An ESR study of the radiolysis of semi-crystalline ethylene-propylene copolymers containing DOP mobilizer

Fuzail, M., Hill, D. J. T. and Le, T. T. (2006) An ESR study of the radiolysis of semi-crystalline ethylene-propylene copolymers containing DOP mobilizer. Journal of Applied Polymer Science, 99 3: 638-643.


Author Fuzail, M.
Hill, D. J. T.
Le, T. T.
Title An ESR study of the radiolysis of semi-crystalline ethylene-propylene copolymers containing DOP mobilizer
Journal name Journal of Applied Polymer Science   Check publisher's open access policy
ISSN 0021-8995
Publication date 2006
Sub-type Article (original research)
DOI 10.1002/app.22398
Volume 99
Issue 3
Start page 638
End page 643
Total pages 6
Place of publication Hoboken, USA
Publisher Wiley
Collection year 2006
Language eng
Subject C1
250502 Physical Chemistry of Macromolecules
780103 Chemical sciences
Abstract The radiolysis of a poly(ethylene-co-propylene), Elpro, marketed by Thai Polypropylene Co. Ltd for the manufacture of medical goods has been investigated at 77 K. Calcium stearate was blended with the Elpro as a processing aid; and dioctyl phthalate, DOP, was added in various amounts as a radiation stabilizer. The ESR spectra of Elpro and Elpro+Ca were very similar and characterized principally by the presence of PP a-carbon radicals. The spectra of the samples containing DOP were similar to those for Elpro but with an additional narrow singlet arising from DOP radicals. On annealing the irradiated polymers to higher temperatures, the singlet was lost between 250 and 270 K, and at room temperature the principal radicals remaining were allyl radicals. The G-values for radical formation at 77 K for Elpro and Elpro+Ca at 77 K were 3.0 and 3.2, respectively, but incorporation of DOP resulted in lower G-values, ranging from 1.6 to 1.4 for 0.5 and 2.5 phr DOP, respectively.(c) 2005 Wiley Periodicals, Inc.
Keyword Polymer Science
Esr
G-value
Gamma Radiation
Mobilizer
Poly(ethylene-co-propylene)
Radical
Irradiated Isotactic Polypropylene
Electron-spin-resonance
Q-Index Code C1

 
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