Effect of reaction temperature on the physicochemical properties of poly(pentadecanolide) obtained by enzyme-catalyzed ring-opening polymerization

Differences on physicochemical properties of poly(pentadecanolide) (PPDL) synthesized by enzymatic ring-opening polymerization at two different temperatures, 70 and 90 °C, using Novozyme 435 were assessed. PPDL synthesized at 90 °C presents lower molecular weight and crystallinity than the one prepa...

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Bibliographic Details
Published in:Polymer bulletin (Berlin, Germany) Germany), 2015-03, Vol.72 (3), p.441-452
Main Authors: Wilberth, Herrera-Kao, Manuel, Cervantes-Uc J., Tania, Lara-Ceniceros, Manuel, Aguilar-Vega
Format: Article
Language:English
Subjects:
Biodegradable materials
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Crystallization
Enzymes
Hydrocarbons
Melting
Molecular weight
Nitrogen
NMR
Nuclear magnetic resonance
Organic Chemistry
Original Paper
Physical Chemistry
Polymer Sciences
Polymerization
Polymers
Ring opening polymerization
Soft and Granular Matter
Solvents
Structural stability
Temperature
Thermal stability
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Summary:Differences on physicochemical properties of poly(pentadecanolide) (PPDL) synthesized by enzymatic ring-opening polymerization at two different temperatures, 70 and 90 °C, using Novozyme 435 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, 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 and crystallization 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.
ISSN:0170-0839
1436-2449
DOI:10.1007/s00289-014-1288-x