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  • Title: Control of the optical properties of a star copolymer with a hyperbranched conjugated polymer core and poly(ethylene glycol) arms by self-assembly.
    Author: Qiu F, Tu C, Chen Y, Shi Y, Song L, Wang R, Zhu X, Zhu B, Yan D, Han T.
    Journal: Chemistry; 2010 Nov 08; 16(42):12710-7. PubMed ID: 20853281.
    Abstract:
    A self-assembly approach to tuning the optical properties of a star copolymer is reported herein. The star copolymer HCP-star-PEG with a hyperbranched conjugated polymer (HCP) core and many linear poly(ethylene glycol) (PEG) arms has been prepared successfully. The HCP core was synthesized by Wittig coupling of N-(n-hexyl)-3,6-diformylcarbazole and 1,3,5-bis[(triphenylphosphonio)methyl]benzene tribromide. Subsequently, the linear PEG arms were grafted onto the HCP core by acylhydrazone connection. It was found that the optical properties of HCP-star-PEG in chloroform solution changed on addition of acid. Both (1)H NMR and UV/Vis spectroscopic investigations confirmed that the variation of the optical properties was related to the complexation of the acid and the imine bond in the acylhydrazone group. HCP-star-PEG self-assembled into core-shell micelles in the mixed solvent of chloroform and acetonitrile, which affected the protonation of the imine bond. Therefore the optical properties of HCP-star-PEG can be readily controlled by self-assembly.
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