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A series of poly(phenylenevinylene) (PPV)/titanium oxide (TiO2) nanocomposites with different contents of TiO2 nanoparticles were prepared from mixtures of PPV rrrrrrrrrnprecursor and titanium butoxide ethanol solution in a sol-gel process. TEM images rrrrrrrrrnshowed the formation of the connected network of TiO2 nanoparticles with a higher rrrrrrrrrncontent of TiO2, which resulted in the titanium butoxide hydrolyzed to form Ti organic rrrrrrrrrncompound. Meanwhile, the conjugation of PPV polymer chains can be interrupted by rrrrrrrrrnthe TiO2 network structure. The PL spectra revealed that the emitted light of the rrrrrrrrrnPPV/TiO2 nanocomposites blue shifted without fine structure and the PL intensity rrrrrrrrrnenhanced when the TiO2 network formed. In the lifetime spectroscopy of positron rrrrrrrrrnannihilation, the structural properties of the PPV dominated the character of the rrrrrrrrrnnanocomposites, in which the formation of the o-Ps was presented in free volume pf rrrrrrrrrnpolymer, when the content of TiO2 was below 10%. Further increasing the content rrrrrrrrrnof TiO2
A series of poly (phenylenevinylene) (PPV) / titanium oxide (TiO2) nanocomposites with different contents of TiO2 nanoparticles were prepared from mixtures of PPV r r r r r r r r nprecursor and titanium butoxide ethanol solution in a sol-gel process. TEM images r r r r r r r r r r r nshowed the formation of the connected network of TiO2 nanoparticles with a higher r r r r r r r r r ncontent of TiO2, which resulted in the titanium butoxide hydrolyzed to form Ti organic r r r r r r r r ncompound . The conjugation of PPV polymer chains can be interrupted by r r r r r r r r r nthe TiO2 network structure. The PL spectra revealed that the emitted light of the r r r r r r r r nPPV / TiO2 nanocomposites blue shifted without fine structure and the PL intensity r r r r r r r r nenhanced when the TiO2 network formed. In the lifetime spectroscopy of positron r r r r r r r r nannihilation, the structural properties of the PPV dominated the character of the r r r r r r r r r n nanocomposites, in which the formation of the o-Ps was presented in a free volume pf r r r r r r r npolymer, when the content of TiO2 was below 10%. the content r r r r r r r r r n n TiO2