The effect of stabilisers on integrated chemiluminescence in the early stages of polypropylene photo-oxidation

George G.A. and Ghaemy M. (1991) The effect of stabilisers on integrated chemiluminescence in the early stages of polypropylene photo-oxidation. Polymer Degradation and Stability, 34 1-3: 37-53. doi:10.1016/0141-3910(91)90110-D


Author George G.A.
Ghaemy M.
Title The effect of stabilisers on integrated chemiluminescence in the early stages of polypropylene photo-oxidation
Journal name Polymer Degradation and Stability   Check publisher's open access policy
ISSN 0141-3910
Publication date 1991-01-01
Sub-type Article (original research)
DOI 10.1016/0141-3910(91)90110-D
Volume 34
Issue 1-3
Start page 37
End page 53
Total pages 17
Subject 1605 Policy and Administration
2507 Polymers and Plastics
Abstract The integrated chemiluminescence obtained by heating photo-oxidised polypropylene films in an inert atmosphere is affected by a number of common stabilisers, particularly free radical scavengers, such as hindered phenols, and hydroperoxide decomposers, such as thiodipropionate esters. These stabilisers must be removed prior to chemiluminescence analysis of the hydroperoxide content in the early stages of photo-oxidation. From an analysis of the effect of stabilisers on the peak in hydroperoxide concentration observed after short times of UV irradiation with wavelengths longer than 300 nm, it was found that only the thiodipropionate ester and a 2-hydroxybenzophenone UV absorber affected the kinetics of hydroperoxide formation and decomposition and increased the induction period as measured by carbonyl index. A hindered triphenyl phosphite produced an immediate increase in integrated chemiluminescence and was a pro-degradant unless a hindered phenol was incorporated to inhibit peroxy radical attack on the stabiliser. A commercial hindered piperidine caused a lowering of the chemiluminescence when the sample was heated for analysis, consistent with a weak radical scavenging and hydroperoxide-decomposing activity of the amine, but did not affect the kinetics of formation and decomposition of hydroperoxides on UV irradiation.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

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