Trifluoromethanesulfonic acid triflic acid

L,L-Lactide from Purac was recrystallized from 2-propanol, sublimated, and stored under vacuum. The 2-bromoethanol (95%), 4-hydroxybenzophenone (HBP, 98%), hexamethylene diisocyanate (HDI, 99%), ethylene glycol (EG, 99.8%), which were all from Sigma-Aldrich (St. Luis, MO, USA/Steinheim, Germany), were used as received. Acrylonitrile (AN, 99%) was passed through an inhibitor removal column filled with silica gel and distilled under a vacuum. Styrene was purified with basic Al₂O₃ to remove the inhibitor and distilled under a vacuum. Trifluoromethanesulfonic acid (triflic acid, 99%) from Sigma-Aldrich was distilled under vacuum, and dibutyltin dilaurate (DBTDL, 98%) from ABCR was used as received. Dichloroethane (DCE, pure p.a.), dimethylformamide (DMF, pure p.a.), and anisole (pure p.a.) from POCH (Gliwice, Poland) were dried over CaH₂, distilled before use, and stored over molecular sieves (4 Å). Chloroform (pure p.a.), 2-propanol (pure p.a.), ethanol (pure p.a.), diethyl ether (pure p.a.), and hexane (99%), all from POCH (Gliwice, Poland), were used as received. Potassium hydroxide (pure p.a.) was obtained from POCH (Gliwice, Poland), magnesium sulfate (MgSO₄, 99%) was obtained from Chempur (Piekary Slaskie, Poland), and both were used as received.

Octamethylcyclotetrasiloxane (D₄, 98%, Sigma-Aldrich), trifluoromethanesulfonic acid (triflic acid, 99%, Sigma-Aldrich), heptamethylcyclotetrasiloxane (tech-95, Gelest), trivinylmethylsilane (95%, Gelest), platinum(0)-1,3-divinyl-1,1,3,3-tertramethyldisiloxane in xylene (Pt catalyst, 2% of Pt, Sigma-Aldrich), perylene-3,4,9,10-tetracarboxylic dianhydride (97%, Sigma-Aldrich), and solvents were used as purchased. CB pearls 2000 (BP-2000) were offered by Cabot Corporation, silica nanoparticles (20 nm) were purchased from Sigma-Aldrich, and PTFE nanoparticles (MPD170, 20-50 nm) were purchased from DuPont. All the chemicals were used directly without further treatment.