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Controlling vesicle formation via interpolymer hydrogen-bonding complexation between poly(ethylene oxide)-block-polybutadiene and poly(acrylic acid) in solution

Macromolecules, ISSN: 0024-9297, Vol: 39, Issue: 14, Page: 4894-4898
2006
  • 61
    Citations
  • 0
    Usage
  • 20
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    61
    • Citation Indexes
      61
  • Captures
    20

Article Description

This paper describes a controllable vesicle formation of a diblock copolymer of poly(ethylene oxide)-block-polybutadiene (PEO-b-PB) and a homopolymer of poly(acrylic acid) (PAA) in a solvent mixture of THF and n-dodecane. The number-average molecular weights (M) of both the PEO and PB blocks are 5100 g/mol; the weight-average molecular weight (M ) of the PAA is ∼2000 g/mol. The assembly is driven by the hydrogen-bonding complexation between the complementary binding sites on PEO and PAA. The vesicles can load PAA far above the stoichiometrical monomer ratio of PAA to PEO ([AA]/[EO]). At 0.85 ≤ [AA]/[EO] ≤ 2.5, unilamellar vesicles (ULVs) with a constant membrane thickness of 16 nm are obtained in a controllable manner, of which the surface area increases linearly with [AA]/[EO]. Further increasing [AA]/[EO] above 3 results in the formation of multivesicular vesicles (MVVs). The PAA chains in ULVs are uniformly inserted into membranes with a direction preferentially perpendicular to the interface. When the PB blocks are unable to sufficiently cover the interface and the PEO blocks do not interact homogeneously with PAA chains, the MVVs form. © 2006 American Chemical Society.

Bibliographic Details

Wei Ping Gao; Yu Bai; Er Qiang Chen; Zi Chen Li; Qi Feng Zhou; Bing Yong Han; Wan Tai Yang

American Chemical Society (ACS)

Chemistry; Materials Science

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