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Your search keyword '"Hussein, Zobir"' showing total 4 results
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4 results on '"Hussein, Zobir"'

1. Flexibility improvement of poly(lactic acid) by stearate-modified layered double hydroxide.

Author

Mahboobeh, Eili, Wan Yunus, Wan Md Zin, Hussein, Zobir, Ahmad, Mansor, Ibrahim, Nor Azowa, Mahboobeh, Eili, Wan Yunus, Wan Md Zin, Hussein, Zobir, Ahmad, Mansor, and Ibrahim, Nor Azowa

Abstract

Poly(lactic acid)/layered double hydroxide (PLA/LDH) nanocomposites were prepared from PLA and stearate-Mg3Al LDH via a solution casting method. The anionic clay Mg3Al LDH was prepared first by coprecipitation method from nitrate salts solution at pH 9 and then modified by stearate anions through an ion exchange reaction. This modification increased the basal spacing of the synthetic clay from 8.72 to 31.68 Å. The presence of stearate ions in the synthesized Mg3Al LDH was shown by the stearate-Mg3Al LDH infrared spectrum. When the stearate-Mg3Al LDH at the low concentration was dispersed in the PLA matrix, its layers were largely delaminated. The presence of 1.0 wt % of the stearate-Mg3Al LDH in the PLA improved drastically (of around 650%) of its elongation at break but retained its tensile strength and modulus as compared to those of the pure PLA.

Published
2010

4. Comparison of In Situ Polymerization and Solution-Dispersion Techniques in the Preparation of Polyimide/Montmorillonite (MMT) Nanocomposites.

Author

Ahmad, Mansor Bin, Gharayebi, Yadollah, Salit, Sapuan, Hussein, Zobir, and Shameli, Kamyar

Subjects
POLYMERIZATION, POLYIMIDES, MONTMORILLONITE, NANOCOMPOSITE materials, DISPERSION (Chemistry), X-ray diffraction, FOURIER transform infrared spectroscopy, TRANSMISSION electron microscopy
Abstract

In this paper, Polyimide/Montmorillonite Nanocomposites (PI/MMT NCs), based on aromatic diamine (4-Aminophenyl sulfone) (APS) and aromatic dianhydride (3,3',4,4'-benzophenonetetracarboxylic dianhydride) (BTDA) were prepared using in situ polymerization and solution-dispersion techniques. The prepared PI/MMT NCs films were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The XRD results showed that at the content of 1.0 wt % Organo Montmorillonite (OMMT) for two techniques and 3.0 wt % OMMT for the in situ polymerization technique, the OMMT was well-intercalated, exfoliated and dispersed into polyimide matrix. The OMMT agglomerated when its amount exceeded 10 wt % and 3.0 wt % for solution-dispersion and in situ polymerization techniques respectively. These results were confirmed by the TEM images of the prepared PI/MMT NCs. The TGA thermograms indicated that thermal stability of prepared PI/MMT NCs were increased with the increase of loading that, the effect is higher for the samples prepared by in situ polymerization technique. [ABSTRACT FROM AUTHOR]

Published
2011
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