D lactide

L-lactide and D-lactide (purity ≥98%) were purchased from Sigma-Aldrich. Before polymerization, both monomers, L-lactide and D-lactide, were purified by three successive re-crystallizations from 100% (w/v) solution in anhydrous toluene and dried under vacuum at room temperature. 1-Pyrenemethanol (Pyr-OH) (purity 98%) and stannous octanoate, tin(II) 2-ethylhexanoate (Sn(Oct)₂, purity ~95%) were purchased from Sigma-Aldrich and used as received. All solvents, toluene (anhydrous, purity 99.8%), chloroform (purity ≥99.5%), methanol (purity ≥99.8%), N-N-dimethylformamide (DMF) (anhydrous, purity 99.8%) and dimethyl ether (DME) (purity ≥99.0%) were purchased from Sigma Aldrich and used without further purifications. Graphite nanoplatelets (GnP) were synthesized by Avanzare (Navarrete, La Rioja, Spain) according to a previously reported procedure (Colonna et al., 2017a (link)). In brief, overoxidized-intercalated graphite was prepared starting from natural graphite, followed by rapid thermal expansion of at 1,000°C, to produce a worm-like solid, and then mechanically milled to obtain GnP.

Sodium carbonate, calcium chloride, poly(styrene sulfonate) (PSS, MW 70,000), poly(allylamine hydrochloride) (PAH, MW 58,000), poly(L-lysine-hydrobomide) (MW = 30,000–70,000), L-lactide, D-lactide, tannous octoate, ethylenediaminetetraacetic acid (EDTA) were obtained from Sigma-Aldrich and used without any further purification. HPCL gradient grade acetonitrile, dichloromethane and diethyl ether were purchased from Fisher Chemical and were used as received. The water used in the experiments and for the preparation of solutions was purified by a Milli-Q system and had a resistance of 18.2 MΩ·cm.