The effect of self absorption on the ratio of excimer to monochromophore emission intensities, I-e/I-m, has been explored by experimentally changing the solution layer thickness of the emission light path traversed in...The effect of self absorption on the ratio of excimer to monochromophore emission intensities, I-e/I-m, has been explored by experimentally changing the solution layer thickness of the emission light path traversed in the solution in the right-angle geometry. The result shows that data obtained by front-face geometry are better than those obtained by right-angle geometry even after correction to zero solution thickness. The correction formula based on geometric optics given by Tsai and Torkelson is not adequate.展开更多
The polymerization of styrene is monitored by pyrene excimer formation. The ratio of monomer to excimer intensities ( I m/ I e) of pyrene increases as polymerization proceeds. The increase of I m/ I e...The polymerization of styrene is monitored by pyrene excimer formation. The ratio of monomer to excimer intensities ( I m/ I e) of pyrene increases as polymerization proceeds. The increase of I m/ I e is ascribed to the increase of microviscosity surrounding the probes forming excimer during polymerization. The linear relationship between the changing rate of I m/ I e and the polymerization rate of styrene is obtained. Therefore, I m/ I e may be used to monitor the progress of the polymerization of styrene.展开更多
Excimer formation in pyrenyl labeled polystyrene has been investigated in dilutesolution region. The change of the intensity ratio of excimer to monomer (Ie/Im) with increasingconcentration (C), is interpreted by intr...Excimer formation in pyrenyl labeled polystyrene has been investigated in dilutesolution region. The change of the intensity ratio of excimer to monomer (Ie/Im) with increasingconcentration (C), is interpreted by intrachain and interchain interactions. The double logarithmicPlot of Ie/Im vs C displays two critical points, Cs at about 2.5×10-3g/ml and C+ at about 3.2×10-2g/ml. In dilute region C<Cs, excimer formation may be controlled by intrachain interaction.展开更多
基金This work was supported by the National Key Projects for Fundamental Research, "Macromolecular Condensed State", of Ministry of Science and Technology, China.
文摘The effect of self absorption on the ratio of excimer to monochromophore emission intensities, I-e/I-m, has been explored by experimentally changing the solution layer thickness of the emission light path traversed in the solution in the right-angle geometry. The result shows that data obtained by front-face geometry are better than those obtained by right-angle geometry even after correction to zero solution thickness. The correction formula based on geometric optics given by Tsai and Torkelson is not adequate.
文摘The polymerization of styrene is monitored by pyrene excimer formation. The ratio of monomer to excimer intensities ( I m/ I e) of pyrene increases as polymerization proceeds. The increase of I m/ I e is ascribed to the increase of microviscosity surrounding the probes forming excimer during polymerization. The linear relationship between the changing rate of I m/ I e and the polymerization rate of styrene is obtained. Therefore, I m/ I e may be used to monitor the progress of the polymerization of styrene.
文摘Excimer formation in pyrenyl labeled polystyrene has been investigated in dilutesolution region. The change of the intensity ratio of excimer to monomer (Ie/Im) with increasingconcentration (C), is interpreted by intrachain and interchain interactions. The double logarithmicPlot of Ie/Im vs C displays two critical points, Cs at about 2.5×10-3g/ml and C+ at about 3.2×10-2g/ml. In dilute region C<Cs, excimer formation may be controlled by intrachain interaction.
