RADIATION PREPARATION OF THE WATER-SOLUBLE, TEMPERATURE-SENSITIVE POLYMERS IN ORGANIC-SOLVENTS

In this work,a water-soluble,temperature sensitive linear polymer,poly N-isopropylacrlylamide(poly-NIPAAm) was synthesized by means of gamma radiation induced polymerization in mixed solvent of water-tetrahydrof uran(THF) and several organic solvents. When mixed solvent of H2O-THF was used, with the increasement of the content of H2O in the mixed sol vent,especially from 60% to 100%,the molecular weight of polyNIPAAm co uld be raised from ten thousand to nearly one million. Besides THF, so me other organic solvents such as methanol, ethanol, dichloromethane, chloroform, tetrachloromethane, acetone, methylisobutylketone(MIBK) an d 1,4-dioxane were used. Then the white power product of polyNIPAAm wi th different molecular weight can be synthesized. PolyNIPAAm synthesiz ed in this work was tried to use in concentration of metal ions in aqu eoes solution. Concentration effect of Au3+ was obviously. It has no t angible proofs for UO22+ with large ion radius, but for the U4+ and so me rare-earth ions, the concentration effects were obtained in differe nt degrees.