Halogenated polystyrenes, chemical

Chemical Modification of Halogenated Polystyrenes Using Rieke Calcium or Rieke Copper... 

Phosphorus Phosphate esters and others (halogenated and nonhalogenated) Polyurethane foams, polyesters, and thermoplastics such as flexible PVC, modified PPO, and cellulosics Also polyethylene, polypropylene, polystyrene, and ethylene/propylene copolymers Akzo Nobel, Albemarle, Amfine Chemical Corp., Amspec Chemical, Bayer, Ciba Specialty Chemical-Melapur, Clariant, Cytec, Daihachi Chemical Industry, Great Lakes, Italmatch Chemicals, Nitroil, Rhodia... 

Antimony oxide Dusting and Nondusting grades are available of various particle sizes Works synergistically with reactive or additive halogenated compounds ABS, polyethylene, polypropylene, polystyrene, thermoplastic polyester, unsaturated polyesters Asarco Inc. Harwich Chemical Corp. US Antimony Sales Corp. 

Polystyrene is resistant to hot and cold water, weak acids and bases, aqueous solutions of inorganic salts, amines, alcohols, fats, and oils. Polystyrene is not resistant to oxidizing acids, halogens, aliphatic and chlorinated (saturated and unsaturated) hydrocarbons, esters, ketones, ethers, aldehydes, and aromatic hydrocarbons [86]. Table A. 14 Appendix compiles the chemical resistance of polystyrene and styrene copolymers. 

The benzene nucleus in polystyrene undergoes normal aromatic reactions and thus the polymer may be, for example, alkylated, halogenated, nitrated and sulphonated. A frequent practical difficulty in carrying out such reactions is one of finding a reaction medium in which the polymer is soluble also, chain scission, cross-linking and discoloration often accompany these reactions. Chemically-modified polystyrenes have found little commercial application but sulphonated styrene-divinylbenzene copolymers (which are cross-linked) find use as cationic exchange resins the nature of such resins is illustrated by the following strueture ... 

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