scholarly journals Surface modification of the laser sintering standard powder polyamide 12 by plasma treatments

2018 ◽  
Vol 15 (7) ◽  
pp. 1800032 ◽  
Author(s):  
Alaa Almansoori ◽  
Robert Masters ◽  
Kerry Abrams ◽  
Jan Schäfer ◽  
Torsten Gerling ◽  
...  
Keyword(s):  
Surface Modification ◽  
Laser Sintering ◽  
Polyamide 12 ◽  
Plasma Treatments ◽  
Standard Powder

scholarly journals Influence of the Surface Modification of Calcium Carbonate on Polyamide 12 Composites

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1295
Author(s):  
Fabio Ippolito ◽  
Gunter Hübner ◽  
Tim Claypole ◽  
Patrick Gane
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Calcium Carbonate ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Hexanoic Acid ◽  
Mineral Filler ◽  
Polyamide 12 ◽  
Twin Screw ◽  
Surface Modified

In previous investigations, it was found that the thermal properties of a polyamide 12 compound can be manipulated, using a designed filler, to improve the melting as well as crystallization behavior, determined for selective laser sintering. A common downside of the introduction of a non-flexing mineral filler is the reduction of the mechanical properties, such as ductility. This paper investigates the influence of content and surface modification of limestone on the mechanical properties. The aim is to understand the effect of an optimized coupling agent on the properties of a compound, containing polyamide 12 filled with 10 wt % of surface modified calcium carbonate. A range of four mineral filler modifications was chosen to investigate their coupling effect, namely 6-amino hexanoic acid, ε-caprolactam, l-arginine or glutamic acid. The in advance surface modified fillers were then each used in combination with the polyamide 12 in a twin-screw extrusion process. With an optimized surface modifying agent, the tensile strength as well as elongation at break can be improved in comparison with uncoated filler implementation, such that up to 60% of the loss of ductility and toughness of a final part when using an untreated filler could be regained using an optimized surface modifier at a correct amount. With the tested filler grade and the specific tested filler amount, the optimized amount of 6-amino hexanoic acid was approx. 2.5 mmol of treatment agent per 100 m2 of CaCO3. These found improvements in a twin-screw extruded polyamide 12 compound show the possible usage of modified calcium carbonate as a functional filler in additive manufacturing and can potentially be transferred in a subsequent investigation in the selective laser sintering process.

scholarly journals Modeling crystallization kinetics for selective laser sintering of polyamide 12

2021 ◽  
Author(s):  
Dominic Soldner ◽  
Paul Steinmann ◽  
Julia Mergheim
Keyword(s):  
Crystallization Kinetics ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polyamide 12

Study in performance and morphology of polyamide 12 produced by selective laser sintering technology

2018 ◽  
Vol 24 (5) ◽  
pp. 813-820 ◽  
Author(s):  
Junjie Wu ◽  
Xiang Xu ◽  
Zhihao Zhao ◽  
Minjie Wang ◽  
Jie Zhang
Keyword(s):  
Selective Laser Sintering ◽  
Polarized Light ◽  
Chain Scission ◽  
High Energy ◽  
Laser Sintering ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Content Type ◽  
X Ray ◽  
Polyamide 12

Purpose The purpose of this paper is to investigate the effect of selective laser sintering (SLS) method on morphology and performance of polyamide 12. Design/methodology/approach Crystallization behavior is critical to the properties of semi-crystalline polymers. The crystallization condition of SLS process is much different from others. The morphology of polyamide 12 produced by SLS technology was investigated using scanning electron microscopy, polarized light microscopy, differential scanning calorimetry, X-ray diffraction and wide-angle X-ray diffraction. Findings Too low fill laser power brought about bad fusion of powders, while too high energy input resulted in bad performance due to chain scission of macromolecules. There were three types of crystal in the raw powder material, denoted as overgrowth crystal, ring-banded spherulite and normal spherulite. Originality/value In this work, SLS samples with different sintering parameters, as well as compression molding sample for the purpose of comparison, were made to study the morphology and crystal structure of sintered PA12 in detail.

scholarly journals Influence of the Origin of Polyamide 12 Powder on the Laser Sintering Process and Laser Sintered Parts

2017 ◽  
Vol 7 (5) ◽  
pp. 462 ◽  
Author(s):  
Manfred Schmid ◽  
Rob Kleijnen ◽  
Marc Vetterli ◽  
Konrad Wegener
Keyword(s):  
Laser Sintering ◽  
Sintering Process ◽  
Polyamide 12

Preparation, characterisation and processing of carbon fibre/polyamide-12 composites for selective laser sintering

2011 ◽  
Vol 71 (16) ◽  
pp. 1834-1841 ◽  
Author(s):  
Chunze Yan ◽  
Liang Hao ◽  
Lin Xu ◽  
Yusheng Shi
Keyword(s):  
Carbon Fibre ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polyamide 12

Pre-processing studies for selective laser sintering of glass beads-filled polyamide 12 composites

2014 ◽  
Vol 4 (1) ◽  
pp. 28 ◽  
Author(s):  
Alkhair A. Mousa ◽  
Duc T. Pham ◽  
Soe P. Shwe
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Glass Beads ◽  
Polyamide 12

Surface modification of carbon fibers and the selective laser sintering of modified carbon fiber/nylon 12 composite powder

2017 ◽  
Vol 116 ◽  
pp. 253-260 ◽  
Author(s):  
Wu Jing ◽  
Chen Hui ◽  
Wu Qiong ◽  
Liu Hongbo ◽  
Luo Zhanjun
Keyword(s):  
Surface Modification ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Composite Powder ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Nylon 12

scholarly journals Selective laser sintering of copper filled polyamide 12: Characterization of powder properties and process behavior

2018 ◽  
Vol 40 (5) ◽  
pp. 1801-1809 ◽  
Author(s):  
Lydia Lanzl ◽  
Katrin Wudy ◽  
Sandra Greiner ◽  
Dietmar Drummer
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polyamide 12 ◽  
Process Behavior ◽  
Powder Properties
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