Effect of Polymer Matrix on the Oxygen Pressure Sensitivity of Pressure Sensitive Paints
Author(s): Guo-wei Yu, Zhi-dong Wang, Xiao-zhong Qu, Yi Shi, Bi-qing Jin, Zhi-tian Liu, Xi-gao Jin, School of Material Science and Engineering, Wuhan Institute of Technology, State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences
Pages: 350-355
Year: 2014 Issue: 3
Journal: Acta Polymerica Sinica
Keyword: Pressure sensitive paint; Polymer matrix; Chromophoric probe; Luminescence quenching; Oxygen pressure sensitivity;
Abstract: Based on luminescence quenching of chromophoric probes in oxygen permeable polymer matrix, pressure sensitive paint( PSP) and its devices have been developed as a kind of functional materials in recent years. The pressure sensitivity of PSP not only depends on the probe molecules,but also on the polymer matrix. In this work,tetrakis( pentafluorophenyl) porphyrin platinum( PtTFPP),as a luminescent probe,was composed with polydimethylsiloxane( PDMS),polymethylphenylsiloxane( PMPS),polymethyltrifluoropropylsiloxane( PFS) and trifluorochloroethylene-vinyl acetate copolymer( PFC) respectively,and then their luminescence quenching behaviors were measured at an excitation of λ = 365 nm with various oxygen concentrations from 0% to 100%. The ratio I0/ I100is used as oxygen sensitivity of PSP films,where I0and I100represent the fluorescence intensities from films exposed to 100% nitrogen and 100% oxygen,respectively. The I0/ I100values of the PtTFPP-based films are evaluated. It is found that the plots of I0/ I versus [O2]with identical Ksv are obtained and a two-site model fits the experiment data very well for the PtTFPP / polymer systems,except PtTFPP / PFC films. The values of I0/ I100and Ksvfor such materials increased with increasing the oxygen permeability of the polymer matrix,i. e. PDMS > PMPS > PFS > PFC,which is identical with theoretical reasoning. Therefore it could be concluded that the oxygen quenching for the PSP materials in this work showed a diffusion-controlled mechanism.
Pages: 350-355
Year: 2014 Issue: 3
Journal: Acta Polymerica Sinica
Keyword: Pressure sensitive paint; Polymer matrix; Chromophoric probe; Luminescence quenching; Oxygen pressure sensitivity;
Abstract: Based on luminescence quenching of chromophoric probes in oxygen permeable polymer matrix, pressure sensitive paint( PSP) and its devices have been developed as a kind of functional materials in recent years. The pressure sensitivity of PSP not only depends on the probe molecules,but also on the polymer matrix. In this work,tetrakis( pentafluorophenyl) porphyrin platinum( PtTFPP),as a luminescent probe,was composed with polydimethylsiloxane( PDMS),polymethylphenylsiloxane( PMPS),polymethyltrifluoropropylsiloxane( PFS) and trifluorochloroethylene-vinyl acetate copolymer( PFC) respectively,and then their luminescence quenching behaviors were measured at an excitation of λ = 365 nm with various oxygen concentrations from 0% to 100%. The ratio I0/ I100is used as oxygen sensitivity of PSP films,where I0and I100represent the fluorescence intensities from films exposed to 100% nitrogen and 100% oxygen,respectively. The I0/ I100values of the PtTFPP-based films are evaluated. It is found that the plots of I0/ I versus [O2]with identical Ksv are obtained and a two-site model fits the experiment data very well for the PtTFPP / polymer systems,except PtTFPP / PFC films. The values of I0/ I100and Ksvfor such materials increased with increasing the oxygen permeability of the polymer matrix,i. e. PDMS > PMPS > PFS > PFC,which is identical with theoretical reasoning. Therefore it could be concluded that the oxygen quenching for the PSP materials in this work showed a diffusion-controlled mechanism.
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