Development of fast-responding Pressure-Sensitive Paint with low temperature sensitive using poly(trimethylsilyl)propyne

Abstract

In this study, sprayable fast-responding pressure-sensitive paint (fast-PSP) with low temperature sensitivity has been investigated. Fast-PSP has a porous binder composed of a polymer and nanoparticles to enhance the oxygen diffusivity. However, it is known that higher mass content of nanoparticles in the porous binder causes an increase in temperature sensitivity of fast-PSP. To develop fast-PSP with a temperature sensitivity of less than 1.0 %/K and a response time of less than 100μs, we employed poly(trimethylsilyl)propyne (poly(TMSP)), which is a glassy polymer with a large free volume and has the highest-oxygen permeability among the existing polymers, as a polymer. Three different nanoparticles of mesoporous silica, boron nitride (BN), and titanium silicon oxide were mixed with poly(TMSP) at various particle mass contents to form porous binder. We investigated the effect of particle type and particle mass content, dye concentration, and binder thickness on the static and dynamic characteristics of PSP. The newly developed fast-PSP successfully achieved a low temperature sensitivity of 0.7 %/K even at a fast response time of less than 100 μs when poly(TMSP) and mesoporous silica were mixed at particle mass contents of 50 to 60 wt%, and the binder thickness was 2 - 5μm.

Keywords

• pressure sensitive paint
• temperature sensitivity
• fast response
• unsteady measurement
• pressure sensor