IMPROVED METHOD FOR RADIATION GRAFT COPOLYMERIZATION OF N-VINYL LACTAM MONOMERS ON ACRYLONITRILE POLYMER SUBSTRATES

Patent · Mon Aug 01 00:00:00 EDT 1960

OSTI ID:4143689

A method is described for improving the dye-receptivity of acrylonitrile polymers by radioinduced graft copolymer ization in contact with a N-vinyl lactam monomer. prefer ably N-vinyl pyrrolidonc. The method consists of prepar the acrylonitrile polymer in aquagel form, impregnating with a minor proportion (< 20%) of N-vinyl pyrrolidone in with a minor proportion (<20%) oi N-vinyi pyrrolidone an the form of an aqueous solution, and exposing the impregnated aquagel to high-energy radiation at doses of 10/sup 4/ to 2 x 10/sup 5/ rep at 20 to 60 C. ln order to reduce radioinduced production of O/sub 2/ and H/sub 2/O/ sub 2/ in H/sub 2/O, the aqueous solution of the monomer should be kept at a pH of 7 to 10. A wetti agent, Na/sub 3/PO/sub 4/, is usually added. Experiments were performed which show the effects of dose, monomer concentration. and temperature on dye-receptivity of graft copolymers prepared in the above manner. Another experiment shows the effects on dye-receptivity of various additives (NaHSO/sub 3/. Na/sub 2/SO/sub 4/, Na/sub 2/S. NaNO/sub 3/, Na/sub 3/P0/sub 4/, NaCI, ZnSO/sub 4/, Na/sub 2/SO/sub 3/, and SnCl/sub 4/), of which NaHSO/sub 3/ and Na/sub 2/S were found to prevent dye-receptivity. Solvents other than H/sub 2/O which may be used to prepare monomer solutions for impregnating the acrylonitrile polymer aquagel and dyestuffs which may be used to dye the graft copolymers are given. . (D.L.C.)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-14-024181
• OSTI ID: 4143689
• Report Number(s): GB 843063
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-60
• Country of Publication: United Kingdom
• Language: English

Related Subjects

CHEMISTRY
ACIDITY
ACRYLIC ACID
AMIDES
CHEMICAL REACTIONS
CONFIGURATION
CYANIDES
DYES
HYDROGEN PEROXIDES
LACTAMS
NITRILES
ORGANIC COMPOUNDS
OXYGEN
POLYMERIZATION
PRODUCTION
QUANTITY RATIO
RADIATION DOSES
RADIATION EFFECTS
SODIUM CHLORIDES
SODIUM NITRATES
SODIUM PHOSPHATES
SODIUM SULFATES
SODIUM SULFIDES
SOLUTIONS
SOLVENTS
TEMPERATURE
VINYL RADICALS
WATER
ZINC SULFATES