Polymerization-Depolymerization System Based on Reversible Addition-Dissociation Reaction of 1,3-Benzoxazine with...

Area of Science:

• Polymer Chemistry
• Organic Chemistry
• Materials Science

Background:

• 1,3-benzoxazine and thiol reactions are crucial in polymer synthesis.
• Understanding the reversibility of these reactions is key for developing dynamic materials.

Purpose of the Study:

• To investigate the reversible nature of the addition reaction between 1,3-benzoxazine and thiol.
• To explore the use of this reversible reaction in polymer synthesis and depolymerization.

Main Methods:

• Reactions were monitored using 1H NMR spectrometry in deuterated solvents (CDCl3 and CDCl3 + CD3OD).
• The dissociation of the product was confirmed to demonstrate reversibility.
• Polyaddition and depolymerization of bifunctional benzoxazine and dithiol were studied.

Main Results:

• The addition reaction between p-cresol-derived N-phenyl benzoxazine and 1-octadecanethiol was found to be reversible.
• CDCl3 was identified as a favorable solvent, with CD3OD accelerating the reaction.
• A bifunctional benzoxazine and dithiol underwent reversible polyaddition, forming a polymer that could be depolymerized.

Conclusions:

• The addition reaction of 1,3-benzoxazine and thiol is reversible at ambient temperature.
• This reversible reaction allows for the synthesis of polymers and their subsequent depolymerization.
• The findings open avenues for creating recyclable or degradable polymer materials.