Thermal degradation of poly(phenylene oxides)

Abstract

SynopsisThe thermal degradation in vacuum of a number of halogenated poly(pheny1ene oxide) polymers has been studied by a weight loss method. In general the thermal stability decreased as the degree of substitution in the phenylene nuclei increased. The chloro derivatives were relatively more stable than the corresponding bromo derivatives. The majority of the polymers showed an initial rapid loss in weight followed by the formation of a highly stable residue. The good thermal stability of the simpler poly(pheny1ene oxides), coupled with their fusibility and solubility, indicate that they may be useful starting products for the preparation of practical materials.

Thermal degradation of polymers with aromatic rings in the chain

“…This behavior has been observed previously for polyacrylonitrile,'O copolymers of perfluorocyclohexa-173-diene and b~tadiene,~ and poly(pheny1ene oxides). 5 It is possible with the polymers under consideration that breakdown resulted in the formation of fused ring structures. The second group of polymers was characterized by a much more gradual loss in weight, although even with these, stabilization sometimes occurred at high weight loss values.…”

Rapid atomic absorption determination of silver and copper by sequential atomization from a graphite rod

“…The tetrachloroterephthaloyl nucleus was chosen as the basic structural unit because of its potential participation in type charge transfer interaction (3, 5, 6) with aromatics and olefins, the tendency for formation of linear, and therefore controlled, structures with para isomers (7,8), and the relative thermal and chemical stability (9)(10)(11) of the tetrahalogenated aromatic nucleus. The non-selective intermolecular void volume of simple dialkyl tetrachloroterephthalates (3) was reduced by employing oligomers, thus increasing the concentration of the selective tetrahalogenated nuclei per unit volume (I, 2).…”

Molecular design. Tetrachloroterephthaloyl oligomers as liquid phases for gas chromatography

“…The tetrachloroterephthaloyl nucleus was chosen as the basic structural unit because of its potential participation in type charge transfer interaction (3, 5, 6) with aromatics and olefins, the tendency for formation of linear, and therefore controlled, structures with para isomers (7,8), and the relative thermal and chemical stability (9)(10)(11) of the tetrahalogenated aromatic nucleus. The non-selective intermolecular void volume of simple dialkyl tetrachloroterephthalates (3) was reduced by employing oligomers, thus increasing the concentration of the selective tetrahalogenated nuclei per unit volume (I, 2).…”