Shell core ion exchange resins - Purolite

Table 15: Reversible swellingShell/Radius Ratio %Swelling1.0 std.70.6460.4612. Shell-core resin resists accelerated oxidation 1 using 6% H 2 O 2 and 1000 ppm Fe +3 ,as a catalyst. The loss in resin solids and dry weight are equated with ion exchange resindecrosslinking that occurs naturally in commercial use (Table 16).Table 16: Accelerated oxidationShell/RadiusRatio% Resin SolidsLost% Resin DryWeight Loss1.0 std.0.725.92.9713. Acid-base cycling stability 1 increases with lower S/R ratio Table 17.Table 17: Accelerated acid/base stabilityShell/Radius Ratio % Loss of Perfect Beads1.0 std.0 to 50.730 to 10.4004. Crush resistance 1 increases with lower S/R ratio (Table 18).Table 18: Crush resistanceShell/Radius Ratio Average Breakpoint,g/bead0.972930.792900.733220.603785. The size uniformity of copolymer beads increases (lower UC) with initial shellsulfonation to a point where the S/R ratio is about 0.5, after which the uniformity decreasesagain when proceeding onward towards full functionalization (S/R ratio = 1).12