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Polymerization of acrylamide and methylmethacrylate at the surface of submicron polypyrrole particles
Author(s) -
Degobert Patrick,
Henry François
Publication year - 1995
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1995.220060516
Subject(s) - polypyrrole , potassium persulfate , materials science , polymerization , emulsion polymerization , chemical engineering , cyclic voltammetry , polymer , dynamic light scattering , radical polymerization , conductive polymer , scanning electron microscope , polymer chemistry , composite material , electrode , nanotechnology , nanoparticle , electrochemistry , chemistry , engineering
This paper presents two methods of encapsulation of polypyrrole latex particles of different sizes by an insulating polymer. The first method concerns the encapsulation by inverse emulsion polymerization of acrylamide with crosslinking agent. That method is effective for the smallest particles (about 100 nm). The second method concerns encapsulation by direct emulsion polymerization of methylmethacrylate. Inhibition of polymerization occurs if potassium persulfate is used as the initiator, whereas no inhibition is observed with 4,4′ azobis 4‐cyanopentanoic acid as the initiator. These results are explained in terms of the ion‐exchange capacity of conducting polymers. This second method seems to be effective for all the sizes of polypyrrole particles. These encapsulated particles have been characterized by transmission electron microscopy, scanning electron microscopy, quasi elastic light scattering, cyclic voltametry and electrophoresis. Cyclic voltammetry recently developed on aqueous suspensions of polypyrrole particles was revealed to be the best technique because of its simplicity and speed.