title: Silicone boronates reversibly crosslink using Lewis acid-Lewis base amine complexes.
abstract: Silicone elastomers are normally thermosets, which are not readily recycled or repurposed. The few examples of thermoplastic silicone elastomers depend on reversible covalent and non-covalent molecular interactions. It is demonstrated that amine-boronate complex formation provides a simple and flexible route to reversible crosslinked silicones. A variety of network structures were prepared by use of terminal and pendantly functionalised silicone boronates and amines. The crosslink density was quantified using a combination of Shore-hardness measurements, swelling, and rheological analyses. Stress induced by compressive force could be relieved through dynamic B-N bond reformation at 60 °C. Materials could be fully disassembled through introduction of n-butylamine and successfully reformed upon removal of the monofunctional amine by evaporation.
authors.affiliation: Department of Chemistry and Chemical Biology, McMaster University, 1280 Main St. W., Hamilton ON, L8S 4M1 (Canada).
authors.forename: Laura
authors.initials: L
authors.lastname: Dodge
authors.forename: Yunqing
authors.initials: Y
authors.lastname: Chen
authors.forename: Michael A
authors.initials: MA
authors.lastname: Brook
keywords: Lewis acids; Lewis bases; amine crosslinkers; boronic acid; silicone polymers