Influence of LLDPE on the mechanical properties improvement of 3D printed POE/LLDPE blends

IF 3.8 4区工程技术 Q2 CHEMISTRY, APPLIED Journal of Vinyl & Additive Technology Pub Date : 2024-02-26 DOI:10.1002/vnl.22099

Tiejun Liu, Ke Chen

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Abstract

Polyolefins and polyolefin elastomers (POEs) are widely used in various applications due to their unique properties. However, their use in 3D printing has been limited due to challenges such as excessive softness, shrinkage, warpage, and poor mechanical properties. In this study, two strategies were employed to enhance the performance of POEs in 3D printing. First, POE was blended with 10%, 30%, and 50% percentages of linear low-density polyethylene (LLDPE) to improve the material's mechanical properties and printability. Second, a specialized printer called a pneumatic feeding fused granule fabrication (FGF) printer was used. This printer allows for the direct printing of material granules, eliminating the need for filaments and resolving filament-related problems. To evaluate the quality of the printed parts, tensile tests, dynamic mechanical thermal analysis (DMTA), and scanning electron microscopy (SEM) imaging were conducted. The printed parts showed desirable tensile properties (with approximately 3000% elongation at break and approximately 12 MPa tensile strength). Compression tests were also conducted on cubic structures with varied composition ratios and printing patterns such as grid, triangle, and honeycomb. The main purpose of this research was to explore the energy absorption capabilities of the printed blends. The results of our study showed that blending POE with LLDPE improved printability, tensile strength, energy absorption, and compressive properties. The blend with 50% LLDPE and honeycomb structure exhibited the best compressive and energy absorption properties.

Highlights

Blending of POE and LLDPE using melt mixing with three different blending ratios.
Successful 3D printing with the fused granule fabrication technique.
Investigating mechanical properties, microstructure, and thermal analysis.
125% increase in ultimate tensile strength by increasing LLDPE.
Achieving the highest energy absorption for the 3D printed honeycomb structure.

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LLDPE 对改善 3D 打印 POE/LLDPE 混合物机械性能的影响

聚烯烃和聚烯烃弹性体（POE）因其独特的性能而被广泛应用于各种领域。然而，由于存在过软、收缩、翘曲和机械性能差等问题，它们在三维打印中的应用受到了限制。本研究采用了两种策略来提高 POE 在 3D 打印中的性能。首先，将 POE 与 10%、30% 和 50% 的线性低密度聚乙烯（LLDPE）混合，以提高材料的机械性能和打印性能。其次，使用了一种名为气动进料熔融颗粒制造（FGF）打印机的专用打印机。这种打印机可以直接打印材料颗粒，无需使用长丝，解决了与长丝相关的问题。为评估打印部件的质量，进行了拉伸试验、动态机械热分析（DMTA）和扫描电子显微镜（SEM）成像。印刷部件显示出理想的拉伸性能（断裂伸长率约为 3000%，拉伸强度约为 12 兆帕）。此外，还对具有不同成分比和印刷图案（如网格、三角形和蜂窝）的立方体结构进行了压缩测试。这项研究的主要目的是探索印刷混合物的能量吸收能力。研究结果表明，将 POE 与 LLDPE 混合可改善印刷性、拉伸强度、能量吸收和压缩性能。含有 50% LLDPE 和蜂窝结构的混合物具有最佳的抗压和能量吸收性能。

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来源期刊

Journal of Vinyl & Additive Technology 工程技术-材料科学：纺织

CiteScore

5.40

自引率

14.80%

发文量

审稿时长

>12 weeks

期刊介绍： Journal of Vinyl and Additive Technology is a peer-reviewed technical publication for new work in the fields of polymer modifiers and additives, vinyl polymers and selected review papers. Over half of all papers in JVAT are based on technology of additives and modifiers for all classes of polymers: thermoset polymers and both condensation and addition thermoplastics. Papers on vinyl technology include PVC additives.