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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Novel pH- and temperature-responsive polymer: tertiary amine starch ether.

Xu Yuan1, Benzhi Ju1, Shufen Zhang1

  • 1State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Rd., Hi-tech Zone, Dalian 116024, Liaoning, PR China.

Carbohydrate Polymers
|September 30, 2014
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Summary

Researchers developed a novel dual pH- and temperature-responsive starch ether (TAS). Its cloud point temperature is tunable across a wide range by adjusting chemical properties, offering versatile biomaterial applications.

Keywords:
Phase separationStarchStimuli-responsive polymersTertiary amine polymer

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomaterials Engineering

Background:

  • Responsive polymers are crucial for advanced applications.
  • Starch-based materials offer biocompatibility and sustainability.
  • Developing dual-responsive polymers with tunable properties remains a challenge.

Purpose of the Study:

  • To synthesize and characterize a novel double pH- and temperature-responsive tertiary amine starch ether (TAS).
  • To investigate the influence of structural parameters on the responsive behavior of TAS.
  • To explore the potential of TAS in developing advanced biomaterials.

Main Methods:

  • Grafting dipropyl or dibutyl epoxypropylamine onto hydroxyethyl starch.
  • Characterization of tertiary amine starch ether (TAS) properties.
  • Determination of cloud point temperatures (TC) under varying pH and structural conditions.

Main Results:

  • Successfully synthesized dual pH- and temperature-responsive TAS.
  • Tunable cloud point temperatures (TC) ranging from 26 to 72.8°C achieved by modifying alkyl chain length, molar substitution (MS), and pH.
  • Demonstrated a linear relationship between TC and pH, indicating precise control over responsiveness.
  • Observed single pH-sensitive properties due to tertiary amino and hydrophobic alkyl groups.

Conclusions:

  • The developed TAS exhibits promising dual responsiveness with tunable properties.
  • The synthetic strategy is adaptable for creating other responsive polysaccharide-based biomaterials.
  • These findings open avenues for novel applications in drug delivery, tissue engineering, and smart materials.