Study of Structural Evolution of Crystalline Polymer Latex Films by Brillouin Scattering (CAT#: STEM-ST-0102-YJL)

Introduction

Polymer film formation plays a crucial role in many technological applications, ranging from paints to adhesives, printing inks, textiles, and friction reducers. Among these systems polytetrafluoroethylene (PTFE) and PTFE derivatives have unique wetting, frictional, and dielectric properties, essentially by virtue of a thermally stable crystalline phase. The few existing studies of perfluorinated latex polymer films have been aimed at characterizing their macroscopic thermal or dielectric properties while much less is known about the filming of crystalline polymers, where processes such as recrystallization upon cooling strongly influence the morphology of the resulting film.

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Principle Applications Procedure Materials Notes Related Products

Principle

From a quantum point of view, Brillouin scattering is an interaction of light photons with acoustic or vibrational quanta (phonons), with magnetic spin waves (magnons), or with other low frequency quasiparticles interacting with light. The interaction consists of an inelastic scattering process in which a phonon or magnon is either created (Stokes process) or annihilated (anti-Stokes process). The energy of the scattered light is slightly changed, that is decreased for a Stokes process and increased for an anti-Stokes process. This shift, known as the Brillouin shift, is equal to the energy of the interacting phonon and magnon and thus Brillouin scattering can be used to measure phonon and magnon energies.

Applications

Brillouin scattering is used to determine acoustic velocities and elastic properties of a number of crystalline solids, glasses, and liquids.

Procedure

1. Sample preparation
2. Measurement by scattering detection instrument
3. Data analysis

Materials

Brillouin scattering measurement system (Brillouin spectrometer)

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