Advances in chemical modifications of polylactide biodegradable materials

Li, Nan; Chen, Jiansheng

doi:10.2991/ifeesm-17.2018.298

Cited by 1 publication

(1 citation statement)

References 22 publications

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“…[1][2][3][4]. Despite its many advantages, PLA is a brittle polymer with a low thermal deformation temperature, poor toughness and low crystallization rates [5][6][7][8][9][10]. These disadvantages limit its applicability, particularly for long-life (durable) items, including for the 3D printed grades designed for the automotive industry [11] which need key characteristics such as high temperature melt processability, significant toughness and durability [12].…”

Section: Introductionmentioning

confidence: 99%

Modulation of the PLLA Morphology through Racemic Nucleation to Reach Functional Properties Required by 3D Printed Durable Applications

Dimonie

Mathe

Iftime³

et al. 2021

Materials

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This paper presents an alternative for enhancing the durability of poly (L-lactide) (PLLA) by racemic nucleation following stereo-complexation with a selected poly (D-lactide) (PLDA). The compounds are obtained by melt blending of a PLLA grade, previously designed for 3D printing but with a low heat deflection temperature and impact resistance, with grades of PLDA differing in their molecular weight (Mw), D-lactide content (DS) and concentration. Our method considered how to reveal the racemic nucleation caused by stereo-complexation and its influence on functional properties. The FTIR study we performed showed that, depending on Mw, DS and concentration of the stereo-complexer (PDLA) used, bigger or smaller spectral changes can occur. The stereo-complexation was confirmed by the DSC analysis and, for the selected compound, by the POM, SEM, AFM microscopies, functional property and shapeability as 3D printing filaments. All the obtained results sustain the idea that, if a PLLA with Mw of 4.5 × 104 g·mol−1 is modified with PDLA with a medium Mw of 11.6 × 104 g·mol−1, medium DS of 4% and 1% concentration, a racemic nucleation is possible. It produces a racemic polylactic acid (PDLLA) with improved durability and good shapeability as 3D printing filaments. These results are explicable if the dependence of the intermolecular interactions appears between the PLLA and stereo-complexer PDLA. To enlarge the durable applicability of racemic polylactic acid (PDLLA), future research should identify other parameters controling the PLA stereo-complexing as the intensifying the mobility of the macromolecules, the finding of the optimal recemic cristalization window.

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