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Influence of Noncovalent Modification on Dispersion State of Multiwalled Carbon Nanotubes in Melt-Mixed Immiscible Polymer Blends

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Title Influence of Noncovalent Modification on Dispersion State of Multiwalled Carbon Nanotubes in Melt-Mixed Immiscible Polymer Blends
 
Creator POYEKAR, AV
BHATTACHARYYA, AR
PANWAR, AS
SIMON, GP
SUTAR, DS
 
Subject MWNTs
DC electrical conductivity
polymer blends
phase morphology
organic modifiers
interphase
ELECTRICAL-CONDUCTIVITY
MECHANICAL-PROPERTIES
NANOTUBE/POLYMER COMPOSITES
FILLED POLYCARBONATE
MORPHOLOGY
NANOCOMPOSITES
LOCALIZATION
POLYETHYLENE
RESISTIVITY
NANOPARTICLES
 
Description Multiwalled carbon nanotubes (MWNTs) were melt-mixed with polyamide6 (PA6) and acrylonitrile butadiene styrene copolymer (ABS) to obtain electrically conducting composites. MWNTs were noncovalently modified with sodium salt of 6-aminocaproic acid (MWNTs-ml) and 3-pyrenealdehyde (MWNTs-m2) to `deagglomerate' MVVNTs. Raman spectroscopic analysis indicated a G-band shift from similar to 1581.9 cm(-1) for pristine MVVNTs to,similar to 1590.2 cm(-1) for MWNTs-ml and similar to 1588.8 cm(-1) for MWNTs-m2, indicating the interaction between MVVNTs and the respective modifier molecules. Blends showed 'co-continuous' morphology on the addition of MWNTs. TEM observations showed that a higher population of pristine MWNTs exhibited a 'nanoagglomerated' state in PA6 and ABS phases in the case of a 40/60 PA6/ABS blend, unlike a 60/40 blend, which depicted a higher population of 'individualized' MWNTs. Further, the corresponding blends with MWNTs-ml and MWNTs-m2 showed 'nanoagglomerated' and 'individualized' MWNTs. Blends with pristine MWNTs showed an increase in DC electrical conductivity with an increase in PA6 concentration in the blend. Moreover, the corresponding blends with MWNTs-ml and MWNTs-m2 exhibited an increased DC electrical conductivity value as compared to the corresponding blend with pristine MWNTs. Ratio of the intensity (H-1/H-2) of the crystallization peak at lower temperature (H-1 to the intensity of the crystallization peak at higher temperature (H-2) depicted lower values for blends with pristine MVVNTs as compared to the corresponding blends with MWNTs-ml and MWNTs-m2. TGA studies indicated the formation of a thicker 'interphase' involving MWNTs and the interacting polymer chains.
 
Publisher AMER CHEMICAL SOC
 
Date 2014-12-29T05:32:10Z
2014-12-29T05:32:10Z
2014
 
Type Article
 
Identifier ACS APPLIED MATERIALS & INTERFACES, 6(14)11054-11067
1944-8244
http://dx.doi.org/10.1021/am501737z
http://dspace.library.iitb.ac.in/jspui/handle/100/17201
 
Language English