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Polymer-Plastics Technology and Engineering Volume 53, 2014 - Issue 9
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Original Articles

Effect of Ultrasound on Molecular Structure Development of Polylactide

Wenting Bao The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, China
,
Hong Wu The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, ChinaCorrespondence[email protected]
,
Shaoyun Guo The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, China
,
Anant Paradkar Center for Pharmaceutical Engineering Science, University of Bradford, Bradford, United Kingdom
,
Adrian Kelly Advanced Materials RKT Center, Polymer IRC, University of Bradford, Bradford, United Kingdom
,
Elaine Brown Advanced Materials RKT Center, Polymer IRC, University of Bradford, Bradford, United Kingdom
&
Phil Coates Advanced Materials RKT Center, Polymer IRC, University of Bradford, Bradford, United Kingdom
 show all
Pages 927-934 | Published online: 28 May 2014
 
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Abstract

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.

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