Experimental study on the effect of filament-extrusion rate on the structural, mechanical and thermal properties of material extrusion 3D-printed polylactic acid (PLA) products

Progress in Additive Manufacturing, Journal Year: 2024, Volume and Issue: unknown

Published: May 12, 2024

Abstract Material extrusion (MEX), also commonly referred to as fused deposition modeling (FDM) or filament fabrication (FFF) is currently one of the most used additive manufacturing techniques. The quality 3D-printed objects fabricated by MEX methods highly relies on various printing parameters, which so-called multiplier ( k ). In this study, parts were prepared technique during material feeding rate was adjusted varying in range 97–105% = 0.97–1.05). tested for their geometrical, structural, mechanical, and thermal conductivity properties. Based computed tomographic analysis scanning electron microscopic images, increasing parameter resulted smaller voids, along with gradually decreasing porosity (from 5.82 0.05%). Parallel defects, improved from 0.157 0.188 W/mK determined light-flash technique. On other hand, when set ≥ 1.03 geometrical accuracy declined, size specimens considerably increased relative nominal values, especially X–Y directions due excess getting “squeezed” sides specimens. This latter phenomenon formation a number stress concentration sites, manifested decrease mechanical Accordingly, tensile, flexural, impact strength samples up 1.03; however, above that it dropped considerably.

Language: Английский

Promising Electromagnetic Interference Shielding Materials: Hybrid Fillers Reinforced Bio‐Based Composites

Journal of Applied Polymer Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 22, 2025

ABSTRACT Electromagnetic pollution, also known as electromagnetic interference (EMI) issues, is a growing concern electronic and telecommunication technologies advance. The resulting urgent demand for EMI shielding materials underscores the need development of high‐performance, environmentally friendly materials. Here, we assess impact multiscale carbon‐based hybrid filler on performance polyamide 11/poly(lactic acid) composites. effects amounts (0.5 to 5 wt%) graphene nanoplatelets (GNPs) multiwalled carbon nanotube (MWCNT) nanofillers in fiber (CF)/GNP CF/MWCNT‐reinforced composites were comparatively investigated. fabricated through melt blending/compression molding subsequently characterized terms morphological, length, electrical properties, effectiveness (EMI SE). Morphological imaging revealed good adhesion between fillers matrix, indicating favorable interaction. length analysis demonstrated that lengths longer CF/GNP than CF/MWCNT. SE measurements showed synergistic X Ku bands. highest values at 10 GHz 16 20CF‐5GNP composite 34 40 dB, respectively.

Language: Английский

Analysis of the effect of boric acid and compatibilizer addition to polylactic acid/basalt fiber composites

Polymer Composites, Journal Year: 2024, Volume and Issue: 45(16), P. 15005 - 15019

Published: July 17, 2024

Abstract The objective of this study is to improve the properties polylactic acid (PLA), a biopolymer produced from renewable resources, without compromising its environmentally friendly “natural composite” properties. aim was expand application range PLA by making it suitable for production high performance composites. With in mind, decided use inorganic and materials such as basalt fiber (BF) boric (BA) reinforcements. Adhesive wear tensile tests were used investigate tribological mechanical Differential scanning calorimetry (DSC) dimensional stability analysis (DSA) methods thermal Scanning electron microscopy also morphological samples. In addition, matrix modification process using Joncryl®, an epoxy‐based chain extender chemical, applied enhance interfacial interaction between composite components improving dispersion reinforcing materials. As result characterization tests, observed that significant improvement material type containing 10 wt% BF, 0.25 BA 2 Joncryl® achieved. A 19% increase strength compared with unreinforced PLA, while sharp peak coefficient friction (COF) curve shifted 20 m 60 m. result, has been presented BF can be produce will serve sectors where need intense, especially automotive, aerospace aviation sectors. Highlights composites improved simultaneous addition Joncryl®. structural polymer, have characteristic. natural developed.

Language: Английский