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

IF 2.3 3区工程技术 Q2 MECHANICS Rheologica Acta Pub Date : 2022-12-01 DOI:10.1007/s00397-022-01377-6

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

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引用次数: 2

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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聚乳酸挤出3D打印修复性能流变学研究与建模

摘要本文的重点是对聚乳酸(PDLLA)的流变学研究，以模拟其在3D直接颗粒打印挤出(DPPE)过程中的愈合性能。首先表征了聚乳酸的粘弹性和沉积过程中的丝温。从温度、时间和打印速度三个方面考察了DPPE加工条件对打印效果的影响。为此，我们提出了一种考虑聚合物非等温弛豫并通过对流约束释放模型考虑纠缠率贡献的沉积层间过程诱导的界面厚度模型。因此，考虑到长丝沉积引起的链取向和迁移率，该模型量化了3d打印层之间的愈合程度。最后，通过将理论计算的愈合程度与试验拉伸性能和搭接剪切结果进行比较，验证了所提模型的有效性。图形抽象

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来源期刊

Rheologica Acta 物理-力学

CiteScore

4.60

自引率

8.70%

发文量

审稿时长

3 months

期刊介绍： "Rheologica Acta is the official journal of The European Society of Rheology. The aim of the journal is to advance the science of rheology, by publishing high quality peer reviewed articles, invited reviews and peer reviewed short communications. The Scope of Rheologica Acta includes: - Advances in rheometrical and rheo-physical techniques, rheo-optics, microrheology - Rheology of soft matter systems, including polymer melts and solutions, colloidal dispersions, cement, ceramics, glasses, gels, emulsions, surfactant systems, liquid crystals, biomaterials and food. - Rheology of Solids, chemo-rheology - Electro and magnetorheology - Theory of rheology - Non-Newtonian fluid mechanics, complex fluids in microfluidic devices and flow instabilities - Interfacial rheology Rheologica Acta aims to publish papers which represent a substantial advance in the field, mere data reports or incremental work will not be considered. Priority will be given to papers that are methodological in nature and are beneficial to a wide range of material classes. It should also be noted that the list of topics given above is meant to be representative, not exhaustive. The editors welcome feedback on the journal and suggestions for reviews and comments."

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