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An electron spin resonance study on y-irradiated poly(L-lactic acid)and poly(D,L-lactic acid)

Tipo de material: TextoTextoSeries ; Polymer Degradation and Stability, 50, p.297-304, 1995Trabajos contenidos:
  • Babanalbandi, A
  • Hill, D. J. T
  • O'Donnell, J. H
  • Pomery, P. J
  • Whittaker, A
Recursos en línea: Resumen: The effect of gamma irradiation on poly(L-lactic acid)(L-PLA)and poly(~,~- lactic acid)(D,L-PLA), has been examined using ESR spectroscopy and through analysis of the changes in molecular weight. The G values for radical formation of both polylactic acids have been calculated at 77 and 300 K; G(R)=2-O at 77 K and G(R)= 1.5 at 300 K for L-PLA and G(R)= 2.4 at 77 K and G(R)= 1.2 at 300 K for D,L-PLA. The ESR spectrum at 300 K for the polymers was assigned to one radical, resulting from H atom abstraction from the quaternary carbon atom. The G values for crosslinking and scission have also been determined for the polymers at 300 K; G(S)= 2.3 and G(X)= 0.0 for D,L-PLA, G(S)= 2.4 and G(X)= 0.28 for L-PLA.
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The effect of gamma irradiation on poly(L-lactic acid)(L-PLA)and poly(~,~- lactic acid)(D,L-PLA), has been examined using ESR spectroscopy and through analysis of the changes in molecular weight. The G values for radical formation of both polylactic acids have been calculated at 77 and 300 K; G(R)=2-O at 77 K and G(R)= 1.5 at 300 K for L-PLA and G(R)= 2.4 at 77 K and G(R)= 1.2 at 300 K for D,L-PLA. The ESR spectrum at 300 K for the polymers was assigned to one radical, resulting from H atom abstraction from the quaternary carbon atom. The G values for crosslinking and scission have also been determined for the polymers at 300 K; G(S)= 2.3 and G(X)= 0.0 for D,L-PLA, G(S)= 2.4 and G(X)= 0.28 for L-PLA.

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