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Rheology : important tool for determination of properties of sols for anticorrosion coatings deposition
Slemenik Perše, Lidija ...
Understanding the rheological properties of materials can certainly help to develop a better product, since the physical properties link material formulation and processing stages with the ultimate ...end use and product performance. Rheology is used to measure fluid properties like viscosity, as a function of shear rate/shear stress, in order to determine non-Newtonian flow behaviour, or to measure complex rheological properties such as viscoelasticity (G', G'') as a function of frequency (time) or temperature. Rheological properties are of great importance also from the aspect of dispersing the nanoparticles in formulations. In this work the rheological properties of sol compositions for the deposition of anticorrosion coatings on the basis of 3-glycidoxypropyltrimethoxysilane (GPTMS) were studied. The important feature of GPTMS is that on one side of the molecule it can react via sol-gel processes, while epoxy ring on the other side of the precursor can be opened by amino moieties. We applied poly(dimethylsiloxane), aminopropyl terminated (NH2-PDMS-NH2) for this purpose. In addition, trisilanol-heptaisooctyl POSS (polyhedral oligomeric silsesquioxanes) molecules were added to strengthen and thicken the coatings. An important property of POSS is that they can be used to tune the chemical and physical properties of the coatings through functionalization of their organic shell and the open-cage POSS can bind into the sol-gel matrix. Detailed rheological measurements were made for sols prepared on the basis of all three described precursors, acidic catalyst and alcoholic solvent. During sol-gel processes the changes in rheological properties were followed with time-oscillation tests in the linear viscoelastic range. The results enabled evaluation of the effect of the addition of NH2-PDMS-NH2to GPTMS on time of gelation and viscoelastic properties of formed gels. This research was funded from Slovenian research agency (ERA NET project Bonaco and Programme P1-0030).
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