Sequencing & design of processing instruments alter the degree of dispersion of clays and mechanical properties of nanocomposites
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Polyurethane coatings reinforced with nano clay especially organo-modified clay, show high sensitivity to changes in structure, properties, and performance when the sequence and design of its processing instruments are slightly altered. Using 1 weight percentage cloisite C30B nano-filled polyurethane coating formulations, we demonstrate that a combination of probe sonicator (PS) and ultrasonic bath (USB) can process these coatings into structurally different nanocomposite coatings possessing varied properties. In process-P, we combined the PS and USB into parallel (simultaneous usage) while in process-S we used USB first and PS later for processing the formulations in series combinations. These coating formulations were characterized for mechanical and barrier properties and tried to correlate with the degree of dispersion of clays in the PU matrix. The effect of the design of processing instruments on mechanical properties was studied by replacing PS with M (Mechanical homogenizing mixer) in parallel and series sequencing. This kind of sensitivity to processing sequences for these nanocomposite coatings was unknown and requires greater investigations for generalizing the results for all other nanofillers.
Abstract
Polyurethane coatings reinforced with nano clay especially organo-modified clay, show high sensitivity to changes in structure, properties, and performance when the sequence and design of its processing instruments are slightly altered. Using 1 weight percentage cloisite C30B nano-filled polyurethane coating formulations, we demonstrate that a combination of probe sonicator (PS) and ultrasonic bath (USB) can process these coatings into structurally different nanocomposite coatings possessing varied properties. In process-P, we combined the PS and USB into parallel (simultaneous usage) while in process-S we used USB first and PS later for processing the formulations in series combinations. These coating formulations were characterized for mechanical and barrier properties and tried to correlate with the degree of dispersion of clays in the PU matrix. The effect of the design of processing instruments on mechanical properties was studied by replacing PS with M (Mechanical homogenizing mixer) in parallel and series sequencing. This kind of sensitivity to processing sequences for these nanocomposite coatings was unknown and requires greater investigations for generalizing the results for all other nanofillers.
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