Fluorescence method of studying void closure kinetics during film formation from high-T latex particles

✍ Scribed by Önder Pekcan; Murat Canpolat

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 259 KB
• Volume: 66
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19971024)66:4<655::aid-app5>3.0.co;2-r

✦ Synopsis

Void closure process due to viscous flow was studied during film formation from high-T latex particles. Steady-state fluorescence and photon transmission techniques were used to probe the evolution of optical clarity during film formation. The latex films were prepared from pyrene (P)-labeled poly(methyl methacrylate) particles and annealed in 10-min time intervals above glass transition temperature. Fluorescence intensity from P was measured after each annealing step. A relation for void closure time versus fluorescence intensity was derived, using the Vogel-Fulcher equation. Viscosity constant B was measured from the above relation and found to be as 11 1 10 3 K.