Add time:09/24/2019         Source:sciencedirect.com

Fluorescence depolarization is used to investigate the motions of four rigid probes of different sizes, 9,10-dimethylanthracene (DMA), 1,4-diphenylbutadiene (DPBD), 1,6-diphenylhexatriene (DPHT), and 1,8-diphenyloctatetraene (DPOT) inserted in a polyisoprene (IR 307), two polybutadienes (Diene 45 NF and Solprene 248) and three random butadiene-styrene copolymer matrices. Fluorescence anisotropy decay experiments have revealed that these motions follow the isotropic motional model. The correlation times were calculated, using this model, from stationary fluorescence depolarization measurements as a function of temperature. Large probes are shown to reflect the glass-rubber relaxation in agreement with the WLF law. The size dependence of the probe correlation times is also analysed.

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