The synthesis of poly（2-methoxy-5-（2＇-ethyl-hexyloxy）-l,4-phenylenevinylene） （MEH-PPV） in the presence of organophilic montmorillonite （OMMT） was reported and the exfoliated MEH-PPV/OMMT nanocomposites was ob...The synthesis of poly（2-methoxy-5-（2＇-ethyl-hexyloxy）-l,4-phenylenevinylene） （MEH-PPV） in the presence of organophilic montmorillonite （OMMT） was reported and the exfoliated MEH-PPV/OMMT nanocomposites was obtained by controlling the ratio of the monomer to the OMMT.展开更多
^13C spin-lattice relaxation times （T1） of a conjugated polymer MEH-PPV in polymer/ layered silicate nanocomposites together with the steady state fluorescence emission and transient fluorescence decay measurements ...^13C spin-lattice relaxation times （T1） of a conjugated polymer MEH-PPV in polymer/ layered silicate nanocomposites together with the steady state fluorescence emission and transient fluorescence decay measurements have been investigated. The T1 values of the conjugated carbons decrease dramatically according to the reduction of polymer concentration in the nano composites, while the fluorescence life times （τ） show a linear prolonging tendency. The results are explained from the point of view of molecular dynamics.展开更多
C spin-lattice relaxtion times for polystyrene nanolatex particles have been investigated. It was found that the dramatic increase at 80℃ annealing temperature is well below the Tg temperature of bulk polystyrene, t...C spin-lattice relaxtion times for polystyrene nanolatex particles have been investigated. It was found that the dramatic increase at 80℃ annealing temperature is well below the Tg temperature of bulk polystyrene, the increase of relaxation time of aromatic carbons is larger than that of for aliphatic carbons at transition annealing temperature.展开更多
基金This work was supported by the National Natural Science Foundation of China,Grant No.20023003.
文摘The synthesis of poly（2-methoxy-5-（2＇-ethyl-hexyloxy）-l,4-phenylenevinylene） （MEH-PPV） in the presence of organophilic montmorillonite （OMMT） was reported and the exfoliated MEH-PPV/OMMT nanocomposites was obtained by controlling the ratio of the monomer to the OMMT.
基金supported by the National Natural Science Foundation of China(Grant No.20023003).
文摘^13C spin-lattice relaxation times （T1） of a conjugated polymer MEH-PPV in polymer/ layered silicate nanocomposites together with the steady state fluorescence emission and transient fluorescence decay measurements have been investigated. The T1 values of the conjugated carbons decrease dramatically according to the reduction of polymer concentration in the nano composites, while the fluorescence life times （τ） show a linear prolonging tendency. The results are explained from the point of view of molecular dynamics.
基金This work was supported by National Key Project for Fundamental Research (N.95-11) and National Natural Science Foundation of Ch
文摘C spin-lattice relaxtion times for polystyrene nanolatex particles have been investigated. It was found that the dramatic increase at 80℃ annealing temperature is well below the Tg temperature of bulk polystyrene, the increase of relaxation time of aromatic carbons is larger than that of for aliphatic carbons at transition annealing temperature.
