Synthesis of 4-arm star poly(L-Lactide) oligomers using an in situ-generated calcium-based initiator


Autoria(s): George, Karina A.; Schue, Francois; Chirila, Traian; Wentrup-Byrne, Edeline
Data(s)

15/09/2009

Resumo

Using an in situ-generated calcium-based initiating species derived from pentaerythritol, the bulk synthesis of well-defined 4-arm star poly(L-lactide) oligomers has been studied in detail. The substitution of the traditional initiator, stannous octoate with calcium hydride allowed the synthesis of oligomers that had both low PDIs and a comparable number of polymeric arms (3.7 – 3.9) to oligomers of similar molecular weight. Investigations into the degree of control observed during the course of the polymerization found that the insolubility of pentaerythritol in molten L-lactide resulted in an uncontrolled polymerization only when the feed mole ratio of L-lactide to pentaerythritol was 13. At feed ratios of 40 and greater, a pseudo-living polymerization was observed. As part of this study, in situ FT-Raman spectroscopy was demonstrated to be a suitable method to monitor the kinetics of the ring-opening polymerization (ROP) of lactide. The advantages of using this technique rather than FT-IR-ATR and 1H NMR for monitoring L-lactide consumption during polymerization are discussed.

Formato

application/pdf

Identificador

http://eprints.qut.edu.au/29116/

Publicador

John Wiley & Sons

Relação

http://eprints.qut.edu.au/29116/1/c29116.pdf

DOI:10.1002/pola.23527

George, Karina A., Schue, Francois, Chirila, Traian, & Wentrup-Byrne, Edeline (2009) Synthesis of 4-arm star poly(L-Lactide) oligomers using an in situ-generated calcium-based initiator. Journal of Polymer Science Part A: Polymer Chemistry, 47(18), pp. 4736-4748.

Direitos

Copyright 2009 Wiley-Blackwell

Fonte

Chemistry; Faculty of Science and Technology; Institute of Health and Biomedical Innovation

Palavras-Chave #030305 Polymerisation Mechanisms #030306 Synthesis of Materials #poly(L-lactide) #star polymers #Raman spectroscopy #kinetics (polym.) #heterogeneous polymerization
Tipo

Journal Article