Effect of gamma irradiation on latex film dissolution


Aydin K., Ugur S. , PEKCAN O.

JOURNAL OF COLLOID AND INTERFACE SCIENCE, cilt.233, ss.91-98, 2001 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 233 Konu: 1
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1006/jcis.2000.7151
  • Dergi Adı: JOURNAL OF COLLOID AND INTERFACE SCIENCE
  • Sayfa Sayıları: ss.91-98

Özet

Latex films have been prepared by annealing pyrene (Py)-labeled poly(methyl methacrylate)-polyisobutylene particles at the glass transition temperature (100 degreesC). These films were then irradiated by gamma rays from Co-60 in a gamma cell at room temperature at various dose rates (rad/h). Before dissolution the films were annealed at 200 degreesC for a 30 min time interval to complete the film formation process. Steady-state fluorescence techniques were used to monitor the dissolution of irradiated latex films. Dissolution of films in a chloroform-heptane (80%-20%) mixture was monitored in real time by the Py fluorescence intensity change. Relaxation constants, k(0), and dissolution coefficients, D-d, Of polymer chains were measured. Two different regimes of D-d values were observed during dissolution, which are related to two different molecular weight distributions caused by scission and branching of polymer chains when they were irradiated and annealed. a zool Academic Press.