The Development of the L-Lactide Polymerisation Procedures

Abstract

To determine the appropriate conditions for the polymerization of (Llactide), to obtain poly(L-lactide) a few different methods were applied: in closed vials under vacuum, in the reactor under high pressure, in the microwave reactor and in a reactor with solvent using the initiator. The molecular masses of prepared samples were determined using GPC method. It was assessed that by microwave synthesis method for the polymerization time less than 30 minutes the resulting polymer have the highest molecular mass, 178.000 g mol-1. It was estimated that the samples synthesized with trifluoromethanesulfonic acid as initiator have the best thermal stability.

Za određivanje optimalnih uslova za polimerizacije (L- laktida), za dobijanje poli (L-laktida) (PLLA) primenjene su različite metode polimerizacije: u zatvorenim posudama pod vakumom, u reaktoru pod visokim pritiskom, mikrotalasnom polju i u rastvoru sa inicijatorom. Za određivanje molekulskih masa korišćena je GPC metoda. Ustanovljeno je da je mikrotalasna sinteza postupak sa najkraćim vremenom polimerizacije (manjim od 30 minuta) pri čemu je nastaje polimer koji ima najveću molarnu masu 178.000 g mol-1. Najbolju termičku stabilnost imao je uzorak PLLA sintetisan sa trifluorometansulfonskom kiselinom kao inicijatorom.