NDLI: Carboxylated Carbon Nanotube/Polyimide Films with Low Thermal Expansion Coefficient and Excellent Mechanical Properties.

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Carboxylated Carbon Nanotube/Polyimide Films with Low Thermal Expansion Coefficient and Excellent Mechanical Properties.

Content Provider	Europe PMC
Author	Lu, Cheng Lin, Fangbing Shao, Huiqi Bi, Siyi Chen, Nanliang Shao, Guangwei Jiang, Jinhua
Editor	Valentini, Luca
Copyright Year	2022
Abstract	Polyimide (PI) films with excellent heat resistance and outstanding mechanical properties have been widely researched in microelectronics and aerospace fields. However, most PI films can only be used under ordinary conditions due to their instability of dimension. The fabrication of multifunctional PI films for harsh conditions is still a challenge. Herein, flexible, low coefficient of thermal expansion (CTE) and improved mechanical properties films modified by carboxylated carbon nanotube (C-CNT) were fabricated. Acid treatment was adapted to adjust the surface characteristics by using a mixture of concentrated H2SO4/HNO3 solution to introduce carboxyl groups on the surface and improve the interfacial performance between the CNT and matrix. Moreover, different C-CNT concentrations of 0, 1, 3, 5, 7, and 9 wt.% were synthesized to use for the PI film fabrication. The results demonstrated that the 9 wt.% and 5 wt.% C-CNT/PI films possessed the lowest CTE value and the highest mechanical properties. In addition, the thermal stability of the C-CNT/PI films was improved, making them promising applications in precise and harsh environments.
Journal	Polymers
Volume Number	14
PubMed Central reference number	PMC9654399
Issue Number	21
PubMed reference number	36365560
e-ISSN	20734360
DOI	10.3390/polym14214565
Language	English
Publisher	MDPI
Publisher Date	2022-10-27
Access Restriction	Open
Rights License	Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). © 2022 by the authors.
Subject Keyword	multiwalled carbon nanotubes acid treatment polyimide film physical-chemical properties
Content Type	Text
Resource Type	Article
Subject	Chemistry Polymers and Plastics

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