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Thickness‐Dependent Permeation Properties of Quenched and Standard Laser‐Sintered Polyamide 12 Sheets

  • The laser sintering of polymers is an additive manufacturing technology that is becoming increasingly established in the industrial environment. This study investigated the thickness‐ dependent permeation properties of laser‐sintered (LS) polymers as required to design and produce components with a special barrier performance to gaseous substances. Helium and oxygen permeation experiments were carried out on quenched and standard LS polyamide 12 (PA12) sheets generated with two, four, six, and eight layers at a constant powder layer thickness of 100 μm. The structural properties of the sheets were examined by differential scanning calorimetry, light microscopy, and X‐ray micro‐computed tomography. A reduction in thickness resulted in higher diffusion coefficients for both types of LS sheets. An explanation could be the large volume fraction of poorly sintered powder particles adhering to the surfaces and incomplete melting and low consolidation of the polymer at small thicknesses. The thickness‐dependency of the solubilityThe laser sintering of polymers is an additive manufacturing technology that is becoming increasingly established in the industrial environment. This study investigated the thickness‐ dependent permeation properties of laser‐sintered (LS) polymers as required to design and produce components with a special barrier performance to gaseous substances. Helium and oxygen permeation experiments were carried out on quenched and standard LS polyamide 12 (PA12) sheets generated with two, four, six, and eight layers at a constant powder layer thickness of 100 μm. The structural properties of the sheets were examined by differential scanning calorimetry, light microscopy, and X‐ray micro‐computed tomography. A reduction in thickness resulted in higher diffusion coefficients for both types of LS sheets. An explanation could be the large volume fraction of poorly sintered powder particles adhering to the surfaces and incomplete melting and low consolidation of the polymer at small thicknesses. The thickness‐dependency of the solubility coefficients was the opposite, especially for the standard LS sheets, which might be related to the larger pore volume in thicker sheets. As both effects compensated for each other, nearly constant permeation coefficients for all thicknesses were observed. The results provide further insights into different material characteristics of thin LS PA12 structures and offer new information on factors relevant to their solution and diffusion behavior.show moreshow less

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Metadaten
Author:Anna LiebrichORCiD, Horst-Christian LangowskiORCiDGND, Bernd R. PinzerORCiD
DOI:https://doi.org/10.3390/polym13040603
Identifier:2073-4360 OPAC HS OPAC extern
Parent Title (English):Polymers
Publisher:MDPI
Place of publication:Basel
Editor:Alexander Böker
Document Type:Article
Language:English
Date of Publication (online):2021/02/17
Year of first Publication:2021
Volume:13
Issue:4
Article Number:603
Number of pages:18 Seiten
First Page:1
Last Page:18
Institutes:IMS - Institut für Maschinelles Sehen
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften
Open Access:open_access
Research focus:FSP2: Mobilität
FSP3: Produktion
Publication Lists:Pinzer, Bernd
Publication reviewed:begutachtet
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International
Release Date:2021/07/22
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