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Light-Programmable Polyester Networks with Movable Cross-Links for On-Demand Enzymatic Degradation.

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Researchers developed a novel photoresponsive polyester using movable cross-links. This material allows light-regulated enzymatic degradation, offering a new approach for sustainable polymers with tunable toughness and degradability.

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encrypted patterningmovable cross-linkson-demand degradationphotoresponsive polyestersstilbene isomerization

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Materials

Background:

  • Integrating mechanical toughness with on-demand degradability is a key challenge in materials science.
  • Sustainable polymers require innovative design strategies for controlled degradation.

Purpose of the Study:

  • To present a photoresponsive polyester with light-regulated enzymatic degradation.
  • To demonstrate a molecular-coverage-based design rule for reconciling material toughness and degradability.

Main Methods:

  • Synthesized a polyester backbone with photoisomerizable trans-stilbene (tSti) units and triacetylated gamma-cyclodextrin (TAcγCD) inclusion complexes.
  • Utilized UV-A and UV-C irradiation to induce reversible trans-cis isomerization of tSti units, controlling cyclodextrin ring positioning.
  • Assessed lipase-catalyzed degradation rates in response to light-induced conformational changes.

Main Results:

  • UV irradiation reversibly altered the positioning of cyclodextrin rings along the polyester backbone.
  • This repositioning switched the molecular coverage of enzyme-active ester groups, controlling degradation.
  • Polyester segments were exposed in the trans state, accelerating degradation, while shielded in the cis state, suppressing it.

Conclusions:

  • Controllable cyclodextrin positioning is essential for regulating polyester degradation.
  • The developed photoresponsive polyester offers tunable degradation via light stimuli.
  • This study provides a molecular-coverage-based design for sustainable, tough, and degradable polymers.