Loose-fit polypseudorotaxanes constructed from γ-CDs and PHEMA-PPG-PEG-PPG-PHEMA

Tao Kong, Lin Ye, Ai Ying Zhang, Zeng Guo Feng*

*Corresponding author for this work

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Abstract

A pentablock copolymer was prepared via the atom transfer radical polymerization of 2-hydroxyethyl methacrylate (HEMA) initiated by 2-bromoisobutyryl end-capped PPO-PEO-PPO as a macroinitiator in DMF. Attaching PHEMA blocks altered the selfassembly process of the pentablock copolymer with γ-CDs in aqueous solution. Before attaching the PHEMA, the macroinitiator was preferentially bent to pass through the inner cavity of γ-CDs to give rise to tight-fit double-chain stranded polypseudorotaxanes (PPRs). After attaching the PHEMA, the resulting pentablock copolymer was single-chain stranded into the interior of γ-CDs to form more stable, loose-fit PPRs. The results of 1H NMR, WXRD, DSC, TGA, 13C CP/MAS NMR and FTIR analyses indicated that γ-CDs can accommodate and slip over PHEMA blocks to randomly distribute along the entire pentablock copolymer chain. This results in unique, single-chain stranded PPRs showing no characteristic channel-type crystal structure.

Original languageEnglish
Pages (from-to)2461-2469
Number of pages9
JournalBeilstein Journal of Organic Chemistry
Volume10
DOIs
Publication statusPublished - 23 Oct 2014

Keywords

  • Block copolymer
  • Loose-fit
  • Poly(2-hydroxyethyl methacrylate)
  • Polypseudorotaxane the authors acknowledge support from the natural science foundation of china (no. 20974015) and the doctoral program foundation of the ministry of education of china (no. 20091101110029).
  • γ-cd

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Kong, T., Ye, L., Zhang, A. Y., & Feng, Z. G. (2014). Loose-fit polypseudorotaxanes constructed from γ-CDs and PHEMA-PPG-PEG-PPG-PHEMA. Beilstein Journal of Organic Chemistry, 10, 2461-2469. https://doi.org/10.3762/bjoc.10.257