Crystalline structure of annealed polylactic acid and its relation to processing

By T. Tábi, I. Sajó, Ferenc Szabó, A. S. Luyt, József Gábor Kovács. 2010

311 citations recorded by the source corpus.

This paper focuses on the crystalline structure of injection moulding grade poly(lactic acid) (PLA) and the effect of crystalline structure on the processing. The research is induced by the significant differences in crystallinity of the pure PLA resin, and the injection moulded product, and thus the reprocessing of PLA products. 2 mm thick PLA sheets were injection moulded and re-crystallized in a conventional oven at 60-140°C, for 10-60 minutes to achieve various crystalline contents. The properties of these sheets were investigated by dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), and wide angle X-ray diffraction (WAXD). In a processing plant the rejected parts are recycled and reused as raw material for further cycles, accordingly the various crystalline content PLA products were reprocessed as a resin, to investigate the processing itself. When PLA products are reprocessed, due to the adherent feature of amorphous PLA processing difficulties may occur. This adherent effect of the amorphous PLA was investigated and characterized.

Subfields: Automotive Engineering, Biomaterials, Process Chemistry and Technology

View Paper: https://www.semanticscholar.org/paper/ce68d057111d73d9ff73bf1117b49e8cb043e56d

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. Javaid Butt
2. R. Bhaskar

In Biomaterials

1. József Gábor Kovács
2. Javaid Butt
3. T. Tábi
4. R. Bhaskar
5. A. S. Luyt

Citations in the corpus

• Investigating the Effects of Annealing on the Mechanical Properties of FFF-Printed Thermoplastics (2020, methodology): “Therefore, it is a useful post-process for the PLA material [37,38].”
• Mechanical properties of CF-reinforced PLA parts manufactured by fused deposition modeling (2019, background): “As crystallinity influences many properties such as hardness, modulus, tensile strength, stiffness, and melting point, it becomes one of the selection criteria.21 Tábi et al.20 analyzed the crystalline structure of PLA after injection molding and studied the effect of crystalline structure on the p”
• Crystallization kinetics of poly(lactic acid)-talc composites (2011, unknown): “Two overlapping melting processes are shown by the composites containing talc (Tm: 147 and 152°C) which probably correspond to PLA crystallized respectively on heating and on cooling [11].”
• Comparison of injection moulded, natural fibre-reinforced composites with PP and PLA as matrices (2012, background): “In PLA biodegradation, moisture susceptibility is the primary driving force and involves the following four steps: water absorption, ester cleavage forming oligomers, solubilisation of oligomer fractions, and diffusion of bacteria into soluble oligomers.(31,34) The mass loss of the composites follow”
• The effects of PLA color on material properties of 3-D printed components (2015, unknown): “The broad central peak between 16-17 in the XRD in Figures 2 and 3 and the increasing crystalline sharp peak is consistent with the annealing to create a larger crystalline volume fraction observed by Tabi et al., and verified with differential scanning calorimetry [42].”
• Review of Multifarious Applications of Poly (Lactic Acid) (2016, unknown): “pens in injection moulding process([14,15]).”