New fluorene-based chiral copolymers with unusually high optical activity in pristine and annealed thin films

Min Ju Cho, Jong Soo Ahn, Young Un Kim, Hyun Ah Um, Paras N. Prasad, Geon Joon Lee, Dong Hoon Choi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Polyfluorene (PF)-based chiral alternating copolymers, i.e., PFPh and PFTh, were successfully synthesized to obtain high circular dichroism (CD) in pristine thin films. By tethering chiral side-chains to the fluorene moiety, the resultant PFPh and PFTh films intriguingly exhibited high CD even in pristine films, which was attributed to the relatively low steric hindrance between the repeating units and intermolecular interactions between the polymer chains. Compared to PFTh bearing a five-membered heteroaromatic thiophene monomer, PFPh containing a six-membered aromatic benzene monomer, showed significantly enhanced CD in an annealed film. Of particular importance, results of optical microscopy and atomic force microscopy can be used to assess the CD of a chiral polymer thin film after thermal annealing.

Original languageEnglish
Pages (from-to)23879-23886
Number of pages8
JournalRSC Advances
Volume6
Issue number28
DOIs
Publication statusPublished - 2016

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

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