Effect of the simultaneous biaxial stretching on the structural and mechanical properties of PLA, PBAT and their blends at rubbery state

Racha Al-Itry (1) , Khalid Lamnawar (2, 3) , Abderrahim Maazouz (1) , Noëlle Billon (4) , Christelle Combeaud (4)

1 IMP - Ingénierie des Matériaux Polymères
2 LaMCoS - Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne]
3 MULTIMAP - Mécanique multiphysique pour les matériaux et les procédés
4 CEMEF - Centre de Mise en Forme des Matériaux

This works deals with the study of the strain-induced structural changes of PLA, PBAT and their blends with/without multi-functional styrene-acrylic oligomers (Joncryl ADR-4368). The films were prepared through a single-screw extrusion. Uni and bi-axially simultaneous stretching, at a temperature above the glass transition temperature, were performed. The experimental conditions were chosen so as not to generate significant thermal crystallization during tests duration. Stretching induced semi-crystalline films with a supposed in-plane mechanical isotropy. Their structural, morphological and thermo-mechanical properties were characterized using dynamic mechanical and thermal analysis (DMTA), differential scanning calorimetry (DSC), wide-angle X-ray scattering (WAXS), and transmission electron microscopy (TEM). The strain-induced crystals of PLA combined mesophase and alpha'-form crystals. Besides, the stretched PBAT was found to be composed of mixed-crystal structure of BT and BA units in a PBT-like crystal form. The Joncryl addition promoted significant changes on the crystallization kinetics of PLA without affecting the crystallization kinetic of PBAT. In fact, Joncryl acted as a nucleating agent making thus faster the thermal crystallisation of PLA. In parallel, the strain induced crystallisation in PLA was accelerated and stresses increased. The same effect was still observed in the PLA_PBAT blends.

Mots clés: Biodegradable polymers; Uniaxial stretching; Simultaneous biaxial stretching; Strain induced crystallization

Domaines: Génie mécanique [physics.class-ph]; Matériaux; Matériaux et structures en mécanique [physics.class-ph]; Mécanique des matériaux [physics.class-ph]

Racha Al-Itry, Khalid Lamnawar, Abderrahim Maazouz, Noëlle Billon, Christelle Combeaud. Effect of the simultaneous biaxial stretching on the structural and mechanical properties of PLA, PBAT and their blends at rubbery state. European Polymer Journal, 2015, European Polymer Journal 68 (2015), 68, pp.288-301. ⟨10.1016/j.eurpolymj.2015.05.001⟩. ⟨hal-01152605⟩