Influence of anionic surface modifiers on the thermal stability and mechanical properties of layered double hydroxide/polypropylene nanocomposites

Yang, Jae-Hun, Zhang, Wei, Ryu, Hyunju, Lee, Ji-Hee, Park, Dae-Hwan, Choi, J.Yoon, Vinu, Ajayan, Elzatahry, Ahmed A. and Choy, Jin-Ho (2015) Influence of anionic surface modifiers on the thermal stability and mechanical properties of layered double hydroxide/polypropylene nanocomposites. Journal of Materials Chemistry A, 3 45: 22730-22738. doi:10.1039/c5ta06271c


Author Yang, Jae-Hun
Zhang, Wei
Ryu, Hyunju
Lee, Ji-Hee
Park, Dae-Hwan
Choi, J.Yoon
Vinu, Ajayan
Elzatahry, Ahmed A.
Choy, Jin-Ho
Title Influence of anionic surface modifiers on the thermal stability and mechanical properties of layered double hydroxide/polypropylene nanocomposites
Journal name Journal of Materials Chemistry A   Check publisher's open access policy
ISSN 2050-7488
2050-7496
Publication date 2015-01-01
Year available 2015
Sub-type Article (original research)
DOI 10.1039/c5ta06271c
Open Access Status Not Open Access
Volume 3
Issue 45
Start page 22730
End page 22738
Total pages 9
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Subject 1600 Chemistry
2105 Renewable Energy, Sustainability and the Environment
2500 Materials Science
Abstract Organo-layered double hydroxide/polypropylene (LDH/PP) nanocomposites were successfully synthesized via a solution blending method. As an attempt to improve the compatibility with hydrophobic PP, the LDH surface was modified by the incorporation of various anionic surfactants via electrostatic interaction with LDH cationic layers. Surfactants were selected by considering the aliphatic carbon chain length (laurate, palmitate, stearate and dodecyl sulfate) and anionic functional groups (-COO, -OPO, and -OSO) with the purpose of optimizing the homogeneous dispersion in the PP matrix. In PP nanocomposites containing LDH modified with alkyl carboxylate, the (00l) X-ray diffraction (XRD) peaks originating from organo-LDH were not observed, indicating that organo-LDH layers were fully exfoliated and homogeneously dispersed within the PP matrix, which were also confirmed by cross-sectional TEM analysis. However, PP nanocomposites containing LDH modified with dodecyl sulfate and lauryl phosphate showed broad (00l) XRD peaks, indicating that organo-LDH was partially exfoliated. According to the thermogravimetric analysis, the thermal stability (T) of organo-LDH/PP nanocomposites was significantly improved by 37-60 K, depending on the type and loading content of organo-LDH compared to that of pristine PP. PP nanocomposites containing well-dispersed organo-LDH showed substantial enhancement of the elastic modulus with little decrease of tensile strength. These results are due to the increased interface volume fraction provided by the exfoliated LDH nanosheets.
Formatted abstract
Organo-layered double hydroxide/polypropylene (LDH/PP) nanocomposites were successfully synthesized via a solution blending method. As an attempt to improve the compatibility with hydrophobic PP, the LDH surface was modified by the incorporation of various anionic surfactants via electrostatic interaction with LDH cationic layers. Surfactants were selected by considering the aliphatic carbon chain length (laurate, palmitate, stearate and dodecyl sulfate) and anionic functional groups (–COO−, –OPO32−, and –OSO3−) with the purpose of optimizing the homogeneous dispersion in the PP matrix. In PP nanocomposites containing LDH modified with alkyl carboxylate, the (00l) X-ray diffraction (XRD) peaks originating from organo-LDH were not observed, indicating that organo-LDH layers were fully exfoliated and homogeneously dispersed within the PP matrix, which were also confirmed by cross-sectional TEM analysis. However, PP nanocomposites containing LDH modified with dodecyl sulfate and lauryl phosphate showed broad (00l) XRD peaks, indicating that organo-LDH was partially exfoliated. According to the thermogravimetric analysis, the thermal stability (T0.5) of organo-LDH/PP nanocomposites was significantly improved by 37–60 K, depending on the type and loading content of organo-LDH compared to that of pristine PP. PP nanocomposites containing well-dispersed organo-LDH showed substantial enhancement of the elastic modulus with little decrease of tensile strength. These results are due to the increased interface volume fraction provided by the exfoliated LDH nanosheets.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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