Direct fluorescence technique to study evolution in transparency and crossing density at polymer-polymer interface during film formation from high-T latex particles

Key Points

• The aim is to explore how transparency and crossing density evolve during latex film formation above the glass transition temperature.
• Utilized Direct Fluorescence method to study healing processes.
• Prepared latex films from pyrene-labeled poly(methyl methacrylate) particles.
• Employed steady-state fluorescence to measure polymer crossing density.
• Analyzed films with varying latex content below and above healing temperature.
• Found that crossing density increases linearly with the square root of time.
• Demonstrated that transparency depends on the latex content and temperature.
• Confirmed healing effects during film formation above glass transition temperature.