Akademik Veri Yönetim Sistemi
ACS Symposium Series, cilt.648, ss.64-78, 1996 (Scopus)
Direct energy transfer (DET) method conjunction with steady state fluorescence (SSF) technique were used to study interdiffusion of polymer chains across the particle-particle junction, during film formation from high-T latex particles. The latex films were prepared from pyrene (P) and naphthalene (N) labeled poly (methyl methacrylate) (PMMA) particles and annealed in elevated time intervals above glass transition (Tg) at 180°C. Monte Carlo simulations were performed to model the N and P fluorescence intensities (IN and Ip) using photon diffusion theory. Number of N and P photons (NN and Np), emerging from the front surface of the latex film are calculated when only N is excited. A novel correction method was suggested and employed to eliminate the P intensity due to the optical variation in latex film. P intensity solely from the energy transfer processes were monitored versus annealing time and was used to measure the polymer chain diffusion coefficient (D), which was found to be 5.9 × 10-13 cm2/sec at 180°C.