Effect of Ultrasound on Molecular Structure Development of Polylactide
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KeywordsCombination; Degradation; Molecular structure; Polylactide; Ultrasound
Permissions© 2014 Taylor and Francis. Full-text reproduced in accordance with the publisher’s self-archiving policy. This is an Author's Original Manuscript of an article published by Taylor & Francis in Polymer-Plastics Technology and Engineering on 20 May 2014. It is available online at http://dx.doi.org/10.1080/03602559.2014.886062.
In this work, effect of ultrasound on molecular structure development of Polylactide (PLA) was studied. It was found that the intrinsic viscosity of PLA decreased with increasing treating time, temperature and ultrasound time. Different from traditional thermal degradation of PLA, the degradation of PLA under ultrasound treatment showed that chain scission and chain combination of PLA competed with each other in the degradation process, which could be divided into two steps. The mechanism of ultrasound degradation of PLA was proposed. Furthermore, Thermal properties were characterized by DSC to show heat and ultrasound effects on molecular structure development of PLA.