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
Sub-type Article (original research)
DOI 10.1016/0141-3910(95)00150-6
Volume 50
Issue 3
Start page 297
End page 304
Total pages 8
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.
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
 
Versions
Version Filter Type
Citation counts: Scopus Citation Count Cited 41 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Tue, 30 Aug 2016, 14:10:02 EST by System User