Enhanced thermal stability of poly(p-dioxanone) in melt by adding an end-capping reagent |
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| Authors: | S -D Ding C -Y Bai Z -P Liu Y -Z Wang |
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| Institution: | (1) Center for Degradable and Flame-Retardant Polymeric Materials, College of Chemistry, Chengdu, 610064, P.R.China;(2) Key Laboratory of Green Chemistry and Technology of Ministry of Education, Sichuan University, Chengdu, 610064, P.R.China;(3) State Key Laboratory of Polymer Materials Engineering, Chengdu, 610065, P.R.China |
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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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| Keywords: | activation energy end-capping reagent isocyanate poly(p-dioxanone) thermal stability |
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