PVA Nanocomposites Of Organoclays Obtained Using Different Cationic Surfactants

Year 2018, Volume: 5 Issue: 2, 415 - 432, 01.01.2018

Cüneyt H. Ünlü , Sevim İşçi Turutoğlu Oya Galioğlu Atıcı , Ömer Işık Ece Nurfer Güngör

https://doi.org/10.18596/jotcsa.307602

Cited By: 1

Abstract

This
study is about preparation of two different organoclays with cationic
surfactants and their poly(vinyl alcohol) nanocomposites with
increased thermal and mechanical behavior. Organoclays were prepared
modifying clay mineral with solution intercalation method using
aqueous solutions of cationic surfactants dodecyltrimethylammonium
bromide (DTABr) and cetylpyridinium bromide (CPBr). Obtained
organoclays (D-MMT and C-MMT for DTABr/MMT and CPBr/MMT,
respectively) were characterized using different methods including
zeta potential and XRD. Results indicated an absolute decrease in
zeta potential about 20 mV for C-MMT, and 14 mV for D-MMT indicating
flocculation and coating of the surface. Moreover measurements
indicated that interlayer distance increased based on basal spacing
peak shift whose value was 1.27 nm for NaMMT, whereas 1.40 nm for
D-MMT, and 1.75 nm for C-MMT. The organoclays were used in
preparation of PVA/clay nanocomposites; thermal stability of the
nanocomposites were determined using TGA, while mechanical strength
measurements were done using DMA. Maximum thermal decomposition
temperature of the pristine PVA and nanocomposites were compared and
an average increase of 4°C were observed. Also activation energy of
the decomposition was observed ca. 40 kj mol^-1 higher than pristine PVA.

Keywords

Polymer/clay nanocomposites, Organoclay, Poly(vinyl alcohol) (PVA), Thermal stability, Cationic surfactants

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