Abstract
Laser thermal annealing of PS-<i>b</i>-PMMA is shown to modify phase segregation within the milliseconds timeframe at temperatures from the glass transition to far above the order-disorder transition temperature. We report the kinetics of phase segregation of cylinder forming PS-<i>b</i>-PMMA (53.8 kg/mol, f<sub>PS</sub> = 0.7) as probed by micro-beam grazing incidence small angle X-ray scattering. Structure evolution was probed as a function of peak temperature, time at temperature, and quench rate, with phase segregation readily occurring on millisecond time scales and at peak quench rates up to 10<sup>7</sup> K/s. The final film morphology is dependent on both the anneal time and the quench rate to ambient. With heating to sufficiently high temperatures, the thermal history is erased yielding a final state is purely dependent on the quench rate.
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