Preparation And Characterization Of Alkylphosphonium Montmorillonite As Nanofiller For Polymethyl Methacrylate Acid Composites
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Date
2018
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Publisher
Universiti Malaysia Terengganu
Abstract
Sodium montmorillonite (Na+ -MMT) is one of the natural clay uses worldwide as
nano filler in polymer nanocomposite. Na+-MMT is naturally hydrophilic in nature
and cannot dispersed easily in organic polymer matrix as polymer has hydrophobic
characteristic. Thus surface of MMT must undergo certain modifications to improve
its ability to disperse in polymer matrix in the fonn of organophilic MMT (OMMT).
Currently commercial OMMT are modified from alkyl ammonium surfactant, which
has low thennal stability which unable them to withstand high temperature for
thermal polymer processing. Considering steric tolerance of phosphorus atom by
participation of its low energy d-orbitals, in breaking and fonnation of bond, alkyl
phosphonium surfactants are propose in this study as an altemative surface modifier
to alkylammonium which expected to increase the thermal stability of modified
clay. Triisobutyl(methyl)phosphonium (TBMP) and tetrabutylphosphonium chloride
(TBP) were used as surface modifier in the modification of Na+-MMT via ion
exchange reaction fonning OMMT's. (TBMP-MMT and TBP-MMT). The Na+
MMT, OMMT and commercial MMT (Cloisite 93A) were characterized and
compared based on their elemental composition (CHNS), chemical structure (FTIR,
BET analysis) and morphology (XRD), and them1al properties (TGA).
Description
Keywords
Alkylphosphonium, Montmorillonite, Methacrylate Acid