title: Surface activity of myristic acid in the poly(methyl methacrylate)/supercritical carbon dioxide system.
abstract: To confirm the surface activity of myristic acid in the dispersion polymerization of vinyl monomers in scCO2, the interfacial tension (IFT) at the polymer/supercritical carbon dioxide (scCO2) interface has been measured. For the IFT measurements, a high-pressure pendant drop apparatus was constructed. The IFT data was obtained by the axisymmetric drop shape analysis of melt polymer droplets formed at the tip of a capillary. The reliability of the apparatus was confirmed by measuring the IFT of polystyrene (PS)/scCO2 and polypropylene (PP)/CO2 systems. The IFT of the poly(methyl methacrylate) (PMMA)/scCO2 system with and without myristic acid was also measured. The IFT decreased on addition of myristic acid. The magnitude of the IFT depression due to the myristic acid was comparable to that of PS/scCO2 systems with the block copolymer surfactant, PS-b-poly(fluorooctyl acrylate). The surface activity of the myristic acid was confirmed by the decrease of IFT.
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Nanotechnology Research Institute, Higashi 1-1-1, Tsukuba Central 5, Tsukuba, Ibaraki 305-8565, Japan. katsuto-otake@aist.go.jp
authors.forename: Katsuto
authors.initials: K
authors.lastname: Otake
authors.forename: Masanori
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Ozaki
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yoda
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Takebayashi
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Sugeta
authors.forename: Noriaki
authors.initials: N
authors.lastname: Nakazawa
authors.forename: Hideki
authors.initials: H
authors.lastname: Sakai
authors.forename: Masahiko
authors.initials: M
authors.lastname: Abe