Benzyl dimethyl montmorillonite

Increases in shear intensity for the dispersion of montmorillonite into epoxy offer incremental improvements in exfoliated and aligned particle composites. A Lightnin LabMaster SI Mixer was evaluated for the dispersion of Cloisite 30B into EPON 828 [31] and a more effective method, ball milling, was evaluated with montmorillonite exchanged with dodecyl benzyl dimethyl quaternary ammonium ions and meta-xylenediamine [32,33]. 

The unstained TEM was the most insightful. The organomontmoril-lonite selection for this work was more limited in relation to the work above. Cloisite 30B, 25A, 20A, and montmorillonite exchanged with benzyl dimethyl hydrogenated tallow quaternary ammonium ion were evaluated. SAN from the above work was the control. The TEM of the unstained ABS indicates the close association of the Cloisite 30B to the interface of the rubber-dispersed phase particles. 

The use of a reversible addition-fragmentation chain transfer (RAFT)-con-trolled polymerization method to synthesize polystyrene-clay nanocomposites in miniemulsion was reported by Samakande et For this purpose, the RAFT-grafted montmorillonite clays A,A-dimethyl-A-(4- [(phenylcarbonothioyl)thio]-methyl benzyl)ethanammonium-MMT (PCDBAB-MMT) and A-[4-( [(dodecyl-thio)carbonothioyl]thio methyl)benzyl]-A,A-dimethylethanammonium-MMT (DCTBAB-MMT), were used in different amounts. 

The monomers used were styrene (Aldrich) and divinylbenzene (DVB, Aldrich), where DVB is composed of 55% mixtirre of isomers containing ethylvinylbenzene as a main remainder. Two types of organoclay, ClOA and C20A, and one type of natural clay, sodium montmorillonite (NaMMT) all from Southern Clay Product were used. ClOA and C20A are modified with a dimethyl benzyl hydrogenatedtaUow qiratemary ammonium and a dimethyl dihydrogenatedtallow, qiratemary ammonium,... 

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