Photo-controlled alignment and helical organization in main-chain liquid crystalline alternating polymers

Hirotoshi Sakaino, Brigitte A.G. Lamers, Stefan C.J. Meskers, E.W. Meijer, Ghislaine Vantomme (Corresponding author)

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10 Citations (Scopus)
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Abstract

Materials with highly ordered nanoscale structures can translate molecular processes to macroscopic function. Here we report on the photo-controlled organization of achiral alternating copolymers composed of discrete length blocks showing well-defined sub-10 nm morphologies. These alternating copolymers consist of main-chain azobenzene building blocks alternating with discrete oDMS blocks of various precise lengths. Remarkably, we demonstrate the imprinting of a stable helical molecular arrangement in spin-casted thin films by irradiation with circularly polarized light, without chiral dopant or plasticizer required. By following the out-of-equilibrium photo-switching process over irradiation time, the mechanism of molecular reorganization is unraveled and rationalized with the nature of the morphology. Linear photo-organization is preferentially reached with flexible and symmetric cylindrical structures while helical photo-organization is most easily obtained with robust but rotatable lamella structures. These findings suggest that precision in the synthesis and assembly of alternating copolymers can lead to complete control over molecular organization and main-chain motion.

Original languageEnglish
Pages (from-to)1131-1141
Number of pages11
JournalJournal of Polymer Science
Volume59
Issue number12
DOIs
Publication statusPublished - 15 Jun 2021

Funding

The authors would like to thank Prof. Dick J. Broer for fruitful discussions, and Bas de Waal for synthesis of DMSs. The authors are thankful for the financial support from Toray Industries Inc. and from the Royal Netherlands Academy of Arts and Sciences and the Dutch Ministry of Education, Culture and Science (Gravity program 024.001.035) and NWO‐VENI Grant 722.017.003. o

FundersFunder number
NWO‐VENI
NWO‐VENI722.017.003
Koninklijke Nederlandse Akademie van Wetenschappen
Ministerie van Onderwijs, Cultuur en Wetenschap024.001.035
Toray Industries

    Keywords

    • azobenzene
    • discrete oligomers
    • liquid crystalline copolymer
    • oligodimethylsiloxane
    • photo-alignment

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