Mechanical and thermal expansion properties of aligned carbon nanotube reinforced epoxy composites

Aligned MWCNT/epoxy composites made with the three types of the multi-walled carbon nanotubes (MWCNTs) with different thermal annealing temperature have been prepared, and the tensile tests and thermal expansion tests of the composites in the MWCNT alignment direction were conducted to evaluate the...

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Autores principales:	Keiichi SHIRASU, Itaru TAMAKI, Go YAMAMOTO, Toshiyuki HASHIDA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2019
Materias:	carbon nanotubes polymer materials composites coefficient of thermal expansion crystallinity Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/dee08f5d2c11421c976ed352da80a5b9
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spelling	oai:doaj.org-article:dee08f5d2c11421c976ed352da80a5b92021-11-29T05:43:34ZMechanical and thermal expansion properties of aligned carbon nanotube reinforced epoxy composites2187-974510.1299/mej.19-00012https://doaj.org/article/dee08f5d2c11421c976ed352da80a5b92019-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/6/3/6_19-00012/_pdf/-char/enhttps://doaj.org/toc/2187-9745Aligned MWCNT/epoxy composites made with the three types of the multi-walled carbon nanotubes (MWCNTs) with different thermal annealing temperature have been prepared, and the tensile tests and thermal expansion tests of the composites in the MWCNT alignment direction were conducted to evaluate the effects of crystallinity of MWCNTs on the mechanical and thermal expansion properties of aligned MWCNT reinforced epoxy composites. Additionally, the coefficients of thermal expansion (CTEs) of the MWCNTs in the axial direction were computed by using the Young's modulus of the MWCNTs and the CTE of the composites in Turner's model. The annealing temperatures of the MWCNTs were 2400°C and 2900°C. It was shown that the thermal annealing of MWCNTs was effective for improving the crystallinity of the MWCNTs, while it had no major effects on both tensile strength and Young's modulus of the composites. This is mainly because the thermally annealed MWCNTs themselves possessed almost comparable nominal tensile strength (~4-5 GPa) and Young's modulus (~200 GPa) compared with the as-grown MWCNTs. On the other hand, we demonstrated by thermal expansion testing that the thermal contraction of the composites in the nanotube alignment direction was observed by the addition of MWCNTs. All the MWCNTs possessed negative CTEs and the CTEs tend to become more negative with increasing annealing temperature. This is probably because of a decrease in the number of small defects (vacancies and Stone-Wales defects) and intershell cross-linking defects associated with sp3 carbons, and an increase in the sp2 carbons owing to the high-temperature thermal annealing.Keiichi SHIRASUItaru TAMAKIGo YAMAMOTOToshiyuki HASHIDAThe Japan Society of Mechanical Engineersarticlecarbon nanotubespolymer materialscompositescoefficient of thermal expansioncrystallinityMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 6, Iss 3, Pp 19-00012-19-00012 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	carbon nanotubes polymer materials composites coefficient of thermal expansion crystallinity Mechanical engineering and machinery TJ1-1570
spellingShingle	carbon nanotubes polymer materials composites coefficient of thermal expansion crystallinity Mechanical engineering and machinery TJ1-1570 Keiichi SHIRASU Itaru TAMAKI Go YAMAMOTO Toshiyuki HASHIDA Mechanical and thermal expansion properties of aligned carbon nanotube reinforced epoxy composites
description	Aligned MWCNT/epoxy composites made with the three types of the multi-walled carbon nanotubes (MWCNTs) with different thermal annealing temperature have been prepared, and the tensile tests and thermal expansion tests of the composites in the MWCNT alignment direction were conducted to evaluate the effects of crystallinity of MWCNTs on the mechanical and thermal expansion properties of aligned MWCNT reinforced epoxy composites. Additionally, the coefficients of thermal expansion (CTEs) of the MWCNTs in the axial direction were computed by using the Young's modulus of the MWCNTs and the CTE of the composites in Turner's model. The annealing temperatures of the MWCNTs were 2400°C and 2900°C. It was shown that the thermal annealing of MWCNTs was effective for improving the crystallinity of the MWCNTs, while it had no major effects on both tensile strength and Young's modulus of the composites. This is mainly because the thermally annealed MWCNTs themselves possessed almost comparable nominal tensile strength (~4-5 GPa) and Young's modulus (~200 GPa) compared with the as-grown MWCNTs. On the other hand, we demonstrated by thermal expansion testing that the thermal contraction of the composites in the nanotube alignment direction was observed by the addition of MWCNTs. All the MWCNTs possessed negative CTEs and the CTEs tend to become more negative with increasing annealing temperature. This is probably because of a decrease in the number of small defects (vacancies and Stone-Wales defects) and intershell cross-linking defects associated with sp3 carbons, and an increase in the sp2 carbons owing to the high-temperature thermal annealing.
format	article
author	Keiichi SHIRASU Itaru TAMAKI Go YAMAMOTO Toshiyuki HASHIDA
author_facet	Keiichi SHIRASU Itaru TAMAKI Go YAMAMOTO Toshiyuki HASHIDA
author_sort	Keiichi SHIRASU
title	Mechanical and thermal expansion properties of aligned carbon nanotube reinforced epoxy composites
title_short	Mechanical and thermal expansion properties of aligned carbon nanotube reinforced epoxy composites
title_full	Mechanical and thermal expansion properties of aligned carbon nanotube reinforced epoxy composites
title_fullStr	Mechanical and thermal expansion properties of aligned carbon nanotube reinforced epoxy composites
title_full_unstemmed	Mechanical and thermal expansion properties of aligned carbon nanotube reinforced epoxy composites
title_sort	mechanical and thermal expansion properties of aligned carbon nanotube reinforced epoxy composites
publisher	The Japan Society of Mechanical Engineers
publishDate	2019
url	https://doaj.org/article/dee08f5d2c11421c976ed352da80a5b9
work_keys_str_mv	AT keiichishirasu mechanicalandthermalexpansionpropertiesofalignedcarbonnanotubereinforcedepoxycomposites AT itarutamaki mechanicalandthermalexpansionpropertiesofalignedcarbonnanotubereinforcedepoxycomposites AT goyamamoto mechanicalandthermalexpansionpropertiesofalignedcarbonnanotubereinforcedepoxycomposites AT toshiyukihashida mechanicalandthermalexpansionpropertiesofalignedcarbonnanotubereinforcedepoxycomposites
_version_	1718407678380736512

Mechanical and thermal expansion properties of aligned carbon nanotube reinforced epoxy composites

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