By Kojima M.
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Additional info for Photochemistry in Zeolite Nanocavities
Kim, D. , and Choi, S. G. (2002) Effect of soil texture on surfactant-based remediation of hydrophobic organiccontaminated soil, Environ. , 27, 681–688. , and Torres, L. G. (2004) In situ flushing of contaminated soils from a refinery: organic compounds and metal removals, Wiley Interscience, Remediation Spring, 141–152.  Kile, D. E, and Chiou, C. T. (1989) Water solubility enhancement of DDT and trichlorobenzene by some surfactants below and above the critical micelle concentration, Environ.
Reprinted from J. Hazard. , B 98, Kim, J. , Shim, S. , and Shim, J. , Effect of amphiphilic polyurethane nanoparticles on sorption-desorption of phenanthrene in aquifer material, 145–160, Copyright (2003), with permission from Elsevier. As UAN chains have much higher molecular weight of hydrophobic segments, their hydrophobic segments have much stronger hydrophobic interactions compared with those of surfactant molecules, which makes UAN chains insoluble in water even at extremely low concentration in water.
When this cross-linking polymerization takes place in UAA nanoparticles dispersed in water, micellelike structure of UAA nanoparticles is permanently locked-in and amphiphilic oligomer nanoparticles are converted into amphiphilic cross-linked polymer (ACP) nanoparticles dispersed in water. Cross-linking polymerization of UAA nanoparticles dispersed in water can be carried out using conventional emulsion polymerization process. Water-soluble initiator, potassium persulfate (KPS) dissolved in UAA aqueous colloid solution, forms radicals in aqueous phase, and then radicals penetrate into UAA nanoparticles to initiate radical cross-linking polymerization.