Reduced physical aging rates of polylactide in polystyrene/polylactide multilayer films from fast scanning calorimetry
Article dans une revue avec comité de lecture
The physical aging behavior of amorphous polylactide constrained against polystyrene in layers of 300 nm, thanks to the layer–multiplying co–extrusion process, was investigated by fast–scanning calorimetry (FSC). By cooling down the sample from the liquid state to the glassy one at very fast scanning rates, it was possible to investigate the structural relaxation of the polymer glass at high temperatures for which the time needed to reach the equilibrium was shortened. Therefore it was possible to perform the study of physical aging in experimental conditions providing an expanded view of the structural relaxation for short aging times. Taking benefit of this property, it was highlighted that the aging kinetics of polylactide occurred significantly slower in the multilayer film, in comparison with a bulk amorphous film. The process of recovery in the multilayer system was found to occur at similar rates, or even slower, than in a three–layer film in which polylactide reached its maximum extent of crystallinity. This was attributed to mobility hindrance that might be inherent to the extrusion conditions or associated with the presence of capped interfaces with polystyrene.
Files in this item
Showing items related by title, author, creator and subject.
Article dans une revue avec comité de lectureFERNANDES NASSAR, Samira; GUINAULT, Alain; DELPOUVE, Nicolas; DIVRY, Véronique; DUCRUET, Violette; SOLLOGOUB, Cyrille; DOMENEK, Sandra (Elsevier, 2017)Semicrystalline polylactide (PLA) films with controlled morphology were produced by thermal crystallization to optimize the oxygen barrier properties. The crystalline morphology of PLA at the scales of the lamella and the ...
Article dans une revue avec comité de lectureFERNANDES-NASSAR, Samira; DELPOUVE, Nicolas; SOLLOGOUB, Cyrille; GUINAULT, Alain; STOCLET, Grégory; RÉGNIER, Gilles; DOMENEK, Sandra (American Chemical Society, 2020)The barrier properties of poly(l-lactide) (PLLA) were investigated in multinanolayer systems, probing the effect of confinement, the compatibility between the confining and the confined polymer, crystal orientation, and ...
Article dans une revue avec comité de lectureARAUJO, Steven; DELPOUVE, Nicolas; DOMENEK, Sandra; GUINAULT, Alain; GOLOVCHAK, Roman; SZATANIK, Roman; INGRAM, Adam; FAUCHARD, Cyrille; DELBREILH, Laurent; DARGENT, Eric (American Chemical Society, 2019)The experimental evidence of the increase of activation energy associated with the super Arrhenius behavior governing amorphous polylactide by free volume variations has been obtained through a combination of calorimetric, ...
Article dans une revue avec comité de lectureMONNIER, Xavier; DELPOUVE, Nicolas; BASSON, N; GUINAULT, Alain; DOMENEK, Sandra; SAITER, A; MALLON, P.E; DARGENT, Eric (Elsevier, 2015)The molecular dynamics in the amorphous phase of electrospun fibers of polylactide (PLA) has been investigated using the cooperative rearranging region concept. An unusual and significant increase of the cooperativity ...
Article dans une revue avec comité de lectureVAROL, N.; DELPOUVE, Nicolas; ARAUJO, Steven; DOMENEK, Sandra; GUINAULT, Alain; GOLOVCHAK, Roman; INGRAM, A.; DELBREILH, Laurent; DARGENT, Eric (Elsevier, 2020)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 ...