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Fragility of short‐chain poly(lactic acid)s derivatives by combining dielectric spectroscopy and fast scanning calorimetry
Author(s) -
Moghaddam Sareh Mahmoudian,
Quelennec Blandine,
Delpouve Nicolas,
Atawa Bienvenu,
Delbreilh Laurent,
Saiter–Fourcin Allisson,
Passaglia Elisa,
Fiori Stefano
Publication year - 2021
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20210129
Subject(s) - fragility , cooperativity , glass transition , lactic acid , plasticizer , polyester , molecular mass , polymer chemistry , dielectric , chemistry , materials science , polymer , chemical engineering , organic chemistry , biochemistry , optoelectronics , biology , bacteria , engineering , genetics , enzyme
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.