Re-examination of the "Zipper Effect" in hydrogen-bonding complexes

Lin Deng, Chunhao Wang, Zi Chen Li, Dehai Liang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Using poly(acrylic acid) (PAA) and Polyacrylamide (PAAm) as an example, we studied the mechanism of hydrogen-bonding complexation in dilute solution by both static and dynamic light scattering. In 20 mM phosphate buffer at pH = 3, the condition suitable for complexation of PAA and PAAm, neither PAA nor PAAm stayed as individual polymer chains at 8.0 mg/mL. Instead, most of PAA formed multimacroion clusters" (or slow mode) due to the negative charges, and a small portion of PAAm formed associates mainly via hydrogen bonds. After PAA and PAAm solutions were mixed at stoichiometric ratio at room temperature, the slow mode, with PAA being dominant, persisted. The hydrogen-bonding complexation induced by cooling was evolved from the slow mode rather than from the single PAA or PAAm chains. Therefore, at the temperature where phase separation occurred, a fairly large amount of free PAAm chains still existed in the system. Our study demonstrated that the growth of the hydrogen-bonding complex, as well as the optimal ratio for complex, was highly dependent on the status of the component polymers before complexation.

Original languageEnglish (US)
Pages (from-to)3004-3010
Number of pages7
JournalMacromolecules
Volume43
Issue number6
DOIs
StatePublished - May 11 2010

ASJC Scopus subject areas

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

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