Synthesis of phosphonate-functionalized polystyrene and poly(methyl methacrylate) particles and their kinetic behavior in miniemulsion polymerization

Phosphonate-functionalized polymer nanoparticles were synthesized by free-radical copolymerization of vinylphosphonic acid (VPA) with styrene or methyl methacrylate (MMA) using the miniemulsion technique. The influence of different parameters such as monomer and surfactant type, amount of vinylphosphonic acid on the average particle size, and size distribution was studied using dynamic light scattering and transmission electron microscopy. Depending on the amount and type of the surfactant used (ionic or non-ionic), phosphonate-functionalized particles in a size range from 102 to 312 nm can be obtained. The density of the phosphonate groups on the particle surface was higher in the case of using MMA as a basis monomer than polystyrene. The kinetic behavior of VPA copolymerization with styrene or MMA using a hydrophobic initiator was investigated by reaction calorimetry. Different kinetic curves were observed for miniemulsion (co)polymerization of styrene- and MMA-based nanoparticles indicating different nucleation mechanisms

Fantasies of the Library

"Fantasies of the Library lets readers experience the library anew. The book imagines, and enacts, the library as both keeper of books and curator of ideas--as a platform of the future. One essay occupies the right-hand page of a two-page spread while interviews scrolls independently on the left. Bibliophilic artworks intersect both throughout the book-as-exhibition. A photo essay, “Reading Rooms Reading Machines” further interrupts the book in order to display images of libraries (old and new, real and imagined), and readers (human and machine) and features work by artists including Kader Atta, Wafaa Bilal, Mark Dion, Rodney Graham, Katie Paterson, Veronika Spierenburg, and others." -- Publisher's website