Preparation and properties of polyimide/multi⁃walled carbon nanotubes composite foams

doi:10.19491/j.issn.1001-9278.2022.06.007

Abstract

Abstract:

Polyimide/multi?walled carbon nanotubes （MWCNT） composite foams were prepared through in?situ polymerization of polyimide with different mass fractions of MWCNT， and their morphology and properties were investigated using scanning electron microscopy and thermogravimetry. The results indicated that the cell diameter of the composite foams increased with an increase in the mass fraction of MWCNT， but their foam density decreased. There was an agglomeration occurring when the MWCNT content exceeded 0.4 wt%. This limited the formation of the foam structure and led to foaming an irregular shape. The composite foams obtained an optimal enhancement effect on compressive strength， compressive modulus， and hardness when 0.2 wt% MWCNT was incorporated. The enhancement effect was found to increase at first and then tended to decrease with an increase in the mass fraction of MWCNT. The composite foams achieved a maximum thermal stability when 0.05 wt% MWCNT was added.

Key words: polyimide, multi?walled carbon nanotube, foam material, mechanical property

CLC Number:

TQ323.6

WANG Shuai, ZHANG Yudi, YANG Fukai, XU Xinyu. Preparation and properties of polyimide/multi⁃walled carbon nanotubes composite foams[J]. China Plastics, 2022, 36(6): 39-45.

Figures/Tables 8

References 21

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样品	用量/g
PMDA	20.0
PAPI	20.0
TEA	0.6
T9	0.4
CH₃OH	2.4
H₂O	2.8
PEG⁃600	15.0
AK8805	5.0
DMF	20.0
MWCNT	0.05 %~0.6 %

样品	用量/g
PMDA	20.0
PAPI	20.0
TEA	0.6
T9	0.4
CH₃OH	2.4
H₂O	2.8
PEG⁃600	15.0
AK8805	5.0
DMF	20.0
MWCNT	0.05 %~0.6 %

样品	压缩模量/MPa	发生15 %应变时压缩强度/MPa	质量保留率/ %	5 %失重温度（T_{5 %}）/℃
纯PI	2.52	0.032	33.65	302.0
PI/MWCNT⁃1	4.63	0.071	45.24	321.5
PI/MWCNT⁃2	5.10	0.080	42.44	318.0
PI/MWCNT⁃3	5.39	0.107	41.67	315.6
PI/MWCNT⁃4	4.92	0.068	40.86	312.9
PI/MWCNT⁃5	4.86	0.058	38.80	308.2

样品	压缩模量/MPa	发生15 %应变时压缩强度/MPa	质量保留率/ %	5 %失重温度（T_{5 %}）/℃
纯PI	2.52	0.032	33.65	302.0
PI/MWCNT⁃1	4.63	0.071	45.24	321.5
PI/MWCNT⁃2	5.10	0.080	42.44	318.0
PI/MWCNT⁃3	5.39	0.107	41.67	315.6
PI/MWCNT⁃4	4.92	0.068	40.86	312.9
PI/MWCNT⁃5	4.86	0.058	38.80	308.2

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