An electron spin resonance study on γ-irradiated poly(l-lactic acid) and poly(d,l-lactic acid)

Babanalbandi A., Hill D.J.T., O'Donnell J.H., Pomery P.J. and Whittaker A. (1995) An electron spin resonance study on γ-irradiated poly(l-lactic acid) and poly(d,l-lactic acid). Polymer Degradation and Stability, 50 3: 297-304. doi:10.1016/0141-3910(95)00150-6


Author Babanalbandi A.
Hill D.J.T.
O'Donnell J.H.
Pomery P.J.
Whittaker A.
Title An electron spin resonance study on γ-irradiated poly(l-lactic acid) and poly(d,l-lactic acid)
Journal name Polymer Degradation and Stability   Check publisher's open access policy
ISSN 0141-3910
Publication date 1995-01-01
Year available 1995
Sub-type Article (original research)
DOI 10.1016/0141-3910(95)00150-6
Open Access Status Not yet assessed
Volume 50
Issue 3
Start page 297
End page 304
Total pages 8
Place of publication OXFORD
Publisher ELSEVIER SCI LTD
Language eng
Subject 2211 Mechanics of Materials
2505 Materials Chemistry
2507 Polymers and Plastics
3104 Condensed Matter Physics
1605 Policy and Administration
Abstract The effect of gamma irradiation on poly(l-lactic acid) (l-PLA) and poly(d,l-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) = 2.0 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.
Keyword Degradation
Surgery
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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