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Title: Polymer Nanocomposites Based on Transition Metal Ion Modified Organoclays

Abstract

A unique class of nanocomposites containing organoclays modified with catalytically active transition metal ions (TMI) and ethylene vinyl acetate (EVA) copolymers was prepared. The morphology, thermal and rheological properties of these nanocomposites were studied by thermal gravimetric analysis (TGA), transmission electron microscopy (TEM), extended X-ray absorption fine structure (EXAFS) spectroscopy, X-ray scattering/diffraction and oscillatory shear rheometry. TMI-modified organoclays were thought to possess pillaring of multivalent TMI in the interlayer silicate gallery, leading to a notable reduction of the interlayer d-spacing. The resulting nanocomposites exhibited significantly improved thermal stability and fire retardation properties, but similar morphology (i.e., an intercalated-exfoliated structure) and rheological properties comparable with EVA nanocomposites containing unmodified organoclays. It appears that the compressed organic component in the TMI-modified organoclay can still facilitate the intercalation/exfoliation processes of polymer molecules, especially under extensive shearing conditions. The improved fire retardation in nanocomposites with TMI-modified organoclays can be attributed to enhanced carbonaceous char formation during combustion, i.e., charring promoted by the presence of catalytically active TMI.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
930294
Report Number(s):
BNL-80998-2008-JA
Journal ID: ISSN 0032-3861; POLMAG; TRN: US200822%%1247
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Polymer; Journal Volume: 48; Journal Issue: 3
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; COPOLYMERS; CLAYS; COMPOSITE MATERIALS; NANOSTRUCTURES; TRANSITION ELEMENT COMPOUNDS; MORPHOLOGY; RHEOLOGY; FIRE RESISTANCE; national synchrotron light source

Citation Formats

Nawani,P., Desai, P., Lundwall, M., Gelfer, M., Hsiao, B., Rafailovich, M., Frenkel, A., Tsou, A., Gilman, J., and Khalid, S. Polymer Nanocomposites Based on Transition Metal Ion Modified Organoclays. United States: N. p., 2007. Web. doi:10.1016/j.polymer.2006.12.005.
Nawani,P., Desai, P., Lundwall, M., Gelfer, M., Hsiao, B., Rafailovich, M., Frenkel, A., Tsou, A., Gilman, J., & Khalid, S. Polymer Nanocomposites Based on Transition Metal Ion Modified Organoclays. United States. doi:10.1016/j.polymer.2006.12.005.
Nawani,P., Desai, P., Lundwall, M., Gelfer, M., Hsiao, B., Rafailovich, M., Frenkel, A., Tsou, A., Gilman, J., and Khalid, S. Mon . "Polymer Nanocomposites Based on Transition Metal Ion Modified Organoclays". United States. doi:10.1016/j.polymer.2006.12.005.
@article{osti_930294,
title = {Polymer Nanocomposites Based on Transition Metal Ion Modified Organoclays},
author = {Nawani,P. and Desai, P. and Lundwall, M. and Gelfer, M. and Hsiao, B. and Rafailovich, M. and Frenkel, A. and Tsou, A. and Gilman, J. and Khalid, S.},
abstractNote = {A unique class of nanocomposites containing organoclays modified with catalytically active transition metal ions (TMI) and ethylene vinyl acetate (EVA) copolymers was prepared. The morphology, thermal and rheological properties of these nanocomposites were studied by thermal gravimetric analysis (TGA), transmission electron microscopy (TEM), extended X-ray absorption fine structure (EXAFS) spectroscopy, X-ray scattering/diffraction and oscillatory shear rheometry. TMI-modified organoclays were thought to possess pillaring of multivalent TMI in the interlayer silicate gallery, leading to a notable reduction of the interlayer d-spacing. The resulting nanocomposites exhibited significantly improved thermal stability and fire retardation properties, but similar morphology (i.e., an intercalated-exfoliated structure) and rheological properties comparable with EVA nanocomposites containing unmodified organoclays. It appears that the compressed organic component in the TMI-modified organoclay can still facilitate the intercalation/exfoliation processes of polymer molecules, especially under extensive shearing conditions. The improved fire retardation in nanocomposites with TMI-modified organoclays can be attributed to enhanced carbonaceous char formation during combustion, i.e., charring promoted by the presence of catalytically active TMI.},
doi = {10.1016/j.polymer.2006.12.005},
journal = {Polymer},
number = 3,
volume = 48,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}