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Amorphous rigidification and cooperativity drop in semi−crystalline plasticized polylactide

Article dans une revue avec comité de lecture
Author
VAROL, N.
970 Groupe de physique des matériaux [GPM]
DELPOUVE, Nicolas
970 Groupe de physique des matériaux [GPM]
ARAUJO, Steven
970 Groupe de physique des matériaux [GPM]
DOMENEK, Sandra
419361 Université Paris-Saclay
GUINAULT, Alain
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
GOLOVCHAK, Roman
441141 Department of Physics & Astronomy [Clarksville]
INGRAM, A.
DELBREILH, Laurent
970 Groupe de physique des matériaux [GPM]
DARGENT, Eric
970 Groupe de physique des matériaux [GPM]

URI
http://hdl.handle.net/10985/18404
DOI
10.1016/j.polymer.2020.122373
Date
2020
Journal
Polymer

Abstract

Plasticization of amorphous polylactide shifts the glass transition and extends its temperature range of crystallization to lower temperatures. In this work, we focus on how low−temperature crystallization impacts the mobility of the amorphous phase. Plasticizer accumulates in the amorphous phase because it is excluded from the growing crystal. The formation of rigid amorphous fraction is favored by the low crystallization temperature. It reaches values up to 50% in plasticized polylactide. The increase in the content of rigid amorphous fraction coincides with both the increase of free volume quantified by positron annihilation lifetime spectroscopy, and the decrease in the cooperativity length obtained from the temperature fluctuation approach. The drop of cooperativity is interpreted in terms of mobility gradient due to the amorphous rigidification.

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