Abstract:In order to improve the compatibility and dispersion of antimony trioxide nanoparticles (nano-Sb 2 O 3 ) in polyvinyl chloride (PVC) and improve the comprehensive properties of PVC, a novel type of nano-Sb 2 O 3 /DOP/PVC composites was prepared by using nano-Sb 2 O 3 modified by dioctyl phthalate (DOP) as flame retardant and the mechanical properties and flame-retardant properties of the composites were studied. The results indicated that nano-Sb 2 O 3 particles modified by appropriate DOP could improve the fl… Show more
“…As the agglomerate is weakened, it is easier to be broken into a smaller agglomerate. The ability of plasticizer in breaking and modifying the size of agglomerates is proven in the field of flame-retardant materials [55], nanocomposites [56], and processing minerals [57]. The small agglomerates are aligned on the liquid to flow and it is suggested as the mechanism of plasticizer in lowering viscosity [29], described in Figure 12c.…”
An alarming, asymmetric flame in rocket combustion originates from a composite solid propellant (CSP) containing defects. The defects are the result of a composition that exceeds the maximum particle packing density. Based on the structure analysis of CSP, the addition of plasticizer causes the correlation between the viscosity of CSP slurry and particle packing density to become uncertain. This work aims to investigate the influence of thixotropic behavior on the maximum particle packing density of CSP. A CSP with different thixotropic behavior was successfully produced using aluminum/plasticizer dioctyl adipate (DOA) of 12–24. During the curing process, viscosity and stress–growth were investigated. The structure of the CSP was defined using X-ray radiography. It is remarkably observed that the peak of thixotropy occurred at the 15th minute of the curing process. The particle packing density of CSP can be decisive for the relative viscosity at the peak time of thixotropic behavior. The CSP with the highest relative viscosity at the peak time was revealed to have voids in the upper part of the CSP. Thus, this parameter was proven to change the preceding parameter, viscosity that was measured at the end of mixing. Based on the stress–growth analysis, it is conceivable that the mechanism involves the time-dependent diffusion of DOA in weakening aluminum agglomerates.
“…As the agglomerate is weakened, it is easier to be broken into a smaller agglomerate. The ability of plasticizer in breaking and modifying the size of agglomerates is proven in the field of flame-retardant materials [55], nanocomposites [56], and processing minerals [57]. The small agglomerates are aligned on the liquid to flow and it is suggested as the mechanism of plasticizer in lowering viscosity [29], described in Figure 12c.…”
An alarming, asymmetric flame in rocket combustion originates from a composite solid propellant (CSP) containing defects. The defects are the result of a composition that exceeds the maximum particle packing density. Based on the structure analysis of CSP, the addition of plasticizer causes the correlation between the viscosity of CSP slurry and particle packing density to become uncertain. This work aims to investigate the influence of thixotropic behavior on the maximum particle packing density of CSP. A CSP with different thixotropic behavior was successfully produced using aluminum/plasticizer dioctyl adipate (DOA) of 12–24. During the curing process, viscosity and stress–growth were investigated. The structure of the CSP was defined using X-ray radiography. It is remarkably observed that the peak of thixotropy occurred at the 15th minute of the curing process. The particle packing density of CSP can be decisive for the relative viscosity at the peak time of thixotropic behavior. The CSP with the highest relative viscosity at the peak time was revealed to have voids in the upper part of the CSP. Thus, this parameter was proven to change the preceding parameter, viscosity that was measured at the end of mixing. Based on the stress–growth analysis, it is conceivable that the mechanism involves the time-dependent diffusion of DOA in weakening aluminum agglomerates.
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