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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • Developing advanced polymer networks with tailored mechanical and thermal properties is crucial for new material applications.
  • Dual-crosslinking strategies offer a pathway to combine reversible and permanent network characteristics.
  • Incorporating furan and norbornene functionalities enables specific crosslinking chemistries like Diels-Alder reactions.

Purpose of the Study:

  • To synthesize and characterize terpolymers of ethylene glycol dicyclopentenyl ether methacrylate (EGDEMA), vegetable oil based alkyl methacrylate (C13MA), and furfuryl methacrylate (FMA).
  • To create single-crosslinked reversible and dual-crosslinked networks using Diels-Alder (DA) chemistry and thiol-ene crosslinking.
  • To evaluate the impact of crosslinking strategies on the mechanical, thermal, and adhesive properties of the resulting materials for potential use in recyclable adhesives.

Main Methods:

  • Terpolymerization using initiators for continuous activator regeneration (ICAR) atom transfer radical polymerization (ATRP).
  • Crosslinking via Diels-Alder (DA) reaction with 1,1'-(methylenedi-4,1-phenylene)bismaleimide (BM) and thiol-ene reactions.
  • Photo-initiation using UV light and thermal initiation for crosslinking.
  • Characterization using Fourier-transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC).
  • Evaluation of adhesive properties through rheological testing.

Main Results:

  • Successful synthesis of terpolymers with controlled incorporation of furan and norbornene functionalities.
  • Formation of both single-crosslinked reversible DA networks and dual-crosslinked networks with additional thiol-ene linkages.
  • UV curing demonstrated higher efficiency for dual-crosslinked systems, leading to increased gel content.
  • FTIR and DSC confirmed the formation of DA adducts and the reversibility of the DA reaction.
  • Rheological testing indicated suitability for adhesive applications.

Conclusions:

  • Dual-crosslinking strategies combining reversible DA chemistry and permanent thiol-ene bonds yield materials with enhanced mechanical strength and thermal stability.
  • The developed terpolymers offer functional versatility and are promising candidates for recyclable adhesive applications.
  • UV curing is an effective method for achieving high crosslinking efficiency in these dual-crosslinked systems.