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pH-responsive nanoaggregation of diblock phosphorylcholine copolymers.

Q S Mu1, X B Zhao, J R Lu

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|July 22, 2008
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Larger amine groups on zwitterionic copolymers increase hydrophobicity and micelle formation. MPC30-DMA60 forms rigid cylinders, while MPC30-DEA60 and MPC30-DPA60 show increased aggregation.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomaterials

Background:

  • Zwitterionic polymers, like those with phosphorylcholine groups, are crucial for biomaterials due to their biocompatibility.
  • Tertiary amine groups introduce pH-responsiveness and tunable hydrophobicity to polymers.
  • Understanding the self-assembly behavior of block copolymers is key to designing advanced functional materials.

Purpose of the Study:

  • To characterize three diblock copolymers with varying tertiary amine substituents (DMA, DEA, DPA) and a phosphorylcholine block.
  • To investigate the impact of tertiary amine size on copolymer surface tension, aggregation behavior, and solution conformation.
  • To elucidate the relationship between copolymer structure, hydrophobicity, and self-assembly in aqueous solutions.

Main Methods:

  • Synthesis and characterization of three diblock copolymers: MPC30-DMA60, MPC30-DEA60, and MPC30-DPA60.
  • Surface tension measurements to assess interfacial properties.
  • Dynamic light scattering (DLS) and small-angle neutron scattering (SANS) to study solution aggregation and structure.

Main Results:

  • Increasing tertiary amine substituent size (DMA < DEA < DPA) enhanced copolymer hydrophobicity and the tendency for micellar aggregation.
  • MPC30-DMA60 did not aggregate, forming rigid, thin cylindrical structures whose length was dependent on concentration, temperature, and pH.
  • MPC30-DEA60 exhibited pH- and concentration-dependent conformational changes and micellar aggregation at pH 9.
  • MPC30-DPA60, the most hydrophobic, showed significantly reduced solubility and strong aggregation.

Conclusions:

  • Tertiary amine substituent size is a critical factor controlling the self-assembly and solubility of phosphorylcholine-based diblock copolymers.
  • The rigidity and conformational transitions of MPC30-DMA60 cylinders highlight the influence of block association at higher concentrations.
  • These findings provide insights into the design of responsive polymeric materials for applications in drug delivery and surface modification.