scholarly journals 3D Printing of Mixed Matrix Films Based on Metal–Organic Frameworks and Thermoplastic Polyamide 12 by Selective Laser Sintering for Water Applications

2019 ◽  
Vol 11 (43) ◽  
pp. 40564-40574 ◽  
Author(s):  
Rui Li ◽  
Shangqin Yuan ◽  
Wang Zhang ◽  
Han Zheng ◽  
Wei Zhu ◽  
...  
Keyword(s):  
3D Printing ◽  
Selective Laser Sintering ◽  
Metal Organic Frameworks ◽  
Laser Sintering ◽  
Mixed Matrix ◽  
Polyamide 12 ◽  
Metal Organic

scholarly journals Selective Laser Sintering of Metal-Organic Frameworks: Production of Highly Porous Filters by 3D Printing onto a Polymeric Matrix

ChemPlusChem ◽  
2019 ◽  
Vol 84 (2) ◽  
pp. 222-225 ◽  
Author(s):  
Elmeri Lahtinen ◽  
Rafaella L. M. Precker ◽  
Manu Lahtinen ◽  
Evamarie Hey-Hawkins ◽  
Matti Haukka
Keyword(s):  
3D Printing ◽  
Selective Laser Sintering ◽  
Metal Organic Frameworks ◽  
Laser Sintering ◽  
Polymeric Matrix ◽  
Metal Organic ◽  
Highly Porous

Colorometric study of polyamide-12 powder aging

2020 ◽  
Vol 86 (10) ◽  
pp. 31-35
Author(s):  
N. Ya. Mokshina ◽  
V. V. Khripushin ◽  
M. S. Shcherbakova
Keyword(s):  
3D Printing ◽  
Selective Laser Sintering ◽  
Colorimetric Method ◽  
Critical Factor ◽  
Thermal Exposure ◽  
Practical Experience ◽  
Laser Sintering ◽  
Computer Processing ◽  
Polyamide 12 ◽  
Long Term Storage

The key point of 3D printing by selective laser sintering is the necessity of complete filling of the working chamber of the printer with a powder material. Since the powder is not completely consumed during the printing process, 25 – 30 wt.% of secondary (unused in the previous cycle) power is added to the primary material in each cycle. Repeated recirculation leads to degradation of the properties of the working powder mixture and increases the probability of rejects. We present the results of a colorimetric study of aging of polyamide-12 powder used in 3D printing by the method of selective laser sintering. Scanning and computer processing of digital images of primary and secondary polyamide powders obtained by colorimetry were performed using MathLab program package. Colorimetric analysis included the expression of the sample color using the parameters of color models applied in digital technologies for synthesizing colored images. The number of cycles before the onset of intensive destruction is no more than three, which is consistent with the practical experience in printing by selective laser sintering. The results characterizing change in the color of the secondary powder depending on the duration of thermal exposure and the gas medium are presented. It is shown that long-term storage of the powder for subsequent use is not advisable, since the initiators of destruction are already present in the material. Thermal oxidative destruction is shown to be a critical factor limiting the use of secondary powder along with changes in the crystallinity and fractional composition of particles. Computer processing of images of polymer powder obtained by the colorimetric method can be used to control the aging process of consumables and to predict the probability of rejections in 3D printing.

3D Printing of a Robust Polyamide‐12‐Carbon Black Composite via Selective Laser Sintering: Thermal and Electrical Conductivity

2019 ◽  
Vol 304 (4) ◽  
pp. 1800718 ◽  
Author(s):  
Alejandro H. Espera ◽  
Arnaldo D. Valino ◽  
Jerome O. Palaganas ◽  
Lucio Souza ◽  
Qiyi Chen ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
3D Printing ◽  
Carbon Black ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polyamide 12

Comparative study on 3D printing of polyamide 12 by selective laser sintering and multi jet fusion

2021 ◽  
Vol 288 ◽  
pp. 116882 ◽  
Author(s):  
Chao Cai ◽  
Wei Shian Tey ◽  
Jiayao Chen ◽  
Wei Zhu ◽  
Xingjian Liu ◽  
...  
Keyword(s):  
3D Printing ◽  
Comparative Study ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polyamide 12

Covalent adaptable networks of polydimethylsiloxane elastomer for selective laser sintering 3D printing

2021 ◽  
Vol 412 ◽  
pp. 128675
Author(s):  
Shaojie Sun ◽  
Guoxia Fei ◽  
Xiaorong Wang ◽  
Miao Xie ◽  
Quanfen Guo ◽  
...  
Keyword(s):  
3D Printing ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polydimethylsiloxane Elastomer

scholarly journals Fabrication of Porous Hydrogenation Catalysts by a Selective Laser Sintering 3D Printing Technique

ACS Omega ◽  
2019 ◽  
Vol 4 (7) ◽  
pp. 12012-12017 ◽  
Author(s):  
Elmeri Lahtinen ◽  
Lotta Turunen ◽  
Mikko M. Hänninen ◽  
Kalle Kolari ◽  
Heikki M. Tuononen ◽  
...  
Keyword(s):  
3D Printing ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Hydrogenation Catalysts ◽  
Printing Technique ◽  
3D Printing Technique

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.

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