Recyclable sulfone-containing polymersviaring-opening polymerization of macroheterocyclic siloxane monomers: synthesis, properties and recyclability

Abstract

The first recyclable sulfone-containing polysiloxanes were synthesized via an anionic ring-opening polymerization of macroheterocyclic siloxane monomers.

Preparation and Properties of Benzylsulfonyl‐Containing Silicone Copolymers via Ring‐opening Copolymerization of Macroheterocyclosiloxane and Cyclosiloxane

“…The TGA data presented in Figure 5 indicates that following incorporation of BSM, all benzylsulfonyl polysiloxanes exhibited higher T d and T max than the neat PDMS (Table S1, run 6). For instance, in the case of PSMS 18 , an obvious increase in T d and T max from 269°C (PDMS) to 320°C (PSMS 18 ) and from 309°C to 379°C was observed, respectively (Figure 5a). The increase was attributed to the incorporation of aromatic and sulfone segments.…”

“…Previous studies suggested KOH as the suitable catalyst for homopolymerization of BSM in dimethyl sulfoxide (DMSO). [18] Accordingly, the copolymerization of BSM with octamethylcyclosiloxane (D 4…”

“…[21] Figure 1. Typical GPC traces of silicone copolymers: (a) PSMS 18 It was speculated that this might be due to the thermodynamic equilibrium between cyclic and linear chain populations. Thus, the copolymerization resembles the equilibrium polymerization of cyclic siloxanes.…”

“…[17] Concurrently, we found that benzylsulfonyl macroheterocyclosiloxane (BSM) could undergo anionic ROP to afford recyclable sulfone-containing polysiloxanes. [18] Although the hybrid polysiloxanes could be prepared as polysiloxane nanofibers by electrospinning, due to the employed homopolymerization methods, the structures and properties of the obtained materials were not adjustable, which limited further application of the macrocyclic monomers. It was proposed that to expand the scope of potential applications of macrocyclic siloxanes as well as to explore new silicone-containing polymers, copolymerization with commercial monomers was an effective strategy.…”

Luminescent and Robust Perovskite–Silicone Elastomers Prepared by Light Induced Thiol–Ene Reaction

“…Sulfone-containing silicone copolymers were synthesized by ring-opening copolymerization of octamethylcyclosiloxane (D 4 ), 2,4,6,8-tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane (D 4 Vi ), and benzylsulfonyl macroheterocyclosiloxane (BSM) (Scheme 1a). [12] The copolymerization was conducted in a mixed solvent of dimethylformamide (DMF) and toluene at 120 °C using KOH as the catalyst. As shown in Figure S1, Supporting Information, the ring-opening polymerization was monitored by the analysis of the 1 H NMR spectrum, which showed a downfield shift of two proton peaks at 2.52 ppm (SO 2 CH 2 CH 2 ) and 0.74 ppm (CH 2 CH 2 Si) to 3.00 and 1.09 ppm, respectively.…”