The effect of solid content on latex coalescence and film formation: Steady-state energy transfer study with fluorescence labeled polymers
✍ Scribed by M. Canpolat; Ö. Pekcan
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 633 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
The steady-state fluorescence technique was used to examine the healing and interdiffusion of polymer molecules as a function of solid content during annealing of latex films above the glass transition (Tg). Films were prepared from a mixture of naphthalene (N)and pyrene (P)-labeled poly (methy methacrylate) (PMMA) latex particles. Above Tg, interdiffusion of polymer chains was observed by detecting the steady-state energy transfer from excited naphthalene to pyrene molecules. Various latex films with different latex content were used to measure the critical occupation percent for the reliable steady-state fluorescence measurements. Diffusion activation energies in these latex films were measured and found to be around 30 kcal/mol, which was attributed to the backbone motion of PMMA chains.