Micro balloon

Syntactic foams are composites made of micro-balloons or hollow macrospheres bound into a plastic matrix. The polyimide syntactic foams are used in specific electronic equipment for microwave and RF applications. They act as structural, dielectric and heat-barrier materials. Micro-balloons can be made of polyimides for special applications. 

Syntactic foams are composites made up of micro-balloons or hollow macrospheres bound into a plastic matrix. 

A mixture of ammonium nitrate and water forms a low strength explosive known as a slurry explosive. In order to obtain a subsequent detonation propagation after detonation initiation, micro-balloons made of glass or plastics are also added to the explosives. During detonation propagation within the explosives, an adiabatic compression is given by the destruction of the micro-balloons. 

Addition of an anti-solvent to a polymer solution causes the polymer solution to split into a polymer-rich phase and a solvent-rich phase. When a non-solvent is added the overall density of the original solvent becomes lower, which decreases the Lower Critical Solution Temperature (LCST) of the solution. A liquid-liquid phase-split thus occurs without raising the temperature. A low-molecular weight anti-solvent like CO2, propane or ethane can effectively decrease the LCST of the polymer solution (6) and thus induce a liquid-liquid phase-split. It is due to this effect that Gas Anti-Solvent precipitation of polymers has focused on the production of polymer particles with a specific size, structure or shape such as micro tubes (7) or micro balloons (8). Phase separation phenomena in PPE solutions during the formation of polymer membranes by the addition of a conventional anti-solvent have been described by (9). 

Pelz DM, Fox AJ, Vinuela F, Drake CC, Ferguson GG (1988) Preoperative embolization of brain AVMs with isobutyl-2 cyanoacrylate. AJNR Am J Neuroradiol 9 757-764 Pevsner PH (1977) Micro-balloon catheter for superselective angiography and therapeutic occlusion. AJR Am J Roentgenol 128 225-230... 

Turbulence Control (Microflap, Microballoon, Microsynthetic Jet), Rgure 5 Fabrication procedure of a micro balloon actuator... 

The deflection of a micro balloon actuator depends on the actuation air pressure. Figure 9 shows the deflection versus pressure relationship of a silicone based balloon actuator. It shows the direct relationship between the... 

Micro balloons are convenient to reduce the weight of adhesives because the density of the balloons is very low. Typical micro balloons are 5-300 pm in diameter, and 0.7 g/cm in density. They have hollow structures comprising of silica (60-65 wt.%), alumina (27-33 wt.%), and ferric oxide (less than 4 wt.%) (To2aki 2006). The mixture should be carried out so that the micro balloons could not be broken. Since the macro balloons are difficult to be dispersed into resins, they are mixed with solvents and dispersed. After the mixture, the solvents are extracted by evaporation. 

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