Material valorisation of amorphous polylactide. Influence of thermo-mechanical degradation on the morphology, segmental dynamics, thermal and mechanical performance

By J. D. Badia, E. Strömberg, S. Karlsson, A. Ribes‐Greus. 2012

143 citations recorded by the source corpus.

This paper reports the effects of multiple mechanical recycling on the structure and properties of amorphous polylactide (PLA). The influence of the thermo-mechanical degradation induced by means of five successive injection cycles was initially addressed in terms of macroscopic mechanical properties and surface modification. A deeper inspection on the structure and morphology of PLA was associated to the thermal properties and viscoelastic behaviour. Although FT-IR analysis did not show significant changes in functional groups, a remarkable reduction in molar mass was found by viscometry. PLA remained amorphous throughout the reprocessing cycles, but the occurrence of a cold-crystallization during DSC and DMTA measurements, which enthalpy increased with each reprocessing step, suggested chain scission due to thermo-mechanical degradation. The effect of chain shortening on the glass-rubber relaxation studied by DMTA showed an increase in free volume affecting the segmental dynamics of PLA, particularly after the application of the second reprocessing step, in connection to the overall loss of performance showed by the remaining properties.

Subfields: Automotive Engineering, Biomaterials, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/bea90351bcaf9dc23234965bab11974a1742bb0a

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Automotive Engineering

1. I. Jakubowicz
2. Azadeh Soroudi
3. A. Ribes‐Greus
4. J. D. Badia

In Biomaterials

1. I. Jakubowicz
2. Azadeh Soroudi
3. J. D. Badia
4. A. Ribes‐Greus

In Polymers and Plastics

1. J. D. Badia
2. I. Jakubowicz
3. Azadeh Soroudi
4. A. Ribes‐Greus

Citations in the corpus

• Recycling of bioplastics, their blends and biocomposites: A review (2013, methodology): “[25] also confirmed that during the multiple mechanical recycling of amorphous PLA (95.”
• Mechanical recycling of polylactide, upgrading trends and combination of valorization techniques (2016, methodology): “The reported studies on the topography of reprocessed PLA generally show pictures obtained by Scanning Electron Microscopy (SEM) [35].”