Free volume quantities and viscoelasticity of polymer glasses

Local Free‐Volume Distribution from PALS and Dynamics of Polymers

“…The same has frequently been observed for viscosity and dielectric α-relaxation in small-molecule liquids [Thosar et al, 1973;Malhotra and Pethrick, 1983;Higuchi et al, 1996;Pethrick, 1997;Kanaya et al, 1999;Bartoš et al, , 2001Bartoš et al, , 2002Bartoš et al, , 2009]. However, this is usually not the case for structural mobility (segmental relaxations, viscosity) in polymers [Dlubek et al, 2005b[Dlubek et al, , 2007bKilburn et al, 2006a].…”

Mobility and solubility of antioxidants and oxygen in glassy polymers. I. Concentration and temperature dependence of antioxidant sorption

“…The positron annihilation experiments on glassy polycarbonate were used to estimate the values for K /γ. Taking the average value of data found in ten publications, 43–52 a value of 2.5 ×10 −4 cm 3 g −1 K −1 was obtained for K /γ.…”

Polymer Interphase Materials by Forced Assembly

“…Positron annihilation lifetime spectroscopy (PALS) is a powerful probe of free volume structure at the molecular scale. − Examination of the constituent polymers reveals that free volume hole size varies from 2.52 Å for PETG to 2.85 Å for PS (Table ). Films with discrete layers possess a mean hole radius r d that is close to the additive value based on the constituents (Table ).…”

“…Positron annihilation lifetime spectroscopy (PALS) is a powerful probe of free volume structure at the molecular scale. [28][29][30][31] Examination of the constituent polymers reveals that free volume hole size varies from 2.52 Å for PETG to 2.85 Å for PS (Table 1). Films with discrete layers possess a mean hole radius r d that is close to the additive value based on the constituents (Table 2).…”