Sorption and transport of inert gases in PVF₂/PMMA blends

Abstract

synopsisSorption and transport of several inert gases (He, Ar, N2, and CH,) in miscible blends of PMMA and PVFz are reported as a function of pressure at 35°C. For each gas, the permeabilities are independent of pressure for all blend compositions. Sorption isotherms are linear for rubbery compositions (PVFz-rich) and nonlinear for glassy compositions (PMMA-rich) as expected. In contrast to COz, these gases do not plasticize any of these materials. The data are analyzed using-appropriate models for sorption and transport, and the parameters are correlated in terms of blend composition and molecular characteristics of the gases. Effects of crystallinity are discussed. Sorption behavior is compared with poly(methy1 acrylate) and poly(viny1 acetate).

Water sorption and transport in blends of poly (vinyl pyrrolidone) and polysulfone

“…18 These data were used to calculate diffusion coefficients via eq. (2). Figure 13b shows corresponding data for a 20% PVP blend for activity intervals of 40-50% and 80-90%.…”

“…The relationship between gas investigated by Tsang et al 12 Sorption and transport of water in miscible blends of polyethersultransport properties and blend composition has been examined for several miscible polymer fone and phenoxy have been reported by Swinyard et al, 13 while Singh et al, 14 studied the sorption blends. [1][2][3][4][5][6][7][8][9][10] A few articles have examined water sorption and transport behavior of miscible polyof water in homogeneous polyethersulfone/poly (ethylene oxide) blends. mer blends.…”

Effect of tacticity on permeation properties of poly(methyl methacrylate)

“…(5) to sorption data.32. 33 The apparent solubility coefficients shown in Table I1 correlate with the Lennard-Jones potential well depth, c / k , of the gas as shown for the three homopolymers in Figure 4 and as expected from previous ~t u d i e s .~~~~~ The apparent diffusion coefficients are related to gas molecular size in a manner similar to that found in other c a~e s .~, ~~ It is interesting to note that the apparent diffusion coefficients for i-PMMA are roughly one-half those for s-PMMA for all gases. The apparent solubility coefficients for i-PMMA are of the order of one-third of those for s-PMMA.…”

Styrene–butadiene rubber/natural rubber blends: Morphology, transport behavior, and dynamic mechanical and mechanical properties

“…The blends may be heterogeneous or homogeneous. In homogeneous blends, the permeability is affected by the interaction between the component polymers, [1][2][3] while for heterogeneous blends, interfacial phenomena and the rubbery or glassy nature of the phases are important. 4 Cabasso et al 5 studied the diffusion of benzene-cyclohexane mixtures through polymer blends composed of polyphosphonates and acetyl cellulose.…”