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Polymerization of L-lactide and ϵ-caprolactone in the presence of methyl trifluoromethanesulfonate

✍ Scribed by Irma Rangel; Michèle Ricard; Alain Ricard

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
297 KB
Volume
195
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

The cationic polymerization of L‐lactide and ϵ‐caprolactone initiated by methyl trifluoromethanesulfonate in nitrobenzene was studied. The monomer conversion and the average molecular weight decrease when the temperature increases. The kinetics constants for L‐lactide and ϵ‐caprolactone polymerizations are, respectively, equal to 1,7·10^−3^ min^−1^ and 1,60·10^−3^ min^−1^ at 50°C. The thermodynamic parameters were determined from the temperature dependence of the equilibrium monomer concentration. Thus for L‐lactide and ϵ‐caprolactone polymerization the enthalpy and entropy values are, respectively, equal to Δ__H__(L‐lactide) = −24,9 kJ/mol; Δ__S__(L‐lactide) = −25 J/(mol·K) and Δ__H__(ϵ‐caprolactone) = −15,35 kJ/mol; Δ__S__(ϵ‐caprolactone) = −35 J/(mol·K).

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