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.

Evaluation of characteristics of fast-response pressure-sensitive paint under low-pressure conditions

“…Gregory et al [14] further developed a sprayable porous binder by improving the binder developed by Scroggin et al [13]. In recent years, various polymer-ceramic PSPs (PC-PSPs) have been developed for measurements of unsteadypressure distributions [15][16][17][18][19][20][21]. Egami et al [22] clarified that high-pressure sensitivity and fast response could be achieved by reducing the diameter of the particles with PC-PSPs using tris(bathophenanthroline) ruthenium dichloride (Ru(dpp) 3 ) as the dye.…”

“…Jing et al [32] clarified that the pressure sensitivity and the photostability are improved by adding mesoporous silica to poly(TMSP). Yamazaki et al [20] also developed a fast-response PSP with low-temperature sensitivity using poly(TMSP) and mesoporous silica, although it was developed for measurement in atmospheric pressure conditions.…”