Dimethylformamide dmf

Cork particles with a diameter of 63–125
μm and an average density of ρ = 200 kg/m³ were
supplied by the company Corchos del Estrecho, obtained from cork dust
residues from the sanding processes during the manufacture of cork
stoppers. ASA pellets (ASA LI912, ρ = 1100 kg/m³)
were purchased from LG Chem. Acetic anhydride, pyridine, and sodium
hydroxide were purchased from Sigma-Aldrich. Acryloyl chloride (96%),
triethylamine (TEA), n-butyl acrylate (nBA, +98%) and 2,2′-azobis(2-methylpropionitrile) (AIBN) were
purchased from Alfa Aesar. Toluene, dimethylformamide (DMF), dichloromethane
(DCM), and isopropanol were purchased from Scharlau.

All chemicals were of the highest available purity and used as received, without further purification. Cadmium oxide (CdO, powder, 99.5%), selenium (Se, powder, 99.99%), trioctylphosphine oxide (TOPO, technical grade), tributylphosphine (TBP, 99%), tert-butyl phosphonic acid (TBPA) dimethyl sulfoxide (DMSO, 99.7%), ammonium sulfide solution ((NH₄)₂S, 40–48 wt% in water) and hexane (99%) were purchased from Aldrich. Hexadecylamine (HDA, 99%) was purchased from Fluka.
Azobis(2-methylpropionitrile) (AIBN, 99%) was received from Aldrich and purified by recrystallization from methanol. N-vinylimidazole (99%) and 1-bromobutane (99%) were obtained from Alfa Aesar and used as received. Potassium hexafluorophosphate (KPF6, >98%) was received from Roth and used as received. O-Ethyl-S-[(1-methoxycarbonyl)ethyl] dithiocarbonate (1 in Scheme 1) and O-ethyl-S-[(1-methoxycarbonyl)ethyl] dithiocarbonate (2 in Scheme 1) were prepared following a procedure already described [44 ,45 ]. Hexylamine (99%, Sigma-Aldrich, Seelze, Germany), dimethylformamide (DMF) (≥99.7%, Scharlau, Barcelona, Spain), tetrahydrofuran (THF) (99.5%, Fischer, Germany), acetone (99.5%, VWR, Fontenay-sous-Bois, France), diethyl ether (anhydrous, Baker, Deventer, Netherlands) and pentane (>99.5%, Fluka) were used without further purification.