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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomaterials

Background:

  • Copolymers based on pullulan and polyetheramine (PEA) are synthesized.
  • The PEA component has a specific propylene oxide/ethylene oxide (PO/EO) ratio of 29/6.
  • Copolymers are linked via an amine group to pullulans of varying chain lengths.

Purpose of the Study:

  • To deeply investigate the water-soluble properties of pullulan-block-polyetheramine copolymers.
  • To understand the influence of polysaccharide/PEA (PS/PEA) ratio on copolymer behavior.
  • To characterize the pH and thermo-sensitive nature of these copolymer systems.

Main Methods:

  • Macroscopic measurements including cloud point and enthalpy.
  • Mesoscopic scale approaches such as critical aggregation concentration (CAC) determination.
  • Analysis of mean number average hydrodynamic diameter (Dh) and aggregation number (Nag).

Main Results:

  • Copolymers exhibit pH and thermo-sensitive behavior.
  • Three distinct states were identified: unimers below CAC, water-soluble aggregates above CAC, and non-soluble aggregates at higher temperatures for low PS/PEA ratios.
  • Hydrophobic interactions drive aggregation above CAC, while dehydration of PEA groups causes insolubility at elevated temperatures.

Conclusions:

  • The aggregation behavior of pullulan-block-polyetheramine copolymers is dependent on PS/PEA ratio and temperature.
  • These copolymers can exist as unimers, soluble aggregates, or insoluble aggregates under varying conditions.
  • The study provides insights into designing stimuli-responsive polymeric materials.