TY  - BOOK
AU  - Babanalbandi,A.
AU  - Hill,D.J.T.
AU  - O'Donnell,J.H.
AU  - Pomery,P.J.
AU  - Whittaker,A.
TI  - An electron spin resonance study on y-irradiated poly(L-lactic acid)and poly(D,L-lactic acid)
N2  - 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
UR  - https://drive.google.com/file/d/1C-Z5m7x-72evBp0gF4uMFKMV-SgHTuUE/view?usp=drivesdk
ER  -