| 摘要 |
1,184,451. Graft polymers. RADIATION RESEARCH CORP. 8 March, 1967 [11 March, 1966; 1 July, 1966], No. 10934/67. Heading C3G. [Also in Division H1] A polymerization reaction with a polymeric substrate is initiated by subjecting the substrate to a spark discharge in a zone of free radical initiating gas to generate free radical sites on the surface of the substrate. The activated substrate is then reacted with an organic substance containing carbon-carbon unsaturation, either directly or after being first exposed to oxygen or an oxygen-bearing gas. The subjection to spark discharges of films of polypropylene, polyester, fluorocarbon, polytetrafluorethylene and polyethylene and of cotton, polyester, nylon, polypropylene and cottonpolyester fabrics is described, the treated substrates being grafted with acrylic or methacrylic acid or vinyl pyrrolidone and dyed. The initiating gases used are A, Me, M 2 , N 2 , O 2 , air and mixtures thereof. Both surfaces of the film may be subjected to a spark discharge by employing an apparatus comprising two discharge zones. The graft monomer is in gaseous or liquid form. The substrate may also be in the form of a shaped article or yarn and other substrates specified are wood, wool, rayon, polyacrylonitrile, polyvinyl chloride, polymonochlorotrifluoroethylene and elastomers. When the graft monomer is acrylic acid, the graft polymer may be converted to salt form and a vinyl acetate graft polymer may be hydrolysed and cross-linked with formaldehyde. Other graft monomers specified are styrene, vinylidene chloride, acrylonitrile and isoprene. |
