Cover Image, Volume 52, Issue 7



Solution-state thermal properties of the poly(ethylene oxide-b-NIPAAm) copolymer with a C12 end-cap can be modified via the addition of salts at concentrations as low as 1 mM, as shown by Ian M. Henderson et al. on page 507. The aggregation temperature can be slightly raised or lowered, depending on the position of the salt in the Hoffmeister series. In addition to aggregation temperature changes, evidence of thermohysteresis is found upon the addition of salts to samples that are repeatedly thermally cycled. The concentration of the polymer, the presence of acids, and the C12 end group are also demonstrated to be methods by which the thermal behavior can be modified.