Fragility of short‐chain poly(lactic acid)s derivatives by combining dielectric spectroscopy and fast scanning calorimetry

Low‐molecular‐mass bio‐polyesters, such as lactic acid oligomers, constitute a growing category of plasticizers for poly (lactic acid), since they show good compatibility and are respectful of the environment. This study focuses on the glass transition of a series of oligomers with different molecul...

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Bibliographic Details
Published in:Journal of polymer science 2021-07, Vol.59 (14), p.1571-1577
Main Authors: Moghaddam, Sareh Mahmoudian, Quelennec, Blandine, Delpouve, Nicolas, Atawa, Bienvenu, Delbreilh, Laurent, Saiter–Fourcin, Allisson, Passaglia, Elisa, Fiori, Stefano
Format: Article
Language:English
Subjects:
Condensed Matter
cooperativity
DSC
Engineering Sciences
Fragility
Glass transition
Heat measurement
Materials
Materials Science
Molecular weight
Oligomers
Physics
PLA
Polyester resins
Polylactic acid
relaxation
Soft Condensed Matter
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Summary:Low‐molecular‐mass bio‐polyesters, such as lactic acid oligomers, constitute a growing category of plasticizers for poly (lactic acid), since they show good compatibility and are respectful of the environment. This study focuses on the glass transition of a series of oligomers with different molecular weights, with the aim of investigating how their associated dynamics occur. Dielectric and calorimetric results are combined to study the molecular mobility in a large temperature range. In comparison with poly (lactic acid), the oligomers exhibit a lower fragility index and smaller cooperative rearranging regions. Among oligomers, the fragility is clearly dependent on the molecular weight, whereas the variations of the cooperativity are subtler.
ISSN:2642-4150
0022-3832
2642-4169
1542-6238
DOI:10.1002/pol.20210129