Abstract
To render layered silicates miscible with polymer matrices, one must convert the normally hydrophilic silicate surface to an organophilic one, making the intercalation of polymeric chain between silicate layers possible. This can be done by ion-exchange reactions with cationic surfactants. Sodium montmorillonite (Na-MMT) was modified with several organic cationic surfactants. Organoclays with water soluble surfactants were prepared by the traditional cation exchange reaction. An alternative procedure was used to prepare organoclays with water insoluble salts. The basal spacing and thermal behavior of organoclays were characterized by X-ray diffraction, XRD and Thermogravimetric analysis, TGA respectively.
Highlights
In recent years polymer/layered silicates nanocomposites have attracted great interest, both in industries and academia
We present preparation and characterization of new organo-montmorillonite clays by using ammonium surfactant and phosphonium surfactant which contain one or more hydrophobic groups such as long alkyl chains, phenyl and stearate
X-ray diffraction (XRD) of different samples of modified MMT clay give the values of basal spacing
Summary
In recent years polymer/layered silicates nanocomposites have attracted great interest, both in industries and academia. The possible application of generated organoclay is the better intercalation of polymer chains between stacks of MMT clay. Montmorillonite, and other layered silicate clays are naturally hydrophilic This makes them poorly suited to mixing and interacting with most polymer matrices which are mostly hydrophobic [1,2,3]. By exchanging ions present in between layers with various organic cations, montmorillonite clay can be compatibilized with a wide variety of matrix polymers. The basal spacing of the resulting organoclays depends on the chemical structure of the surfactant, the degree of cation exchange, and silicate layer thickness [4]. We present preparation and characterization of new organo-montmorillonite clays by using ammonium surfactant and phosphonium surfactant which contain one or more hydrophobic groups such as long alkyl chains, phenyl and stearate. We report the basal spacing by XRD measurements and thermal behavior by TGA
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