IMPROVEMENTS IN OR RELATING TO THE GRAFTING OF POLYMERS TO CELLULOSE SUBSTRATES
The efficiency of radiation in graft polymerization of unsaturated monomers on cellulose-base materials (substrates) may be increased by swelling the substrate with a water-soluble, nonpolymerizable swelling agent prior to irradiation. Acids, bases, and salts, as well as water, can be used as swelling agents, and they should be incorporated in the substrate to at least 15%. Irradiation should be carried out to at least 10/sup -3/ watt-sec/cm/sup 2/ with ionizing radiation of an energy at least equivalent to 0.1-Mev electron beam, and application of the monomer to the substrate should take place while the substrate is still active from irradiation. After the graft polymerization, the swelling agent may be removed together with ungrafted monomer by solvent extraction. Four examples of the method are given using NaOH and HCl solutions as swelling agents and vinyl acetate, vinvlidene chloride, and acrylonitrile as monomers. Data on the treatment of cellulosic substrates with a wide variety of monomers are also presented. (D.L.C.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-15-000264
- OSTI ID:
- 4133362
- Report Number(s):
- GB 845690
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-61
- Country of Publication:
- United Kingdom
- Language:
- English
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