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Study of Mechanical Properties of Amorphous PEI, PES, and PVC by Brillouin Scattering (CAT#: STEM-ST-0113-YJL)

Introduction

Polyetherimide (PEI), polyethersulfone (PES), and polyvinylchloride (PVC) are representative of transparent amorphous polymeric materials that can be seen easily in daily life. PEI and PES are widely used in many products since they show high thermal, electrical, mechanical, chemical, and flame resistivity. PVC, if it is plasticized, also has good insulating properties, and is used in emulsion and suspension polymerization. Therefore, a broad understanding of these polymers under extreme conditions is essential, but their acoustic behavior at a few GPa has not been reported hitherto.

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Principle Applications Procedure Materials

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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