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This work establishes the fact that Polyaniline (PANI) contributes to cationic scavenging on the polymerization of a cross linking polymer, i.e. Divinylbenzene (DVB), resulting in a significant change in the properties of the PANI-based DVB resin system. Furthermore, it is also shown that the cationic scavenging is directly related to the degree of doping of PANI and its dispersion state. Various...
In this paper, solid-state poly(methyl methacrylate) (PMMA) nanofoams are fabricated via a low-temperature CO2 saturation process. Nanofoams with smallest cell size in 30–40 nm range and cell nucleation densities exceeding 1014 cells/cm3 are achieved. We investigated the effect of saturation temperature on the solid-state foaming of PMMA and resulting morphologies of the foams in the range of −30 °C...
In this paper, we report on the solubility and diffusivity of CO2 in PMMA in the range −30 °C to 100 °C, and on the depression in the glass transition temperature when the polymer acquires an equilibrium mass% of CO2 in this temperature range. Solubility of CO2 in PMMA increases ten-fold from 3.9% at 100 °C to 39.3% at −30 °C. We observe a drop in ΔHs, the heat of sorption, at the transition of CO...
In this paper, we describe a novel process for creating polycarbonate (PC) nanofoams with cells in the range of 20–30 nm that is based on saturating PC in liquid CO 2 . We investigated the effect of saturation temperature on the solid-state processing of PC foams in the range of −30 °C to 80 °C. Saturation temperature significantly affects the solubility and diffusivity, and the Arrhenius...
Microcellular foams, closed-cell polymer foams with cells of order 10 μm, have been studied for over two decades. These foams have shown significant improvements in mechanical properties, such as strength-to-weight ratio, over conventional foams with cells on the order of 1 mm. Will an additional 100-fold reduction in cell size yield further improvement in properties? Here we answer this question...
In this study we investigate the solid-state batch foaming of polyetherimide (PEI) using sub-critical CO 2 as a blowing agent. We report on the gas diffusion for various saturation pressures in this system. Foaming process characterization is reported detailing conditions used to create microcellular and nanocellular PEI foams of 40% and higher relative density. Gas sorption, foaming, and...
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