Studying Polymer Confinement Using Positron Annihilation Lifetime Spectroscopy

Presentation Type

Poster/Portfolio

Presenter Major(s)

Physics

Mentor Information

Richard Vallery

Department

Physics

Location

Kirkhof Center KC37

Start Date

11-4-2012 9:00 AM

Keywords

Physical Science

Abstract

Polymer surface interactions are studied within the polymer nanocomposite (PNC) system of silica nanoparticles immersed in an epoxy matrix composed of diglycidyl ether of bisphenol A (DGEBA) with a 4,4'-diaminodiphenyl sulfone (DDS) hardener using positronium annihilation lifetime spectroscopy (PALS). This method offers a unique perspective because positronium localizes within the pores of the material, allowing for a measurement sensitive to the polymer free volume and not to the nanoparticles immersed within. PALS measurements determine free volume over a range of temperatures, which are used to relate the glass transition temperature to the loading weight fraction of nanoparticles.

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Apr 11th, 9:00 AM

Studying Polymer Confinement Using Positron Annihilation Lifetime Spectroscopy

Kirkhof Center KC37

Polymer surface interactions are studied within the polymer nanocomposite (PNC) system of silica nanoparticles immersed in an epoxy matrix composed of diglycidyl ether of bisphenol A (DGEBA) with a 4,4'-diaminodiphenyl sulfone (DDS) hardener using positronium annihilation lifetime spectroscopy (PALS). This method offers a unique perspective because positronium localizes within the pores of the material, allowing for a measurement sensitive to the polymer free volume and not to the nanoparticles immersed within. PALS measurements determine free volume over a range of temperatures, which are used to relate the glass transition temperature to the loading weight fraction of nanoparticles.