Abstract
Polyoxymethylene (POM) is one of the most popular thermoplastic polymers used in the industry. Therefore, the interest in its potential applications in rapid prototyping is understandable. Nevertheless, its low dimensional stability causes the warping of 3D prints, limiting its applications. This research aimed to evaluate the effects of POM modification with ethylene-vinyl acetate (EVA) (2.5, 5.0, and 7.5 wt.%) on its processing (by melt flow index), structure (by X-ray microcomputed tomography), and properties (by static tensile tests, surface resistance, contact angle measurements, differential scanning calorimetry, and thermogravimetric analysis), as well as very rarely analyzed emissions of volatile organic compounds (VOCs) (by headspace analysis). Performed modifications decreased stiffness and strength of the material, simultaneously enhancing its ductility, which simultaneously increased the toughness even by more than 50% for 7.5 wt.% EVA loading. Such an effect was related to an improved linear flow rate resulting in a lack of defects inside the samples. The decrease of the melting temperature and the slight increase of thermal stability after the addition of EVA broadened the processing window for 3D printing. The 3D printing trials on two different printers showed that the addition of EVA copolymer increased the possibility of a successful print without defects, giving space for further development.
Highlights
Three-dimensional (3D) printing, known as additive manufacturing, is described as the incremental digital technology that allows creating physical objects by successive addition of material.This manufacturing technology has originated from three-dimensional (3D) layer-by-layer fabrication of computer-aided design (CAD) drawing [1].Three-dimensional printing is used worldwide to produce customizable designs and small series production in many fields, including the automotive and aerospace industries [1,2]
The present study aimed to find the optimum addition and combination of thermoplastic polymer ethylene-vinyl acetate (EVA) to semicrystalline resin POM that may lead to improved 3D printability of this construction material
This study aimed to investigate the properties of polyoxymethylene modified with 2.5, 5.0, aimed to investigate polyoxymethylene modified in with
Summary
Three-dimensional (3D) printing, known as additive manufacturing, is described as the incremental digital technology that allows creating physical objects by successive addition of material.This manufacturing technology has originated from three-dimensional (3D) layer-by-layer fabrication of computer-aided design (CAD) drawing [1].Three-dimensional printing is used worldwide to produce customizable designs and small series production in many fields, including the automotive and aerospace industries [1,2]. Materials 2020, 13, 2912 release or commercialization of tested products, prototypes printed with rapid prototyping technology can be useful in project design validation, in assessing the resolution quality, and in material stability checks This gives significant advantages in future processing, helps streamline industrial development with small series rapid retooling individualization, and influences the end price of the prototype with linear costs that depend mostly on the number of pieces produced [2,3]. A wide range of parameters makes this process complex to understand and control Such an effect is related to the interdependence between the physicochemical properties of the final product [5], which, according to Cuan-Urquizo et al [6], results in the anisotropic nature of this technology. Multiple works conducted on fused filament fabrication (FFF) raised the topic of raster pattern and angle influence on the mechanical properties of specimens [7,8]
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