Steady state fluorescence (SSF) and photon transmission (PT) techniques were used for studying film formation from
TiO2 and Al2O3 covered polystyrene (PS) latex particles. These films were annealed at elevated temperatures in 10 min time intervals above glass transition
(Tg) temperature of polystyrene. Fluorescence emission,
Ip and transmitted photon, Itr intensities were measured after each annealing step to monitor the stages of film formation. Films present dramatic increase in both Itr and Ip above the certain onset temperature called minimum film forming temperature, T0. Dissolution of annealed PS film, with high TiO2 content presented a nice, ordered nano-sized ceramic structure, which may predict the construction of nano-layer photonic crystals. It was observed that latex particles are encapsulated above a critical Al2O3 content of 33 wt% which corresponds to the critical occupation probability of
pc=0.33 at which the film obey the site-percolation model with a critical exponent of 0.45.
Films with various thicknesses were formed from pyrene labeled poly (methyl methacrylate) (PMMA) high Tg latex particles, sterically stabilized by poly isobutylene. Annealing of films were performed above Tg at elevated temperatures up to 270 degree(s)C for 30 min time intervals. UV- Visible technique was used for monitoring of film formation and dissolution. Absorption of chloroform molecules into the annealed latex film was followed by diffusion of PMMA chains into solvent reservoir. Diffusion coefficients of PMMA chains were measured and found to be in between 2.6 x10- 9 cm2 s-1 to 9.7 x 10-13 cm2 s-1 for the latex films in various thicknesses. It was observed that thicker films dissolved much faster than the thinner films.
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