Repairable Arrays of the aligned Cylindrical Microdomains from Block Copolymers Enabled by Photoplastic and Photodielectric Effects
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In this study, we investigate a trans-cis isomerization in cylinder-forming polydimethylsiloxane-b-poly((4(phenyldiazenyl)phenoxy)hexyl acrylate) (PDMS-b-PPHA) film that enables the generation of healable arrays over macroscopic distances. The trans-cis isomerization brings about a significant increase in the dielectric constant and a dramatic decrease in the Tg of the PPHA block. Applying these photoplastic and photodielectric characteristics to an in-plane electric field, near-perfectly aligned cylindrical microdomains from cis-cast PDMS-b-PPHA film are obtained at low temperature of 40 oC. Furthermore, the 300-nm wide scratches on cylindrical arrays in trans-cast PDMS-b-PPHA film can be completely healed at 40 oC upon UV light exposure and sequential electric-field application.