the sequence distributions of these copolymers by 1H-NMR spectra indicated that there was a significant bootstrap effect in this system. The local monomer concentrations in the proximity of growing free radicals

rather than the true reactivity of monomers or free radicals

were altered by the presence of vlCO2

leading to the change in monomer reactivity ratios.

Abstract

in comparison with the data in bulk copolymerization

rather than the true reactivity of monomers or free radicals

were altered by the presence of vlCO2

leading to the change in monomer reactivity ratios.

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