Dynamic mechanical measurements were used to investigate the effect of small molecule additives on the order-to-disorder transitions (ODTs) of Pluronic, poly(ethylene oxide) (PEO)poly(propylene oxide) (PPO)PEO triblock copolymer surfactant melts. The small molecule additives contain multiple functional groups (carboxyl or hydroxyl), which selectively interact with the PEO component of Pluronic via hydrogen bonding, thereby effectively increasing ? of the system and leading to microphase separation in otherwise disordered melts. The ODTs of these Pluronic/small-molecule-additive complexes can be detected by rheology since, upon increasing temperature, crossing the order-to-disorder transition temperature (T-ODT) results in a sharp decrease in the low frequency storage and loss moduli (G' and G", respectively). The crystallization of the PEO component is suppressed with increasing additive loading due to strong hydrogen bond interactions. The T-ODT is strongly composition dependent and increases up to 145 degrees C for 20 wt % loading of a particular additive. T-ODT is also found to vary widely but systematically with the number, position and hydrogen-bond-donating ability of the functional groups of the additive. Upon increasing temperature for high additive loadings, macrophase separation and crystallization of the additives can occur before the ODT is detected.