CC BY
27LP-PS-7
Novel polymers for selective laser sintering: a new approach to 3D printing
S. Minaeva1, M. Syachina1, A. Mironov1, N. Minaev1, E. Krumins2, S. Howdle2, V. Popov1 institute of Photon Technologies of Federal Scientific Research Centre "Crystallography and Photonics" of Russian Academy of Sciences, Laboratory of Supercritical Fluid Technologies, Moscow, Russian Federation
2University of Nottingham, School of Chemistry, Nottingham, United Kingdom
New polymeric powder materials with specific dyes coating and particle sizes varied from 0,5 to 30,0 p,m for selective laser sintering (SLS) have been developed. Supercritical carbon dioxide was used as a processing medium for polyamide (PA) and ultrafine pollymethylmetactylate (PMMA) particles coating. This allows both coloring of the particles and SLS products from them for decorative purposes, as well as give an absorption properties to particles at a desirable wavelength (the polymer itself may have low absorption for this wavelength) for carrying out the process of surface-selective laser sintering SSLS.
Based on PA particles with the orange coating the structures were obtained by SSLS with 405 nm laser (Fig. 1). Laser beam-delivery optical system based on X-Y galvanoscanner and focusing microobjective has been developed for guidance and scanning laser radiation at a wavelength of 405 nm along the working surface of the polymer powder layers.
Ultrafine PMMA powders with given microparticles distribution in sizes (mean diameters - 0.5 to 3 |im) have been produced by dispersion polymerization in supercritical carbon dioxide. Experimental fine mechanical system to form homogeneous thin (ca. 20 p,m) layers of PMMA powders has been developed. Sintered polymer structures based on PMMA particles with addition of carbon black nanoparticles with a spatial resolution up to 30 p,m were fabricated. Similar structures from PMMA particles with blue coating were produced by SSLS technique using 405 nm laser (Fig. 2).
Fig. 1. The structure based on PA particles Fig. 2. The structure based on PMMA particles with the orange coating with the blue coating
This work was supported by the Ministry of Science and Higher Education within the State assignment FSRC «Crystallography and Photonics» RAS in part of SSLS process development and Russian Foundation of Basic Research (Project No. 17-53-10014 KO_a) in part of PMMA microparticles synthesis and characterization.
