肉豆蔻酸在聚甲基丙烯酸甲酯/超临界二氧化碳体系中的表面活性
Surface activity of myristic acid in the poly(methyl methacrylate)/supercritical carbon dioxide system.
作者信息
Otake Katsuto, Kobayashi Masanori, Ozaki Yoshinobu, Yoda Satoshi, Takebayashi Yoshihiro, Sugeta Tsutomu, Nakazawa Noriaki, Sakai Hideki, Abe Masahiko
机构信息
National Institute of Advanced Industrial Science and Technology, Nanotechnology Research Institute, Higashi 1-1-1, Tsukuba Central 5, Tsukuba, Ibaraki 305-8565, Japan.
出版信息
Langmuir. 2004 Jul 20;20(15):6182-6. doi: 10.1021/la0363783.
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.
为了证实肉豆蔻酸在超临界二氧化碳中乙烯基单体分散聚合反应中的表面活性，已对聚合物/超临界二氧化碳（scCO2）界面处的界面张力（IFT）进行了测量。对于IFT测量，构建了一台高压悬滴装置。IFT数据是通过对在毛细管尖端形成的熔融聚合物液滴进行轴对称滴形分析获得的。通过测量聚苯乙烯（PS）/scCO2和聚丙烯（PP）/CO2体系的IFT，证实了该装置的可靠性。还测量了添加和未添加肉豆蔻酸的聚甲基丙烯酸甲酯（PMMA）/scCO2体系的IFT。添加肉豆蔻酸后IFT降低。肉豆蔻酸引起的IFT降低幅度与含有嵌段共聚物表面活性剂PS-b-聚（丙烯酸氟辛酯）的PS/scCO2体系相当。IFT的降低证实了肉豆蔻酸的表面活性。
Zotero 插件