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Ascorbic Acid-Modified Silicones: Crosslinking and Antioxidant Delivery.

Guanhua Lu1, Akop Yepremyen1, Khaled Tamim1

  • 1Department of Chemistry and Chemical Biology, McMaster University, 1280 Main St. W., Hamilton, ON L8S 4M1, Canada.

Polymers
|November 26, 2022
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Summary
This summary is machine-generated.

Researchers developed a method to create antioxidant elastomers by modifying silicones with vitamin C (ascorbic acid). This innovation allows for tunable material properties and harnesses natural compounds in polymer science.

Keywords:
antioxidant activityascorbic acidaza-Michael additionreductive cleavagesilicone elastomer

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomaterials

Background:

  • Vitamin C (ascorbic acid) is a potent antioxidant but difficult to incorporate into materials due to its functional groups.
  • Selective modification of vitamin C is key to creating functionalized materials.

Purpose of the Study:

  • To develop a straightforward method for tethering vitamin C to silicone polymers.
  • To create novel antioxidant elastomers with tunable properties.

Main Methods:

  • Protection of vitamin C's enediol as benzyl ethers.
  • Introduction of an acrylate ester at C1 of vitamin C.
  • Synthesis of vitamin C-modified silicones via aza-Michael reactions.
  • Tuning crosslinking density by controlling amine/acrylate ratios.

Main Results:

  • Robust vitamin C-modified silicone elastomers were synthesized.
  • Material modulus was tunable by adjusting the vitamin C to amine ratio.
  • Deprotection of benzyl ethers led to increased crosslinking.
  • Antioxidant small molecules or elastomers were produced.

Conclusions:

  • A facile method for creating vitamin C-functionalized silicones was established.
  • The developed elastomers exhibit tunable antioxidant properties.
  • Natural materials can be effectively integrated into silicone polymer design.