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Abstract  

For the enhancement of thermal stability of poly(p-dioxanone) (PPDO), the isocyanate end-capping reagent was prepared by treatment of toluene-2,4-diisocyanate with an equivalent of 1-hexyl alcohol. The end-capping reagent and the end-capping PPDO with an inherent viscosity of 0.26 dL g−1 were characterized by FTIR and 1H-NMR. Thermal stability of the end-capping PPDO with an inherent viscosity of 0.92 dL g−1 was investigated isothermally and non-isothermally under air atmosphere using thermogravimetry. It has been shown that the addition of the prepared isocyanate can enhance significantly the thermal stability of PPDO. The activation energies for non-isothermal degradation estimated by Kissinger method and Friedman method are 91, 81 kJ mol−1 for as-prepared PPDO, and 160, 149 kJ mol−1 for the end-capping PPDO, respectively. The activation energy increases by about 70 kJ mol−1 through the end-capping.

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-3910(99)00155-X . 6. Yang , KK , Wang , XL , Wang , YZ , Wu , B , Yin , YD , Yang , B . Kinetics of thermal degradation and thermal oxidative degradation of poly( p -dioxanone) . Eur

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, Wu , B , Yin , YD , Yang , B . Kinetics of thermal degradation and thermal oxidative degradation of poly( p -dioxanone) . Eur Polym J . 2003 ; 39 : 1567 – 1574 . 10.1016/S0014-3057(03)00052-1 . 18

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-009-0041-4 . 12. Ding , SD , Bai , CY , Liu , ZP , Wang , YZ 2008 Enhanced thermal stability of poly( p -dioxanone) in melt by adding an end-capping reagent . J Therm Anal Calorim 94 : 89 – 95 10.1007/s10973-007-8469-x

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, Antunes , MCM , Santos , AR , Felisbert , MI 2008 Blends of poly(3-hydroxybutyrate) and poly(p-dioxanone): miscibility, thermal stability and biocompatibility . J Mater Sci Mater Med 19 : 3535 – 3544 10.1007/s10856

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, J , Marquez , L , Raquez , JM , Degée , P , Dubois , P , Hobbs , J , Hamley , IW . Self-nucleation and crystallization kinetics of double crystalline poly( p -dioxanone)- b -poly(∊-caprolactone) diblock copolymers . Faraday Discuss

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