Journal
JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS
Volume 51, Issue 1-3, Pages 411-424Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00222348.2011.597325
Keywords
activation energy; electrospinning; electrospun fibers; poly(lactic acid); polymer characterization; TGA; thermal degradation kinetics
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Funding
- Portuguese Foundation for Science and Technology (FCT) [NANO/NMed-SD/0156/2007, PTDC/CTM/73030/2006]
- FCT [SFRH/BPD/63148/2009]
- INL
- Spanish Ministry of Education [MAT2007-66759-C03-01]
- FEDER
- Conselleria de Sanidad (Generalitat Valenciana)
- Instituto de Salud Carlos III (Ministry of Science and Innovation)
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Poly(lactic acid) (PLA) electrospun membranes were obtained by electrospinning and characterized by scanning electron microscopy (SEM) and thermal analysis. The polymer membranes showed a random fiber distribution with a mean diameter of 1 mu m (+/-300 tun). Differential scanning calorimetry (DSC) experiments showed that the membranes had a glass transition, cold crystallization, and melting temperatures of 54, 90, and 151 degrees C, respectively. The kinetic study of thermal degradation of PLA under a nitrogen atmosphere was performed by means of thermogravimetry (TGA). It was found that the thermal decomposition kinetics of PLA could be interpreted in terms of a multi-step degradation mechanism. Several theoretical models were applied to the TGA data. The activation energies obtained by the Broido and Ozawa-Flynn-Wall (OFW) models were in good agreement with the value of the activation energy calculated by the Kissinger method.
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