Novel star-shaped polylactide with glycerol using stannous octoate or tetraphenyl tin as catalyst: 1. Synthesis, characterization and study of their biodegradability

Star-shaped poly[(trimethylene carbonate)-co-(ɛ-capro-lactone)] and its block copolymers with lactide/glycolide: synthesis, characterization and properties

“…For low molecular weight oligomers of L-lactide initiated with glycerol 11) and pentaerythritol 12) this has been proved by NMR endgroup analysis. This method would also be suitable for poly(TMC-co-e-CL), however, for higher molecular weights the NMR signal becomes too weak to be measured accurately, due to the low density of chain ends.…”

Synthesis and characterization of aliphatic polyesters from glycerol, by-product of biodiesel production, and adipic acid

“…adsorbed water) and post-curing processes. The degradation of the polyester chain took place at temperatures higher than 300 °C, as observed for many aliphatic polyesters [19][20][21][22] . The main degradation step occurred at ~ 300 to 485 °C, with a weight loss in the range of 96 to 98%.…”

Synthesis of poly(D,L‐lactic acid) modified by triethanolamine by direct melt copolycondensation and its characterization

“…The intrinsic viscosity ([g]) of PLA modified by TEA was determined with Ubbelohde viscometer (CannonUbbelohde, State College, PA) by the single-point method using CHCl 3 as solvent at 25 C. According to the literatures, [17][18][19] the relative molecular weight and molecular weight distribution of the modified PLA were determined by gel permeation chromatography (Waters 1515 pump, Torrance, CA) with tetrahydrofuran as solvent and with polystyrene as reference at 35 C and a flow velocity of 1 mL min…”