Synthesis of monodisperse poly(divinylbenzene) microspheres
Tóm tắt
Highly crosslinked monodisperse poly(divinylbenzene) microspheres were produced by precipitation polymerization with acetonitrile as solvent. The radical initiators AIBN, BPO, and ADVN were used. The process does not require stabilizers of any type, and produces monodisperse particles with diameters between 2 and 5 μm, depending on the conditions. These microspheres do not swell or dissolve in any common solvent, and have clean, stabilizer‐free surfaces. The particle formation and growth mechanism is proposed to resemble that of dispersion polymerization, except that the particles are stabilized against coagulation by their rigid, crosslinked surfaces rather than by added stabilizers. Spherical particles were formed only at effective crosslinker/monomer or divinyl/monovinyl ratios larger than 1 : 2. © 1993 John Wiley & Sons, Inc.
Từ khóa
Tài liệu tham khảo
Li K., 1992, Preparation and Characterization of Highly Crosslinked Polymer Particles from Commercial Divinylbenzene
M.Hattori E. D.Sudol andM. S.El‐Aasser Highly Crosslinked Polymer Particles by Dispersion Polymerization 34th IUPAC International Symposium on Macromolecules Prague July 13–18 1992.
4‐Methylstyrene without any divinylbenzene can be polymerized to form spherical particles but requires polymeric stabilizers such as polyvinylpyrrolidone. This falls in the area of dispersion polymerization.
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Riddick J. A., 1986, Organic Solvents—Physical Properties and Methods of Purification