Abstract
We report a method for the coacervation micro-encapsulation of several forms of CaCO3 microparticles with the fluoropolymer poly(heptadecafluorodecyl acrylate) (poly (HDFDA)) by pressure-induced phase separation of a supercritical CO2 solution. A suspension of CaCO3 in CO2 and dissolved poly(HDFDA) were mixed in supercritical CO2. After the system pressure was slowly decreased to atmospheric pressure, the microcapsules were obtained. Coacervation was achieved by the precipitation of poly(HDFDA) during the decrease in the pressure of CO2; the solubility of poly(HDFDA) in CO2 decreased with the pressure. The structure and morphology of the microparticles were investigated by using a scanning electron microscope (SEM) and an electron probe microanalyzer (EPMA) equipped with a wavelength dispersive X-ray spectroscope (WDX).
Highlights
Polymer microcapsules containing inorganic materials are attracting much attention as the field of supercritical CO2 technology
We report a method for the coacervation micro-encapsulation of several forms of CaCO3 microparticles with the fluoropolymer poly(heptadecafluorodecyl acrylate) (poly (HDFDA)) by pressure-induced phase separation of a supercritical CO2 solution
An electron probe microanalyzer (EPMA) equipped with wavelength dispersive X-ray spectroscope (WDX) can identify elements through the use of a crystal monochromator to select X-rays of a particular wavelength
Summary
Polymer microcapsules containing inorganic materials are attracting much attention as the field of supercritical CO2 (scCO2) technology. Many investigators have attempted the formation of polymer microcapsules using scCO2 [1,2,3,4,5,6]. Rapid expansion from supercritical solutions (RESS) is a well-known process, and a variety of polymer microcapsules have been produced with the help of this process by many investigators [2,3,5,6,7,8,9]. RESS of fluoropolymers such as perfluoropolyether, poly(1,1,2,2-tetrahydroperfluorodecyl acrylate), and poly (heptadeca-fluorodecyl acrylate), which are highly soluble in CO2 at temperatures near the ambient temperature, produces coating materials [10,11,12] and submicron to several micron-sized particles and fibers [12,13]
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