Abstract
Three new tetra-Schiff bases were synthesized and characterized to be used as photostabilizers for poly(vinyl chloride) (PVC) films. The photostability of PVC films (40 μm thickness) in the presence of Schiff bases (0.5 wt %) upon irradiation (300 h) with a UV light (λmax = 365 nm and light intensity = 6.43 × 10−9 ein∙dm−3∙s−1) was examined using various spectroscopic measurements and surface morphology analysis. The changes in various functional groups’ indices, weight and viscosity average molecular weight of PVC films were monitored against irradiation time. The additives used showed photostability for PVC films, with Schiff base 1 being the most effective additive upon irradiation, followed by 2 and 3. The atomic force microscopy (AFM) images for the PVC surface containing Schiff base 1 after irradiation were found to be smooth, with a roughness factor (Rq) of 36.8, compared to 132.2 for the PVC (blank). Several possible mechanisms that explain PVC photostabilization upon irradiation in the presence of tetra-Schiff bases were proposed.
Highlights
IntroductionPolymeric materials are produced in huge quantity and are used in everyday applications
Polymeric materials are produced in huge quantity and are used in everyday applications.Polyethylene, polypropylene and poly(vinyl chloride) (PVC) are the most produced and used polymers as plastics
We report the successful synthesis of three tetra-Schiff bases, using a simple and
Summary
Polymeric materials are produced in huge quantity and are used in everyday applications. The PVC photodegradation process can lead to dehydrochlorination and the formation of conjugated double bonds [9] This is possibly due to impurities during the synthesis process [10], average molecular weight reduction and crosslinking [11,12]. We report the successful synthesis of three tetra-Schiff bases, using a simple and efficient procedure, and investigate their PVC photostabilization efficiency as a continuation of our efficient procedure, and investigate their PVC photostabilization efficiency as a continuation of our own interest in polymeric materials [35,36,37,38,39,40,41]. The synthesized Schiff bases have been proven to be efficient stabilizers against the photodegradation of PVC samples.
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