Event Title
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.
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.