Long-period parallel lamellar morphologies for block copolymers (BCP) require long thermal annealing (TA) times or sensitive equipment for control. Direct immersion annealing (DIA) rapidly produces parallel microstructure but with smaller domains. We studied the transition between ordered states obtained by TA and DIA to understand the dynamics of the process, analyzed in terms of chain swelling, diffusion, and in-plane vs. out-of-plane interfacial evolution. We propose an alternate processing route for accelerated BCP assembly with large lamellar domain sizes. In addition, we report a transition morphology between the two lamellar states with characteristics of high surface roughness and surface area.
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