Mechanical and EMI shielding properties of solid and microcellular TPU/nanographite composite membranes

Tough, flexible, and conductive polymer composites show numerous advantages over conventional metal-based materials for EMI shielding applications, for example, in enclosures and packages of electronic devices, due to their low density, high flexibility, excellent corrosion resistance, and easy proc...

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Autores principales:	Xinyang Li, Guilong Wang, Chunxia Yang, Jinchuan Zhao, Aimin Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Thermoplastic polyurethane Graphite Composite Microcellular foaming EMI shielding Polymers and polymer manufacture TP1080-1185
Acceso en línea:	https://doaj.org/article/6b9ef88937324199acdc3d60ca9364f3
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spelling	oai:doaj.org-article:6b9ef88937324199acdc3d60ca9364f32021-11-24T04:23:54ZMechanical and EMI shielding properties of solid and microcellular TPU/nanographite composite membranes0142-941810.1016/j.polymertesting.2020.106891https://doaj.org/article/6b9ef88937324199acdc3d60ca9364f32021-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0142941820321206https://doaj.org/toc/0142-9418Tough, flexible, and conductive polymer composites show numerous advantages over conventional metal-based materials for EMI shielding applications, for example, in enclosures and packages of electronic devices, due to their low density, high flexibility, excellent corrosion resistance, and easy processing. Herein, thermoplastic polyurethane (TPU) was compounded with flake-shaped nanographite to prepare flexible polymer composite membranes with enhanced mechanical and EMI shielding properties. To regulate TPU/graphite composite's properties, microcellular foaming with carbon dioxide was used to prepare microcellular TPU/graphite composite membranes. Nanographite can significantly promote cell nucleation and hence lead to a refined cellular structure. With 20 wt% nanographite, cell density can be increased by two orders of magnitude. By adding the optimal amount of nanographite, the tensile strength and modulus can be increased up to 28% and 39%, compared to TPU. Although microcellular foaming compromises the tensile properties of the composites, it can significantly enhance their elasticity with more than a 20% decrease in hysteresis loss in comparison to solid ones. Moreover, it is also found that TPU composites with high graphite contents significantly enhanced EMI shielding properties, and microcellular foaming leads to relatively worse EMI shielding performance. Both solid and foamed TPU/graphite composites show promising prospects in EMI shielding applications.Xinyang LiGuilong WangChunxia YangJinchuan ZhaoAimin ZhangElsevierarticleThermoplastic polyurethaneGraphiteCompositeMicrocellular foamingEMI shieldingPolymers and polymer manufactureTP1080-1185ENPolymer Testing, Vol 93, Iss , Pp 106891- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Thermoplastic polyurethane Graphite Composite Microcellular foaming EMI shielding Polymers and polymer manufacture TP1080-1185
spellingShingle	Thermoplastic polyurethane Graphite Composite Microcellular foaming EMI shielding Polymers and polymer manufacture TP1080-1185 Xinyang Li Guilong Wang Chunxia Yang Jinchuan Zhao Aimin Zhang Mechanical and EMI shielding properties of solid and microcellular TPU/nanographite composite membranes
description	Tough, flexible, and conductive polymer composites show numerous advantages over conventional metal-based materials for EMI shielding applications, for example, in enclosures and packages of electronic devices, due to their low density, high flexibility, excellent corrosion resistance, and easy processing. Herein, thermoplastic polyurethane (TPU) was compounded with flake-shaped nanographite to prepare flexible polymer composite membranes with enhanced mechanical and EMI shielding properties. To regulate TPU/graphite composite's properties, microcellular foaming with carbon dioxide was used to prepare microcellular TPU/graphite composite membranes. Nanographite can significantly promote cell nucleation and hence lead to a refined cellular structure. With 20 wt% nanographite, cell density can be increased by two orders of magnitude. By adding the optimal amount of nanographite, the tensile strength and modulus can be increased up to 28% and 39%, compared to TPU. Although microcellular foaming compromises the tensile properties of the composites, it can significantly enhance their elasticity with more than a 20% decrease in hysteresis loss in comparison to solid ones. Moreover, it is also found that TPU composites with high graphite contents significantly enhanced EMI shielding properties, and microcellular foaming leads to relatively worse EMI shielding performance. Both solid and foamed TPU/graphite composites show promising prospects in EMI shielding applications.
format	article
author	Xinyang Li Guilong Wang Chunxia Yang Jinchuan Zhao Aimin Zhang
author_facet	Xinyang Li Guilong Wang Chunxia Yang Jinchuan Zhao Aimin Zhang
author_sort	Xinyang Li
title	Mechanical and EMI shielding properties of solid and microcellular TPU/nanographite composite membranes
title_short	Mechanical and EMI shielding properties of solid and microcellular TPU/nanographite composite membranes
title_full	Mechanical and EMI shielding properties of solid and microcellular TPU/nanographite composite membranes
title_fullStr	Mechanical and EMI shielding properties of solid and microcellular TPU/nanographite composite membranes
title_full_unstemmed	Mechanical and EMI shielding properties of solid and microcellular TPU/nanographite composite membranes
title_sort	mechanical and emi shielding properties of solid and microcellular tpu/nanographite composite membranes
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/6b9ef88937324199acdc3d60ca9364f3
work_keys_str_mv	AT xinyangli mechanicalandemishieldingpropertiesofsolidandmicrocellulartpunanographitecompositemembranes AT guilongwang mechanicalandemishieldingpropertiesofsolidandmicrocellulartpunanographitecompositemembranes AT chunxiayang mechanicalandemishieldingpropertiesofsolidandmicrocellulartpunanographitecompositemembranes AT jinchuanzhao mechanicalandemishieldingpropertiesofsolidandmicrocellulartpunanographitecompositemembranes AT aiminzhang mechanicalandemishieldingpropertiesofsolidandmicrocellulartpunanographitecompositemembranes
_version_	1718416038260899840

Mechanical and EMI shielding properties of solid and microcellular TPU/nanographite composite membranes

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