Mechanically tough dynamic poly(disulfide)s crosslinked by acylsemicarbazides

Area of Science:

• Polymer Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Dynamic polymer networks offer unique self-healing and reconfigurable properties.
• Achieving enhanced mechanical strength alongside dynamic behavior remains a challenge.

Purpose of the Study:

• To investigate the use of acylsemicarbazide as a crosslinking agent in dynamic poly(disulfide) networks.
• To enhance the mechanical properties and toughness of these networks while maintaining reconfigurability.

Main Methods:

• Synthesis of poly(disulfide) networks incorporating acylsemicarbazide.
• Characterization of the crosslinking mechanisms (covalent and noncovalent).
• Mechanical testing (stretchability, strength, toughness) and assessment of dynamic reconfigurability.

Main Results:

• Acylsemicarbazide effectively forms synergistic covalent and noncovalent crosslinkers within the poly(disulfide) network.
• The resulting dry supramolecular network demonstrated significantly enhanced stretchability, mechanical strength, and toughness.
• The material retained its dynamic reconfigurability, allowing for material reprocessing and adaptation.

Conclusions:

• Acylsemicarbazide is a highly effective additive for toughening dynamic poly(disulfide) networks.
• The synergistic crosslinking approach provides a pathway to advanced materials with superior mechanical performance and recyclability.