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Rheologica Acta

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01-12-2022 | Original Contribution

Rheological investigation and modeling of healing properties during extrusion-based 3D printing of poly(lactic-acid)

Authors: Xavier Lacambra-Andreu, Xavier P. Morelle, Abderrahim Maazouz, Jean-Marc Chenal, Khalid Lamnawar

Published in: Rheologica Acta | Issue 1/2023

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Abstract

The focus of the present paper is the rheological study of poly(D,L-lactic-acid) (PDLLA) towards a modeling of their healing properties during 3D direct pellet printing extrusion (DPPE). The viscoelastic properties of PDLLA and the filament temperature during deposition are first characterized. The influence of DPPE processing conditions is investigated in terms of temperature, time, and printing speed. For this, we propose a modeling of the process-induced interphase thickness between two deposited layers considering the non-isothermal polymer relaxation and accounting for the contribution of entanglement rate through the Convective constraint release model. Hence, taking into account the induced chain orientation and mobility coming from filament deposition, this model quantifies the degree of healing between 3D-printed layers. Eventually, the proposed model is validated by comparing the theoretically calculated degree of healing with experimental tensile properties and lap shear results.

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previous article Experimental separation of the onset of slip and sharkskin melt instabilities during the extrusion of silica-filled, styrene–butadiene rubber compounds

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Title: Rheological investigation and modeling of healing properties during extrusion-based 3D printing of poly(lactic-acid)
Authors: Xavier Lacambra-Andreu
Xavier P. Morelle
Abderrahim Maazouz
Jean-Marc Chenal
Khalid Lamnawar
Publication date: 01-12-2022
Publisher: Springer Berlin Heidelberg
Published in: Rheologica Acta / Issue 1/2023
Print ISSN: 0035-4511
Electronic ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-022-01377-6

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