Artículos de revistas
Thermal properties of amphiphilic biodegradable triblock copolymer of l,l-lactide and ethylene glycol
Fecha
2010Registro en:
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, v.101, n.1, p.229-233, 2010
1388-6150
10.1007/s10973-009-0589-z
Autor
MOTHE, C. G.
AZEVEDO, A. D.
DRUMOND, W. S.
WANG, S. H.
Institución
Resumen
Samples of poly(l,l-lactide)-block-poly(ethylene glycol)-block-poly(l,l-lactide) (PLLA-PEG-PLLA) were synthesized from l,l-lactide polymerization using stannous 2-ethylhexanoate, Sn(Oct)(2) as initiator and di-hydroxy-terminated poly(ethylene glycol) (PEG) (M (n) = 4000 g mol(-1)) as co-initiator. The chemical linkage between the PEG segment and the PLA segments was characterized by Fourier transform infrared spectroscopy (FTIR). Thermogravimetry analysis (TG) revealed the copolymers composition and was capable to show the deleterious effect of an excess of Sn(Oct)(2) in the polymer thermal stability, while Differential Scanning Calorimetry (DSC) allowed the observation of the miscibility between the PLLA and PEG segments in the different copolymers.