The synthesis was carried out in a 50 mL round-bottom flask. Glycerol and sebacic acid were weighed into the flask in an equimolar ratio of functional groups. Then, the catalyst, p-toluensulfonic acid (PTSA), was weighed. The catalyst content was a percentage by weight of the sum of the reactants (Table ). The flask was heated in an oil bath using a hotplate with an IKA RET basic magnetic stirrer (150 rpm, 150℃). The temperature was measured using an IKA ETS-D5 sensor coupled to the hotplate and placed in a glass probe cover inside the reaction mixture. After the reagents had completely melted and a homogeneous mixture had been obtained, the pressure was reduced to 100 mbar using a water aspirator. The pressure was regulated using a Buchi B-720 controller with an accuracy of ±5 mbar. The syntheses were carried out in an automated 600 mL LabMax reactor from Mettler Toledo. The reactor with a heating and cooling jacket was equipped with a mechanical stirrer (Mettler Toledo), a temperature sensor (Mettler Toledo), a Dean-Stark apparatus, a pressure regulator (Buchi B-720) and a water aspirator. The reactor jacket was heated to 50℃. During heating, sebacic acid (269 g, 1.33 mol) and glycerine (82 g, 65 mL, 0.89 mol) were weighed into the reactor, ensuring an equimolar ratio of functional groups. The PTSA catalyst was added in an amount of 0.1 wt.% relative to the sum of the monomers. The catalyst was used in the form of an ethanol solution at a concentration of 0.35 g/mL (1.0 mL was added to the reaction mixture). After weighing all the components of the reaction mixture, the stirrer was accelerated to 50 rpm in 1 min. The process was then carried out in the following sequence: