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Characterization of Polyesters Obtained by Enzyme-Catalyzed Ring-Opening Polymerization of Pentadecanolide at high Temperature

  • W. Herrera-Kao (a1) (a2), M. Cervantes-Uc (a1), T. Lara-Ceniceros (a2) and M. Aguilar-Vega (a1)

Abstract

Differences on physicochemical properties of poly(pentadecanolide), PPDL, synthesized by enzymatic ring opening polymerization at two different temperatures, 70 C and 90 C, using Novozyme-430 were assessed. PPDL synthesized at 90°C presents lower molecular weight and crystallinity than the one prepared at 70°C. It was detected by FTIR that PPDL synthesized at 90°C presents a large amorphous phase with more terminal OH groups. A difference in the melting and crystallization behavior was detected by differential scanning calorimetry, DSC, where the melting of the PPDL synthesized at 90°C presents multiple melting and crystallization events at lower temperature than those exhibit by PPDL synthesized at 70°C which presents a well defined single melting and crystallization event. The differences in melting behavior are attributed to the presence of a larger amorphous phase in PPDL synthesized at 90°C due to increased number of terminal OH groups that disrupt the crystalline structure. Thermal stability is also higher in PPDL synthesized at 70°C since the onset of decomposition starts 50°C above that observed in PPDL obtained at 70°C.

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Keywords

Characterization of Polyesters Obtained by Enzyme-Catalyzed Ring-Opening Polymerization of Pentadecanolide at high Temperature

  • W. Herrera-Kao (a1) (a2), M. Cervantes-Uc (a1), T. Lara-Ceniceros (a2) and M. Aguilar-Vega (a1)

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