Organic Modification Of Montmorillonite With Low Molecular Weight Polyethylene Glycols And İts Use İn Polyurethane Nanocomposite Foams
Abstract
This paper deals with the preparation of organoclays by intercalating poly(ethylene glycol) molecules (PEG) between Na montmorillonite (Na-MMT) layers in a clay-water suspension system. X-ray diffraction (XRD) results of organoclays revealed that galleries of MMT were expanded after their intercalation with three different low molecular weight PEGs, including PEG600, PEG1000 and PEG1500. Thus, the distance of the interlayer spacing of MMT, d = 1.38 nm, was increased to d = 1.72, 1.75 and 1.69 nm, respectively, in the organoclay samples. The results of Fourier transform infrared spectroscopic (FTIR), thermogravimetric (IG) and scanning electron microscopic (SEM) analyses supported the findings of XRD and implied that the clay mineral mainly lost its hydrophilic character and gained organophilic features. The organoclay samples also presented improved thermal stabilities. In addition, polyurethane rigid nanocomposite foams composed of 2% organoclays were synthesized, and the effects of the organoclays on the thermal and mechanical performance of the nanocomposite foams were investigated. (C) 2010 Elsevier B.V. All rights reserved.
Subject
Nanocomposite
Organoclay
Polyurethane
PEG
XRD
DMA
poly(ethylene oxide)
clay nanocomposites
polystyrene nanocomposites
silicate nanocomposites
melt intercalation
barrier properties
thermal-stability
hybrid
surfactants
organokil
Poliüretan
kil nanokompozitler
silikat nanokompozitler
bariyer özellikleri
termal kararlılık
melez
yüzey aktif
Organoclay
Polyurethane
PEG
XRD
DMA
poly(ethylene oxide)
clay nanocomposites
polystyrene nanocomposites
silicate nanocomposites
melt intercalation
barrier properties
thermal-stability
hybrid
surfactants
organokil
Poliüretan
kil nanokompozitler
silikat nanokompozitler
bariyer özellikleri
termal kararlılık
melez
yüzey aktif
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- Makaleler / Articles [122]
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