Experimental Section: Synthesis of the scC02 Soluble Stabilizer. The stabilizer synthesis was adapted from that of Pilati et al.18 beginning with ROP of e-CL from the terminal hydroxyl groups of the "C02-philic" PFPE macromonomer, inaccordance with the activated chain end mechanism proposed by Penczek19 (Scheme 1).Fluorolink DIO (10 g) was reacted in bulk with c-CL(13.5 mL, PFPE•.CL molar ratio) at 120 oc for 18 husing Sn(Oct)2 (0.5 mL) catalyst. The terminal dihy-droxyl groups of the polymer were then end capped withacetyl chloride, to improve solubility in scC0220 and to prevent the stabilizer acting as an initiator during thepoly merization of L-lactide. IH NMR analysis showed that the hydroxyl end groups had fully reacted. SECanalysis of this PCL—PFPE—PCL stabilizer exhibits a single peak, demonstrating no homopolymerization of PCL, and PDI was estimated against polystyrene standards to be 1.27, indicating that propagation was controlled.
Experimental Section: Synthesis of the scC02 Soluble Stabilizer. The stabilizer synthesis was adapted from that of Pilati et <br><br>al.18 beginning with ROP of e-CL from the terminal hydroxyl groups of the "C02-philic" PFPE macromonomer, in<br>accordance with the activated chain end mechanism proposed by Penczek19 (Scheme 1).<br>Fluorolink DIO (10 g) was reacted in bulk with c-CL(13.5 mL, PFPE•.CL molar ratio) at 120 oc for 18 h<br>using Sn(Oct)2 (0.5 mL) catalyst. The terminal dihy-droxyl groups of the polymer were then end capped with<br>acetyl chloride, to improve solubility in scC0220 and to prevent the stabilizer acting as an initiator during thepoly merization <br><br>of L-lactide. IH NMR analysis showed that the hydroxyl end groups had fully reacted. SEC<br>analysis of this PCL—PFPE—PCL stabilizer exhibits a single peak, demonstrating no homopolymerization of PCL, and PDI was <br><br>estimated against polystyrene standards to be 1.27, indicating that propagation was controlled.
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