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Poly[(4‐hydroxybutyric acid)‐ alt ‐(glycolic acid)]: Synthesis by Thermal Polycondensation of Metal Salts of 4‐Chlorobutyric Acid Carboxymethyl Ester
Author(s) -
MartínezPalau Meritxell,
Franco Lourdes,
Ramis Xavier,
Puiggalí Jordi
Publication year - 2006
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200500260
Subject(s) - glycolic acid , chemistry , condensation polymer , polymer chemistry , polymerization , differential scanning calorimetry , thermal stability , sodium , potassium , organic chemistry , polymer , lactic acid , genetics , thermodynamics , physics , bacteria , biology
Summary: A new sequential copolyester consisting of glycolic acid and 4‐hydroxybutyric acid units was prepared by a thermal polycondensation method that uses the formation of metal chloride salts as a driving force. The polymerization conditions (time, temperature) were studied in order to obtain appropriate molecular weights and high yields. Thermal properties and thermal stability were also determined. The polymerization kinetics of sodium, potassium and cesium monomer derivatives were studied by differential scanning calorimetry and the results compared. Non‐isothermal data and an isoconversional procedure (free model) were applied to determine the Arrhenius parameters (activation energy and pre‐exponential factor). The kinetic model was selected according to both the Coats‐Redfern method and the evaluation of isokinetic parameters.DSC heating runs of sodium, potassium and cesium salts of 4‐chlorobutyric acid carboxymethyl ester after preheating at 100 °C.