Void closure and interdiffusion processes during latex film formation from surfactant-free polystyrene particles: a fluorescence study


Ugur S. , ELAISSARI A., PEKCAN O.

JOURNAL OF COLLOID AND INTERFACE SCIENCE, cilt.263, ss.674-683, 2003 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 263 Konu: 2
  • Basım Tarihi: 2003
  • Doi Numarası: 10.1016/s0021-9797(03)00398-9
  • Dergi Adı: JOURNAL OF COLLOID AND INTERFACE SCIENCE
  • Sayfa Sayıları: ss.674-683

Özet

This study reports a steady state fluorescence (SSF) technique for studying film formation from surfactant-free polystyrene (PS) latex particles. The latex films were prepared from pyrene (P)-labeled PS particles at room temperature and annealed at elevated temperatures for 5-, 10-, 20-, and 30-min time intervals above the glass transition (T-g) temperature of polystyrene. During the annealing processes, the transparency of the film changed considerably. Scattered light (I-sc) and fluorescence intensity (I-0P) from P were measured after each annealing step to monitor the stages of film formation. Evolution of transparency of latex films were monitored using photon transmission intensity, I-tr. Scanning electron microscopy (SEM) was used to detect variation in the physical structure of annealed films. Onset temperature for film formation, T-0, void closure, T-v, and healing temperatures, T-h, were determined and corresponding activation energies were measured. Void closure and interdiffusion stages were modeled and related activation energies were determined. (C) 2003 Elsevier Inc. All rights reserved.