Kinetics of Anionic Polymerization of ε-Caprolactone (εCL). Propagation of Poly-ε=CL-K+ Ion Pairs |
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Authors: | Stanisl Slashaw Sosnowski Stanisl Slashaw Slomkowski Stanisl Slashaw Penczek |
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Institution: | Polish Academy of Sciences Centre of Molecular and Macromolecular Studies , 90-362 L Slashód?, Boczna , 5 , Poland |
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Abstract: | Kinetics of the anionic polymerization of ε-caprolactone (εCL) initiated with (CH3)3SiO?K+ and carried out in THF solution has been studied in the temperature range from 0 to 20°C by using a calorimetric method. From the kinetic results and from conductometric measurements of the dissociation constant of the living Poly-εCL?K+ ion pairs (KD 20 ? (4 ± 2) × 10?10 mol/L), we concluded that at the conditions indicated above and for concentrations of active centers ranging from 10?3 to 3.7 × 10?2 mol/L, propagation proceeds on the ion pairs and is disturbed neither by dissociation nor by the formation of higher aggregates. For the polymerization of εCL proceeding on the poly-εCL?K+ |
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