The coil-to-globule-to-coil transition of linear polymer chains in dilute aqueous solutions: Effect of intrachain hydrogen bonding

Kejin Zhou, Yijie Lu, Junfang Li, Lei Shen, Guangzhao Zhang, Zuowei Xie, Chi Wu

Research output: Contribution to journalArticle

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Abstract

Our previous studies of the captioned transition have shown that thermally sensitive poly(Nisopropylacrylamide) (PNIPAM) in water can form stable individual single-chain globules, but not for polystyrene (PS) in cyclohexane. In the current study, using poly(N,N-diethylacrylamide) (PDEAM) (Mw = 1.7 × 107 g/mol and Mw/Mn = 1.06) with no hydrogen donator site, we intend to find whether the intrachain hydrogen bonding plays a role in stabilizing individual collapsed PNIPAM single-chain globules. We found that PDEAM can also form stable single-chain globules in water even though the transition is less sharp. The resultant individual PDEAM single-chain globules are less compact, reflecting in a lower chain density and a higher ratio of the radius of gyration to hydrodynamic radius, presumably due to the lack of intrachain hydrogen bonding. Our result also shows that, unlike PNIPAM, there is no hysteresis in the transition, indirectly supporting our previous assumption that the hysteresis observed for PNIPAM is due to the formation of some intrachain additional hydrogen bonds formed in the collapsed state.

Original languageEnglish (US)
Pages (from-to)8927-8931
Number of pages5
JournalMacromolecules
Volume41
Issue number22
DOIs
Publication statusPublished - Nov 25 2008

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ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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