Hydroxy-2-methylpropiophenone ethylene glycol-methacrylate

Figure 1 Schematic representation of the synthesis of defined SPB In the first step, a PS latex is generated, which is then covered by a thin layer of the photoinitiator 2-[p-(2-hydroxy-2-methylpropiophenone)]-ethylene glycol methacrylate (HMEM) in the second step. Photoinitiation in the presence of water-soluble monomers, such as acrylic acid, leads to polyelectrolyte chains grafted onto the surface of the core particles in the third step. Taken with permission from Ballauff, M. Macromol Chem. Phys. 2003, 204, 220. ...

The synthesis of PS core particles by emulsion polymerization and polyelectrolyte brushes by photopolymerization was first reported by Ballauff and co-workers in 1999. Figure 1 displays this route schematically First, nearly monodisperse PS cores are made by conventional emulsion polymerization. Then a thin layer of a suitable photoinitiator is polymerized onto the surface of these cores. The photoinitiator, 2-[p-(2-hydroxy-2-methylpropiophenone)]-ethylene glycol methacrylate... 

Guo et al. [150] described the synthesis and characterization of latex particles consisting of a PS core and a shell of linear PAA chains. In the first step, PS cores were covered by a thin layer of a photoinitiator 2-[p-(2-hydroxy-2-methylpropiophenone)] ethylene glycol-methacrylate (HMEM) by means of a seeded emulsion polymerization process. The polymer formed by HMEM on the surface acted as a photoinitiator in the next step, in which acrylic acid was nsed as a water-soluble monomer. The PAA chains were affixed on the surface by means of an attaching from technique that led to particles with well-defined morphology and narrow size distribntion. 

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