detector was used at sample-to-detector distances of 3.6 m. The polymer solution SAXS experiments were performed using a flow cell to prevent beam damage and enable longer exposure times. The flow cell was constructed using a 1 mm diameter quartz capillary connected to PTFE tubing using PTFE heat shrink tubing. One tubing end was connected to a syringe pump which cycled the polymer solution back and forth through the capillary at a linear velocity of about 1 mm/s within the capillary while a series of 0.1 s exposures with 3 s delays were accumulated for a total exposure time of approximately 1-2 s. Each series of 0.1 s exposures were inspected to ensure that there was no beam damage as characterized by a systematic variation in the scattering profiles with time. Each polymer solution and its neat solvent background were scanned successively at the same position of the same flow cell in order to ensure that the instrumental "empty cell" scattering was consistent. Such procedure was necessary due to the weak scattering of our conjugated polymer relative to chlorinated solvent in order to ensure proper background subtraction. The 2D scattering patterns were isotropic indicating that the flow in the 1 mm capillary did not induce alignment of the conjugated polymer materials. The 2D scattering patterns were then reduced, background subtracted, and averaged using the beamline's MATLAB package.