Journal
MOLECULES
Volume 23, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/molecules23020405
Keywords
boron; Lewis acid; transient polymer networks; organoborane; supramolecular polymers; telechelic polymers; organoboron polymers; self-healing
Funding
- National Science Foundation [CHE-1609043]
- Rutgers University under SEED [202607]
- NSF-MRI [CHE-1229030]
- Polymer and Nanomaterials Facility at Rutgers University Newark by the New Jersey Higher Education Equipment Leasing Fund [ELF III 047-04]
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The use of thermo-reversible Lewis Pair (LP) interactions in the formation of transient polymer networks is still greatly underexplored. In this work, we describe the synthesis and characterization of polydimethylsiloxane/polystyrene (PDMS/PS) blends that form dynamic Lewis acid-Lewis base adducts resulting in reversible crosslinks. Linear PS containing 10 mol % of di-2-thienylboryl pendant groups randomly distributed was obtained in a two-step one-pot functionalization reaction from silyl-functionalized PS, while ditelechelic PDMS with pyridyl groups at the chain-termini was directly obtained via thiol-ene click chemistry from commercially available vinyl-terminated PDMS. The resulting soft gels, formed after mixing solutions containing the PDMS and PS polymers, behave at room temperature as elastomeric solid-like materials with very high viscosity (47,300 Pa.s). We applied rheological measurements to study the thermal and time dependence of the viscoelastic moduli, and also assessed the reprocessability and self-healing behavior of the dry gel.
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