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Related Experiment Videos

[Study on synthesis of physically crosslinked biomedical polyurethane hydrogel].

Zhengyan Yin1, Hong Niu, Hong Tan

  • 1Department of Polymer Materials Science & Engineering, Sichuan University, Chengdu 610065, China.

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi = Journal of Biomedical Engineering = Shengwu Yixue Gongchengxue Zazhi
|July 22, 2006
PubMed
Summary

This study introduces a novel diol chain extender, bis-hydroxylethyl carbomate (EC-AE), for synthesizing polyurethanes. The resulting polyurethane PUA25 demonstrates unique hydrogel formation and thermal cycling properties due to enhanced hydrogen bonding.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomaterials

Background:

  • Polyurethanes are versatile polymers with applications in various fields.
  • Developing novel chain extenders is crucial for tailoring polyurethane properties.
  • Physically crosslinked hydrogels offer advantages in stimuli-responsive applications.

Purpose of the Study:

  • To synthesize a novel diol chain extender, bis-hydroxylethyl carbomate (EC-AE).
  • To investigate the structure and properties of polyurethanes synthesized with EC-AE and a conventional extender (BDO).
  • To explore the hydrogel formation and thermal responsiveness of these polyurethanes.

Main Methods:

  • Synthesis of bis-hydroxylethyl carbomate (EC-AE) using ethylene carbonate and ethanolamine.

Related Experiment Videos

  • One-step polymerization to create polyurethanes PUA25 (with EC-AE) and PUB25 (with BDO).
  • Characterization using Fourier-transform infrared spectroscopy (FT-IR) and Differential scanning calorimetry (DSC).
  • Investigation of hydrogel formation and thermal cycling behavior.

    • Main Results:

    • PUA25 exhibited a lower degree of microphase separation compared to PUB25.
    • PUA25 showed a higher amount of hydrogen bonding between hard and soft segments.
    • Only PUA25 formed hydrogels in situ upon cooling from a solution.
    • PUA25-based hydrogels demonstrated a reversible "gel-sol-gel" transition under thermal cycling.

    Conclusions:

    • The novel EC-AE chain extender facilitates the creation of polyurethanes with enhanced hydrogen bonding.
    • Polyurethanes synthesized with EC-AE can form physically crosslinked hydrogels with tunable properties.
    • These hydrogels exhibit promising stimuli-responsive behavior for potential applications.