Document Type : Original Article
Authors
1 Iranian Space Research Center
2 Department of chemical and petroleum Engineering, Sharif university of technology, Tehran, Iran.
Abstract
Achieving a flawless solid composite propellant requires proper processability of its corresponding filled polymer slurry. In other words, a highly filled suspension with optimal rheological properties makes it possible to transfer to the mold and complete filling in complex geometries. In this dynamic study, the rheological properties of the obtained suspensions have been investigated after adding molybdenum disulfide nanoparticles to the model materials.
In order to study the effect of molybdenum disulfide nanosheets on the rheological behavior of the suspensions, polyethylene glycol matrix and glass beads, with particle distribution of 60 to 103 microns were used as a model.
Single- layer and multi- layer molybdenum disulfide nanosheets with thickness of 50 to 100 nm was obtained using acid washing, oxidation and heat shock of raw molybdenum disulfide. Then, after preparation of suspensions containing 10- 40 vol% glass beads, the effect of obtained molybdenum disulfide (less than 0.1 vol% of the matrix) on the rheological properties of the mixture was studied. The results of frequency sweep and temperature sweep tests showed that by increasing the percentage of molybdenum disulfide nanosheets by less than 0.1%,The mixed viscosity has a significant decreasing in all microfiller values while maintaining the storage modulus and increasing the loss modulus. Finally, the dynamic shear flow test demonstrated that the dynamic viscosity also decreased significantly after the addition of nanoparticles.
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