Free Volumes in Polymer Nanocomposites

Hong Min  Chen; L. James Lee; Jin Tao Yang; Xiao Hong Gu; Yan Ching Jean

doi:10.4028/www.scientific.net/MSF.607.177

Paper Titles

Spontaneous Emission of Positronium Negative Ions from Tungsten (100) Surface
p.161

Temperature and Pressure Measurements of PALS Spectra in Photonic Glasses
p.166

Positron Lifetime Spectroscopy on Controlled Pore Glass Porosimetry and Pore Size Distribution
p.169

Monitoring the Crystallization Stages of Silicalite by Positron Lifetime Spectroscopy
p.173

Free Volumes in Polymer Nanocomposites
p.177

n-Nonadecane Embedded in Mesopores
p.180

Investigation of Interfacial Interaction and Microstructure for Epoxy/CNTs Nanocomposites by PALS
p.183

Positron Study of Carbon Black Parameters: Structure and Surface Area
p.186

Open-Nano Pores in Natural Minerals Studied by Positron Lifetime Spectroscopy
p.189

HomeMaterials Science ForumMaterials Science Forum Vol. 607Free Volumes in Polymer Nanocomposites

Free Volumes in Polymer Nanocomposites

Abstract:

We have employed positron annihilation lifetime spectroscopy to measure the free volumes in nanocomposites of polystyrene with addition of carbon nanofiber (CNF) and carbon dioxide as a function of composition and of temperature. We found that the glass transition temperature (Tg) increases as a function of CNF compositions but significantly decreases as the exposure of CO2. We also investigate the combination effect of CNF and CO2 and found that the CO2 significantly weakens the bonding between PS and CNF interfaces. The Tg changes are compared with DSC.