N-(Substituted phenyl) itaconimides as organic stabilizers for plasticized poly(vinyl chloride) against photo-degradation

Several N-(substituted phenyl)itaconimide derivatives, N-(RPh)II (R: –NO 2, –COOH, –H, –OH, –OMe, –Me, –Cl, or –Br), have been investigated as organic photo-stabilizers for poly(vinyl chloride) (PVC) plasticized with dioctyl phthalate (DOP). Their stabilizing efficiencies are evaluated by measuring...

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Bibliographic Details
Published in:Polymer degradation and stability 2007-04, Vol.92 (4), p.733-740
Main Authors: Fahmi, Mona Mohamed, Mohamed, Nadia Ahmed
Format: Article
Language:English
Subjects:
Applied sciences
Compounding ingredients
Cross-linking
Discolouration
Exact sciences and technology
Organic photo-stabilizers
Photo-dehydrochlorination
Plasticized poly(vinyl chloride)
Polymer industry, paints, wood
Stabilization mechanism
Stabilizers (antioxydants, antiozonants, etc.)
Technology of polymers
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Summary:Several N-(substituted phenyl)itaconimide derivatives, N-(RPh)II (R: –NO 2, –COOH, –H, –OH, –OMe, –Me, –Cl, or –Br), have been investigated as organic photo-stabilizers for poly(vinyl chloride) (PVC) plasticized with dioctyl phthalate (DOP). Their stabilizing efficiencies are evaluated by measuring the length of the induction period (Ts), the period during which no detectable amounts of hydrogen chloride gas could be observed, and also from the rate of dehydrochlorination as measured by continuous potentiometric determination, and the extent of discolouration of the degraded polymer. The efficiencies are also evaluated by determining the amount of gel formation as well as the intrinsic viscosity of the insoluble and the soluble fractions of the degraded polymer, respectively. The results have proved the greater stabilizing efficiency of the N-(RPh)II derivatives relative to that of the phenyl salicylate UV absorber which is a commonly used industrial stabilizer. A radical mechanism is proposed to account for the stabilizing action of the investigated products.
ISSN:0141-3910
1873-2321
DOI:10.1016/j.polymdegradstab.2006.11.019