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Multiresponsive Azobenzene End-Cap for Self-Immolative Polymers.

Andrew D Wong1, Thomas M Güngör2, Elizabeth R Gillies2

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Azobenzene end-caps trigger self-immolative polymer depolymerization via reduction and UV light. This novel approach offers visual signaling and multiresponsive capabilities for advanced polymer materials.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Self-immolative polymers (SIPs) are designed to depolymerize in a sequential manner upon triggering.
  • Developing versatile end-caps that can initiate depolymerization and offer additional functionalities is crucial for advancing SIP technology.

Purpose of the Study:

  • To introduce azobenzene as a novel multiresponsive end-cap for self-immolative polymers.
  • To demonstrate the triggered depolymerization of polycarbamates using azobenzene end-caps.
  • To explore the visual signaling and isomerization capabilities of the azobenzene end-cap.

Main Methods:

  • Synthesis of azobenzene derivatives and their incorporation as end-caps onto polycarbamates.
  • Investigation of depolymerization triggered by reducing agents (hydrazine, dithiothreitol) using small-molecule models and polymer samples.
  • Characterization of spectral changes (UV-Vis) upon reduction and evaluation of photoisomerization (trans-cis) under UV light.

Main Results:

  • Azobenzene end-caps successfully initiated the depolymerization of polycarbamates via a 1,6-elimination reaction upon reduction.
  • The reduction of azobenzene to hydrazobenzene caused a visible color change, providing a visual signal for triggered depolymerization.
  • The azobenzene end-cap demonstrated responsiveness to UV light through trans-cis isomerization, adding another layer of functionality.

Conclusions:

  • Azobenzene serves as an effective multiresponsive end-cap for self-immolative polycarbamates.
  • This end-cap enables triggered depolymerization, visual signaling, and photoisomerization, enhancing the utility of SIPs.
  • The findings open avenues for designing advanced materials with tunable degradation and signaling properties.