The Malaysian Journal of Analytical Sciences Vol 15 No 1 (2011): 81 92

 

 

 

IMPROVEMENT OF THE PHOTOSTABILIZATION OF PVC FILMS IN THE PRESENCE OF THIOACETIC ACID BENZOTHIAZOLE COMPLEXES

 

Emad Yousif1*, Jumat Salimon2, Nadia Salih2

 

1Department of Chemistry,

College of Science, Al-Nahrain University, Baghdad, Iraq

2School of Chemical Sciences and Food Technology,

Faculty of Science and Technology, Universiti Kebangsaan Malaysia,

43600 Bangi, Selangor, Malaysia

 

*Corresponding author: emad_yousif@hotmail.com

 

 

Abstract

The photostabilization of poly(vinyl chloride) (PVC) films by 2-thioacetic acid benzothiazol with Sn(II), Cd(II), Ni(II), Zn(II) and Cu(II) complexes was investigated. The PVC films containing concentration of complexes 0.5% by weight were produced by the same casting method from tetrahydrofuran (THF) solvent. The photostabilization activities of these compounds were determined by monitoring the carbonyl, polyene and hydroxyl indices with irradiation time. The changes in viscosity average molecular weight of PVC with irradiation time were also tracked (using THF as a solvent). The quantum yield of the chain scission (φcs) of these complexes in PVC films was evaluated and found to range between 4.7110-8 and 8.9810-8. Results obtained showed that the rate of photostabilization of PVC in the presence of the additive follows the trend:

 

Sn(L)2 > Cd(L)2 > Ni(L)2 > Zn(L)2 > Cu(L)2

 

According to the experimental results obtained, several mechanisms were suggested depending on the structure of the additive. Among them HCl scavenging, UV absorption, peroxide decomposer and radical scavenger for photostabilizer additives mechanisms were suggested.

 

Keywords: Photostabilizer, PVC, 2-Thioacetic benzothiazol acid.

 

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