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Role of single-source-precursor structure on microstructure and electromagnetic properties of CNTs-SiCN nanocomposites

Liu, Xingmin and Yu, Zhaoju and Chen, Lingqi and Xu, Binbin and Li, Shuang and Yin, Xiaowei and Riedel, Ralf (2017):
Role of single-source-precursor structure on microstructure and electromagnetic properties of CNTs-SiCN nanocomposites.
In: Journal of the American Ceramic Society, John Wiley & Sons Ltd., pp. 4649-4660, 100, (10), ISSN 00027820,
DOI: 10.1111/jace.15000,
[Online-Edition: https://doi.org/10.1111/jace.15000],
[Article]

Abstract

Novel single-source-precursors (SSPs), namely carbon nanotube modified poly (methylvinyl) silazane (CNTs-HTT 1800), were synthesized via amidation reaction of poly (methylvinyl) silazane (HTT 1800) with carboxylic acid functionalized carbon nanotubes (CNTs-COOH) at the assistance of ZnCl2 catalyst, which was confirmed by means of Fourier transform infrared spectra (FT IR) and transmission electron microscopy (TEM). Besides, the TEM results unambiguously show the homogeneous distribution of the CNTs in the matrix of SSPs while serious aggregation of the CNTs in the matrix of physically-blended-precursor. Crack-free monolithic silicon carbonitride modified by carbon nanotubes ceramic nanocomposites (CNTs-SiCN) were prepared through pyrolysis of the obtained SSP green bodies at 1000°C. Due to the strong influence of polymer structure on the microstructure of final ceramics, the SSP-derived CNTs-SiCN nanocomposites clearly show the homogeneous distribution of the CNTs in the SiCN matrix while the physically-blended-precursor derived CNTs-SiCN nanocomposites exhibit serious aggregation and entangling of the CNTs in the SiCN matrix. With the same CNT content in the feed, the SSP-derived CNTs-SiCN nanocomposites possess significant improvements of electromagnetic (EM) absorbing properties compared to those from physically-blended-precursors, due to the quality of the dispersion of CNTs in the ceramic matrices.

Item Type: Article
Erschienen: 2017
Creators: Liu, Xingmin and Yu, Zhaoju and Chen, Lingqi and Xu, Binbin and Li, Shuang and Yin, Xiaowei and Riedel, Ralf
Title: Role of single-source-precursor structure on microstructure and electromagnetic properties of CNTs-SiCN nanocomposites
Language: English
Abstract:

Novel single-source-precursors (SSPs), namely carbon nanotube modified poly (methylvinyl) silazane (CNTs-HTT 1800), were synthesized via amidation reaction of poly (methylvinyl) silazane (HTT 1800) with carboxylic acid functionalized carbon nanotubes (CNTs-COOH) at the assistance of ZnCl2 catalyst, which was confirmed by means of Fourier transform infrared spectra (FT IR) and transmission electron microscopy (TEM). Besides, the TEM results unambiguously show the homogeneous distribution of the CNTs in the matrix of SSPs while serious aggregation of the CNTs in the matrix of physically-blended-precursor. Crack-free monolithic silicon carbonitride modified by carbon nanotubes ceramic nanocomposites (CNTs-SiCN) were prepared through pyrolysis of the obtained SSP green bodies at 1000°C. Due to the strong influence of polymer structure on the microstructure of final ceramics, the SSP-derived CNTs-SiCN nanocomposites clearly show the homogeneous distribution of the CNTs in the SiCN matrix while the physically-blended-precursor derived CNTs-SiCN nanocomposites exhibit serious aggregation and entangling of the CNTs in the SiCN matrix. With the same CNT content in the feed, the SSP-derived CNTs-SiCN nanocomposites possess significant improvements of electromagnetic (EM) absorbing properties compared to those from physically-blended-precursors, due to the quality of the dispersion of CNTs in the ceramic matrices.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 100
Number: 10
Publisher: John Wiley & Sons Ltd.
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 11 Dec 2017 12:36
DOI: 10.1111/jace.15000
Official URL: https://doi.org/10.1111/jace.15000
Funders: Funded by Natural Science Foundation of China. Grant Number: 50802079, Funded by Natural Science Foundation of Fujian Province of China. Grant Number: 2015J01221, Funded by Creative Research Foundation of Science and Technology on Thermostructural Composite Materials Laboratory. Grant Number: 6142911040114, Funded by China Scholarship Council. Grant Number: 201406290019
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