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Related Experiment Videos

Reverse thermo-responsive poly(ethylene oxide) and poly(propylene oxide) multiblock copolymers.

Alejandro Sosnik1, Daniel Cohn

  • 1The Casali Institute of Applied Chemistry, The Hebrew University of Jerusalem, Givat Ram Campus, 91904 Jerusalem, Israel. ale.sosnik@utoronto.ca

Biomaterials
|July 28, 2004
PubMed
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New reverse thermo-responsive polymers were synthesized using poly(ethylene oxide) and poly(propylene oxide) blocks. These advanced materials exhibit significantly enhanced rheological properties and tunable sol-gel transitions for novel applications.

Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Rheology

Background:

  • Development of novel polymers with tunable properties is crucial for advanced applications.
  • Thermo-responsive polymers that exhibit reverse thermal gelation are of significant interest.
  • Existing polymers often lack the desired rheological performance and controlled phase transitions.

Purpose of the Study:

  • To synthesize novel poly(ethylene oxide)-poly(propylene oxide) multiblock copolymers.
  • To investigate the impact of coupling molecules and polymer architecture on rheological properties and thermal gelation.
  • To explore the potential for creating biodegradable reverse thermo-responsive polymers.

Main Methods:

  • Covalent binding of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) segments using carbonyl chloride and diacyl chlorides.

Related Experiment Videos

  • Synthesis of alternating poly(ether-carbonate) and poly(ether-ester) copolymers with varying chain extenders.
  • Rheological measurements of aqueous polymer solutions.
  • Sol-gel transition temperature determination.
  • Dynamic light scattering analysis to study aggregate size.
  • Incorporation of aliphatic oligoesters for biodegradability.

    • Main Results:

    • Synthesized multiblock copolymers displayed significantly enhanced rheological properties compared to commercial standards (e.g., 140,000 Pas vs. 5,000 Pas for Pluronic F127).
    • The choice of chain extender critically influenced the sol-gel transition; ortho-phthaloyl chloride induced gelation at 43°C, while others did not.
    • Dynamic light scattering confirmed that the PEO/PPO ratio affects aggregate size in aqueous solutions.
    • Biodegradable poly(ether-ester-carbonate)s exhibiting reverse thermal gelation were successfully generated.

    Conclusions:

    • Novel poly(ethylene oxide)-poly(propylene oxide) multiblock copolymers offer superior rheological performance and controlled reverse thermal gelation.
    • The polymer architecture, particularly the chain extender, is key to tuning sol-gel transition properties.
    • These findings pave the way for developing advanced, biodegradable thermo-responsive materials for diverse applications.