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6852739 
Journal Article 
Equilibrium polymerization behavior of 1,4-dioxan-2-one in bulk 
Nishida, H; Nishida, H; Yamashita, M; Yamashita, M; Endo, T; Endo, T; Tokiwa, Y; Tokiwa, Y 
2000 
1 
Macromolecules
ISSN: 0024-9297
EISSN: 1520-5835 
33 
19 
6982-6986 
WOS:000089461800014 
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 degrees C. The thermodynamic parameters Delta H-1s, Delta S-1s, and ceiling temperature for the polymerization were -14.1 kJ mol(-1), -26.15 mol(-1) K-1, and 265 degrees C, respectively. The parameters support the thermal instability of PPDO. The calculated thermal parameters of activation were E-a = 71.8 kJ mol(-1), Delta G(p)(double dagger) = 106.2 kJ mol(-1), Delta H-p(double dagger) = 68.5 kJ mol(-1), and Delta S-p(double dagger) = -95.7 J mol(-1) K-1 at 120 degrees C. These parameters of activation are nearly equal to those of L-lactide. PDO and PPDO are easily polymerizable and depolymerizable materials, respectively.< 
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