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New approach to the double melting peak of poly(l-lactic acid) observed by DSC

Published online by Cambridge University Press:  06 March 2012

Carlos A. Gracia-Fernández ,
Silvia Gómez-Barreiro ,
Jorge López-Beceiro ,
Salvador Naya  and
Ramón Artiaga
Carlos A. Gracia-Fernández
Affiliation:
Thermal Analysis, Rheology and Microcalorimetry Applications, TA Instruments – Waters Cromatografía, 28108 Alcobendas Madrid, Spain
Silvia Gómez-Barreiro
Affiliation:
Department of Applied Physics, CESUGA, University College of Dublin, 15190 A Coruña, Spain
Jorge López-Beceiro
Affiliation:
University of A Coruña, Higher Polytechnic School, Campus de Esteiro, Ferrol 15403, Spain
Salvador Naya
Affiliation:
University of A Coruña, Higher Polytechnic School, Campus de Esteiro, Ferrol 15403, Spain
Ramón Artiaga*
Affiliation:
University of A Coruña, Higher Polytechnic School, Campus de Esteiro, Ferrol 15403, Spain
*
a)Address all correspondence to this author. e-mail: ramon.artiaga@udc.es
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Abstract

Poly(l-lactic acid) (PLLA) is one of the most studied biopolymers nowadays. Due to its good performance, it constitutes an alternative to petrochemical-derived polymers. It was largely studied by differential scanning calorimetry (DSC) and temperature-modulated DSC. Nevertheless, there is an ongoing debate of what happens at the overlapping melting processes. In the present work, the experimental setups are discussed. Different modulation conditions are proposed for the study of the glass transition, cold crystallization, and the two reported melting processes. Finally, the experimental results allowed to measure the heat capacity change at the cold crystallization and a correct interpretation of what happens at the reported double melting peak of PLLA, which involves the existence of three crystalline structures.

Keywords

PolymerCrystal growthDifferential thermal analysis
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 10: Focus Issue: Crystallization Processes in Polymer-Based Materials , 28 May 2012 , pp. 1379 - 1382
Copyright
Copyright © Materials Research Society 2012

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References

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