Measuring chain diffusion coefficients and activation energy during coalescence of fluorescence-labeled hard latex particles


Canpolat M., Pekcan O.

ACTA POLYMERICA, cilt.48, ss.326-333, 1997 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 48 Konu: 8
  • Basım Tarihi: 1997
  • Doi Numarası: 10.1002/actp.1997.010480806
  • Dergi Adı: ACTA POLYMERICA
  • Sayfa Sayıları: ss.326-333

Özet

The steady-state fluorescence (SSF) technique was used to study interdiffusion of polymer chains across the particle-particle junction during film formation from hard latex particles. The latex films were prepared from pyrene (P) and naphthalene (N) labeled poly(methyl methacrylate) (PMMA) particles and annealed for long time intervals above the glass transition temperature (T-g) between 170 and 220 degrees C. A novel correction method was suggested and employed to eliminate changing of the optical density of latex films after such annealing processes. P and N fluorescence intensities solely from the energy-transfer processes were monitored versus annealing time and were used to measure the polymer chain diffusion coefficients D-P and D-N, which were found to be between 4.34 x 10(-14) and 7.68 x 10(-13) cm(2)/s for an annealing temperature between 170 and 220 degrees C. Using these diffusion coefficients With the Arrhenius relation, the diffusion activation energy for the polymer backbone was found to be 2.8 kcal/mol.