H. Nishida, M. Yamashita, T. Endo
Sep 1, 2000
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Macromolecules
Abstract
To clarify the equilibrium polymerization behavior of 1,4-dioxan-2-one, PDO, bulk polymerization was investigated with Sn(II) ethylhexanoate or triethylaluminum over a range of 60−180 °C. The thermodynamic parameters ΔHls, ΔSls, and ceiling temperature for the polymerization were −14.1 kJ mol-1, −26.1 J mol-1 K-1, and 265 °C, respectively. The parameters support the thermal instability of PPDO. The calculated thermal parameters of activation were Ea = 71.8 kJ mol-1, ΔGp⧧ = 106.2 kJ mol-1, ΔHp⧧ = 68.5 kJ mol-1, and ΔSp⧧ = −95.7 J mol-1 K-1 at 120 °C. These parameters of activation are nearly equal to those of l-lactide. PDO and PPDO are easily polymerizable and depolymerizable materials, respectively.