Preparation and characterization of core–shell polystyrene–polydimethylsiloxane particles by seeded polymerization

Abstract

Nanometer scale particles of seed latex were successfully prepared by polymerization induced by gamma rays. By modification of the coupling agent 3‐methacryloxylpropyltrimethoxylsilane (MPS) at the surface of polystyrene (PSt) particles, polydimethylsiloxane (PDMS) was introduced outside the PSt particles and composite latex particles with a core–shell (PSt–PDMS) structure were successfully prepared. Because of the chemical bond linkage between the core and the shell, such a structure is stable. Direct evidence of the core–shell structure was observed by transmission electron microscopy (TEM). In addition the chemical bond linkage was confirmed by Fourier‐transfer infrared (FT‐IR) spectroscopy. An indirect proof of the core–shell structure was given by water absorption ratio determination of the different samples. Copyright © 2004 Society of Chemical Industry

Synthesis and properties of styrene–butylacrylate emulsion copolymers modified by silane compounds

“…Modification of polyacrylates or poly(acrylates‐ co ‐styrene) latices by silicone is a convenient and effective way for improving their properties, that is why there is abundant literature about this study, and because of the strong commercial interest a number of works have been appeared as patents 1–6, 10–16. Among these works, three methods were widely used: (a) core‐shell (polysiloxane‐other polymers) composite latex particles were generally prepared by multistage emulsion polymerization typically involving, first, forming the polysiloxane seed particle and, second, polymerizing the second monomers into the polysiloxane seed1–9; (b) copolymerization of vinyl monomers with vinyl silanes or polymerizable polysiloxanes were also investigated10–18; and (c) in recent years, novel core/shell latex particles with polyacrylates or polystyrene as a core and with polysiloxane as a shell were successfully synthesized through a special seeded emulsion polymerization, and the properties of the latices and latex films were also studied 19–23…”

Effect of carboxyl on vulcanization and mechanical properties of carboxylated acrylic rubber prepared by 60Co‐γ‐ray‐induced polymerization

“…It can be carried out at room temperature, under normal pressure, and the reaction is hardly influenced by the variation of temperature. Because there is no chemical initiator in the polymerization process, the final products are not “contaminated.” In aqueous emulsion polymerization, the primary free radicals for initiating the polymerization are generated from water and the monomer by γ irradiation 22…”

Preparation and characterization of polysiloxane–polyacrylates composite latices and their film properties

“…As the modification of polyacrylics lattices by polysiloxanes can be carried out in a convenient and effective way, there have therefore been many reports in the literature concerning polyacylic/polysiloxane composite latices, and due to the strong commercial interest a number of these have appeared as patents 1–6, 10–16. In such work, three preparative methods have mostly been used: (a) core–shell (polysiloxane–‘another polymer’) composite latex particles, generally prepared by multistage emulsion polymerization, typically involving first, forming the polysiloxane seed particle and secondly, polymerizing the second monomer onto the seed;1–9 (b) copolymerization of vinyl monomers with vinyl silanes or polymerizable polysiloxanes;10–18 (c) a recent development using novel core–shell latex particles, with a polyacrylate or polystyrene as the core and a polysiloxane as the shell, successfully synthesized through a special seeded emulsion polymerization reaction—the properties of the latices and latex films prepared in this way were also studied 19–22. In the above studies, however, the effects of the molecular weight of the seed polymer (polysiloxane) and the size of the seed latex particles on the properties of the composite were not investigated.…”