Laser sintering of graphene nanoplatelets encapsulated polyamide powders

Binling Chen; Richard Davies; Yaan Liu; Nan Yi; Dayuan Qiang; Yanqiu Zhu; Oana Ghita

doi:10.1016/j.addma.2020.101363

Laser sintering of graphene nanoplatelets encapsulated polyamide powders

Binling Chen^*, Richard Davies, Yaan Liu, Nan Yi, Dayuan Qiang, Yanqiu Zhu, Oana Ghita

^*Corresponding author for this work

University of Exeter

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

This paper presents a comprehensive study in the fabrication and safety of new nanocomposite powders for laser sintering. The nanocomposite powder is based on a core-shell structure where nanoparticles (graphene nanoplatelets, GNP) are encapsulated on the surface of the polymeric particles (polyamides PA12) in a thin layer of poly(vinyl alcohol) (PVA). Powder rheology data as well as SEM and TEM showed that GNP were dispersed well in the PVA coating and improved flow. Half time crystallisation kinetics was used to determine differences induced in the polymer and the laser sintering process by the presence of GNP. Nanosafety aspects, critical in a manufacturing environment, are also considered here and exposure monitoring tests were carried out. Results confirmed a low nanoparticle air exposure and therefore confirmed the successful surface encapsulation of the GNP in nanocomposite powders. The laser-sintered 0.1GNP/PVA-PA12 parts showed enhanced mechanical properties in tensile, compression and 3-point bending test.

Original language	English
Article number	101363
Journal	Additive Manufacturing
Volume	35
DOIs	https://doi.org/10.1016/j.addma.2020.101363
Publication status	Published - Oct 2020
Externally published	Yes

Keywords

Core-shell structure
Laser sintering
Nanocomposites powders
Nanosafety
Powder bed fusion

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10.1016/j.addma.2020.101363

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Chen, B., Davies, R., Liu, Y., Yi, N., Qiang, D., Zhu, Y., & Ghita, O. (2020). Laser sintering of graphene nanoplatelets encapsulated polyamide powders. Additive Manufacturing, 35, Article 101363. https://doi.org/10.1016/j.addma.2020.101363

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title = "Laser sintering of graphene nanoplatelets encapsulated polyamide powders",

abstract = "This paper presents a comprehensive study in the fabrication and safety of new nanocomposite powders for laser sintering. The nanocomposite powder is based on a core-shell structure where nanoparticles (graphene nanoplatelets, GNP) are encapsulated on the surface of the polymeric particles (polyamides PA12) in a thin layer of poly(vinyl alcohol) (PVA). Powder rheology data as well as SEM and TEM showed that GNP were dispersed well in the PVA coating and improved flow. Half time crystallisation kinetics was used to determine differences induced in the polymer and the laser sintering process by the presence of GNP. Nanosafety aspects, critical in a manufacturing environment, are also considered here and exposure monitoring tests were carried out. Results confirmed a low nanoparticle air exposure and therefore confirmed the successful surface encapsulation of the GNP in nanocomposite powders. The laser-sintered 0.1GNP/PVA-PA12 parts showed enhanced mechanical properties in tensile, compression and 3-point bending test.",

keywords = "Core-shell structure, Laser sintering, Nanocomposites powders, Nanosafety, Powder bed fusion",

author = "Binling Chen and Richard Davies and Yaan Liu and Nan Yi and Dayuan Qiang and Yanqiu Zhu and Oana Ghita",

note = "Publisher Copyright: {\textcopyright} 2020 The Author(s)",

year = "2020",

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doi = "10.1016/j.addma.2020.101363",

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AU - Chen, Binling

AU - Davies, Richard

AU - Liu, Yaan

AU - Yi, Nan

AU - Qiang, Dayuan

AU - Zhu, Yanqiu

AU - Ghita, Oana

PY - 2020/10

Y1 - 2020/10

N2 - This paper presents a comprehensive study in the fabrication and safety of new nanocomposite powders for laser sintering. The nanocomposite powder is based on a core-shell structure where nanoparticles (graphene nanoplatelets, GNP) are encapsulated on the surface of the polymeric particles (polyamides PA12) in a thin layer of poly(vinyl alcohol) (PVA). Powder rheology data as well as SEM and TEM showed that GNP were dispersed well in the PVA coating and improved flow. Half time crystallisation kinetics was used to determine differences induced in the polymer and the laser sintering process by the presence of GNP. Nanosafety aspects, critical in a manufacturing environment, are also considered here and exposure monitoring tests were carried out. Results confirmed a low nanoparticle air exposure and therefore confirmed the successful surface encapsulation of the GNP in nanocomposite powders. The laser-sintered 0.1GNP/PVA-PA12 parts showed enhanced mechanical properties in tensile, compression and 3-point bending test.

AB - This paper presents a comprehensive study in the fabrication and safety of new nanocomposite powders for laser sintering. The nanocomposite powder is based on a core-shell structure where nanoparticles (graphene nanoplatelets, GNP) are encapsulated on the surface of the polymeric particles (polyamides PA12) in a thin layer of poly(vinyl alcohol) (PVA). Powder rheology data as well as SEM and TEM showed that GNP were dispersed well in the PVA coating and improved flow. Half time crystallisation kinetics was used to determine differences induced in the polymer and the laser sintering process by the presence of GNP. Nanosafety aspects, critical in a manufacturing environment, are also considered here and exposure monitoring tests were carried out. Results confirmed a low nanoparticle air exposure and therefore confirmed the successful surface encapsulation of the GNP in nanocomposite powders. The laser-sintered 0.1GNP/PVA-PA12 parts showed enhanced mechanical properties in tensile, compression and 3-point bending test.

KW - Core-shell structure

KW - Laser sintering

KW - Nanocomposites powders

KW - Nanosafety

KW - Powder bed fusion

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VL - 35

JO - Additive Manufacturing

JF - Additive Manufacturing

M1 - 101363

ER -

Laser sintering of graphene nanoplatelets encapsulated polyamide powders

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Keywords

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