title: Photostabilizing Efficiency of PVC in the Presence of Schiff Bases as Photostabilizers.
abstract: The photostabilization of polyvinyl chloride (PVC) films by Schiff bases was investigated. Polyvinyl chloride films containing 0.5 wt % Schiff bases were produced using the same casting method as that used for additive-free PVC films 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 monitored using THF as a solvent. The quantum yield of chain scission (Φcs) for the studied complexes in PVC was estimated to range between 4.72 and 8.99 × 10(-8). According to the experimental results, several mechanisms were suggested, depending on the structure of the additive. Ultra violet (UV) absorption, peroxide decomposition and radical scavenging were suggested as the photostabilizing mechanisms.
authors.affiliation: Department of Chemistry, College of Science, Al-Nahrain University, Baghdad 10072, Iraq. emad_yousif@hotmail.com.
authors.forename: Emad
authors.initials: E
authors.lastname: Yousif
authors.affiliation: Environmental Research Center, University of Technology (UOT), Baghdad 10001, Iraq. dr.ahmed1975@gmail.com.|Department of Chemical & Process Engineering, University Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia. dr.ahmed1975@gmail.com.
authors.forename: Ahmed A
authors.initials: AA
authors.lastname: Al-Amiery
authors.affiliation: Department of Laser and Optoelectronics, University of Technology (UOT), Baghdad 10001, Iraq. abdulhadikadhim5@gmail.com.
authors.forename: Abdulhadi
authors.initials: A
authors.lastname: Kadihum
authors.affiliation: Department of Chemical & Process Engineering, University Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia. amir@eng.ukm.my.
authors.forename: Abdul Amir H
authors.initials: AA
authors.lastname: Kadhum
authors.affiliation: Department of Chemical & Process Engineering, University Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia. drab@eng.ukm.my.|Fuel Cell Institute, University Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia. drab@eng.ukm.my.
authors.forename: Abu Bakar
authors.initials: AB
authors.lastname: Mohamad
mesh_terms: D008970:Molecular Weight; D010777:Photochemistry; D010782:Photolysis; D011143:Polyvinyl Chloride / Q000737:chemistry*; D012545:Schiff Bases; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D012545:Schiff Bases; D011143:Polyvinyl Chloride
keywords: UV absorber; UV-Vis spectroscopy; photochemistry; photostabilizer; polyvinyl chloride (PVC)