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Self‐extinguishing polystyrene foaming‐in‐place beads
Author(s) -
Jahn A. K.,
Vanderhoff J. W.
Publication year - 1964
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1964.070080605
Subject(s) - polystyrene , silicone , polymerization , peroxide , chain transfer , transfer agent , polymer chemistry , suspension polymerization , halogen , chemical engineering , suspension (topology) , materials science , chemistry , foaming agent , radical polymerization , organic chemistry , polymer , alkyl , mathematics , homotopy , pure mathematics , engineering , porosity
The preparation of practical self‐extinguishing polystyrene foaming‐in‐place compositions by suspension polymerization is described. The halogen necessary for self‐extinguishing characteristics is incorporated by chain transfer. The synergistic effect of organic peroxides decreases drastically the amount of halogen necessary. For example, 0.3 pph 1,2‐dibromotetrachloroethane in the presence of 0.2 pph dicumyl peroxide renders the composition self‐extinguishing, while 1.0 pph is necessary without peroxide. The rate of polymerization is unaffected by the presence of this chain transfer agent, while the molecular weight is reduced considerably. The effectiveness of other halogenated chain transfer agents and peroxy compounds has been demonstrated. Silicone mold release agent exerts a deleterious effect on the self‐extinguishing properties.