| 摘要 |
1277187 Etherified styrene polymers FORD MOTOR CO 25 Feb 1970 [25 Feb 1969] 9163/70 Heading C3P Cross-linkable polymers have, attached to their backbone, thermally labile pendant phenylene quinol ether groups which groups are preferably of the formula The polymer is preferably a styrene polymer, the phenylene quinol ether groups being derived from the pendant phenyl groups of the styrene polymer which are substituted by quinoxy groups, as in the formula. The groups may be introduced by reacting, for example a phenyl ether of a quinol, with a polymer containing pendant hydroxy phenyl groups. In the examples styrene and 3-acetoxy styrene are copolymerized in bulk using azobis-isobutyronitrile, the acetoxy groups are then hydrolysed to produce hydroxyl groups using NaOH in a dioxane and water mixture, and then the hydroxy groups were reacted with 2,4,6-tri-t.-butyl quinoxy radicals in benzene, to give a styrene polymer whose phenyl groups are substituted by quinol ether groups. The polymer cross-links thermally due to the dissociation of the ether groups to produce phenoxy radical pendant groups. |
