Partial exfoliation of layered double hydroxides in DMSO: a route to transparent polymer nanocomposites

Layered double hydroxides (LDHs), either having nitrate counter anions or intercalated with organic molecules, have been for the first time partially exfoliated in dimethyl sulfoxide (DMSO) to form a transparent suspension. Atomic force microscopy (AFM) images showed that both the lateral size and t...

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Published in:Journal of materials chemistry 2011-01, Vol.21 (13), p.4869-4874
Main Authors: Zhao, Yan, Yang, Weidong, Xue, Yuhua, Wang, Xungai, Lin, Tong
Format: Article
Language:English
Subjects:
Anions
Atomic force microscopy
Exfoliation
Hydroxides
Nanocomposites
Nanostructure
Thermal stability
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description Layered double hydroxides (LDHs), either having nitrate counter anions or intercalated with organic molecules, have been for the first time partially exfoliated in dimethyl sulfoxide (DMSO) to form a transparent suspension. Atomic force microscopy (AFM) images showed that both the lateral size and the thickness of the LDH nanoplatelets were decreased after the exfoliation. The organic-LDHs maintained their intercalation characteristics, i.e. the thermal stability improvement of the incorporated organic anions, after the exfoliation in DMSO. Transparent ethylene-vinyl alcohol copolymer (EVOH) nanocomposite films containing partially exfoliated LDHs intercalated with UV absorbers were prepared using DMSO as the processing solvent. As the first reported example of a highly transparent LDH/polymer composite, the obtained composite film had a visible light transmittance of 90% (comparable to that of the pure matrix), was flexible and exhibited an excellent UV-shielding capability and thermal stability.
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subjects Anions
Atomic force microscopy
Exfoliation
Hydroxides
Nanocomposites
Nanostructure
Thermal stability
title Partial exfoliation of layered double hydroxides in DMSO: a route to transparent polymer nanocomposites
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