Impact of Nanoconfinement on Polylactide Crystallization and Gas Barrier Properties
TypeArticles dans des revues avec comité de lecture
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 amorphous phase properties. The multilayer coextrusion process was used to confine PLLA between two amorphous polymers (polystyrene, PS; and polycarbonate, PC), which have different chemical affinities with PLLA. Confined PLLA layers of approximately 20 nm thickness were obtained. The multinanolayer materials were annealed at different temperatures to obtain PLLA crystallites with distinct polymorphs. PLLA annealed in PC/PLLA films at 120 °C afforded a crystallinity degree up to 65%, and PLLA annealed in PC/PLLA or PS/PLLA films at 85 °C had a crystallinity degree of 45%. WAXS measurements evidenced that the PLLA lamellas between PS layers had a mixed in-plane and on-edge orientation. PLLA lamellas between PC layers were uniquely oriented in-plane. DMA results evidenced a shift of the PC glass transition toward lower temperature, suggesting the possible presence of an interphase. The development of the rigid amorphous fraction (RAF) in the amorphous phase during annealing was impacted by the confiner polymer. The RAF content of semicrystalline PLLA was about 15% in PC/PLLA, whereas it was neglectable in PS/PLLA. The oxygen barrier properties appeared to be governed by RAF content, and no impact of the PLLA polymorph or the crystalline orientation was observed. This study shows that the confinement of PLLA on itself does not impact barrier properties but that the proper choice of the confiner polymer can lead to decrease the phase coupling which creates the RAF. It is the prevention of RAF that decreases permeability.
Files in this item
Showing items related by title, author, creator and subject.
FERNANDES 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 ...
Reduced physical aging rates of polylactide in polystyrene/polylactide multilayer films from fast scanning calorimetry MONNIER, Xavier; FERNANDES NASSAR, Samira; DOMENEK, Sandra; GUINAULT, Alain; SOLLOGOUB, Cyrille; DARGENT, Eric; DELPOUVE, Nicolas (Elsevier, 2018)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 ...
Forced assembly by multilayer coextrusion to create oriented graphene reinforced polymer nanocomposites LI, Xiguang; MCKENNA, Gregory; MIQUELARD-GARNIER, Guillaume; GUINAULT, Alain; SOLLOGOUB, Cyrille; REGNIER, Gilles; ROZANSKI, Artur (ELSEVIER, 2013)A potential advantage of platelet-like nanofillers as nanocomposite reinforcements is the possibility of achieving two-dimensional stiffening through planar orientation of the platelets. The ability to achieve improved ...
RUELLAN, Alexandre; GUINAULT, Alain; SOLLOGOUB, Cyrille; DUCRUET, Violette; DOMENEK, Sandra (Wiley, 2015)Changes in the thermomechanical properties of polylactide (PLA) plasticized by two biodegradable and biobased molecules, Polysorb ID37 (PID37) and squalene, were compared to formulations with petroleum-based plasticizers, ...
RUELLAN, Alexandre; GUINAULT, Alain; SOLLOGOUB, Cyrille; CHOLLET, Guillaume; AIT-MADA, Aziza; DUCRUET, Violette; DOMENEK, Sandra (Budapest University of Technology and Economics, 2015)The use of industrial by-products of the vegetable oil industry as ductility increasing additives of polylactide (PLA) was investigated. Vegetable oil deodorization condensates were melt-blended by twin-screw extrusion up ...