Photostability Study of Some Modified Poly(vinyl chloride) Containing Pendant Schiff’s Bases

Abstract

The polymers modified Poly(vinyl chloride) differ in their tendency to photo oxidation comparing with that unmodified. It has been studied Photostability for modified Poly(vinyl chloride) chains using Schiff’s bases derivative of (5-amino-1, 3, 4-thiadiazole-2-thiol) in a manner casting of plastic chips with thickness (40) in a solvent Tetrahydrofuran. It has been determined the effectiveness Photostability of these modified polymers through the photo degradation rate constant for photostabilizer (kd) for the modified Poly (vinyl chloride). Attributed efficiency of these Poly(vinyl chloride) chips in Photostability by replace the atom Cl Poly(vinyl chloride) chains ends more stable than light stabilizer.

Poly(vinyl Chloride) Photostabilization in the Presence of Schiff Bases Containing a Thiadiazole Moiety

“…Schiff bases 1 – 5 ( Figure 2 ) were obtained based on a procedure from the literature [ 51 ]. Reaction of an equimolar mixture of 5-amino-1,3,4-thiadiazole-2-thiol and a number of carbonyl compounds in anhydrous ethanol in acidic medium (acetic acid) under reflux for 2.5 to 4 h gave the crude products.…”

“…Reaction of an equimolar mixture of 5-amino-1,3,4-thiadiazole-2-thiol and a number of carbonyl compounds in anhydrous ethanol in acidic medium (acetic acid) under reflux for 2.5 to 4 h gave the crude products. Crystallization of the crude product using ethanol gave pure Schiff bases 1 – 5 in 79–88% yields [ 51 ]. The color of Schiff bases 1 – 5 ranged from colorless to orange.…”

“…Schiff bases 1 – 5 ( Figure 2 ) was obtained using a reported procedure [ 51 ] and their structures were confirmed by IR, UV, 1 H-NMR, and mass spectra.…”

Fabrication of ordered honeycomb porous poly(vinyl chloride) thin film doped with a Schiff base and nickel(II) chloride

“…Schiff base ( Fig. 1 ) was synthesized, as a white solid in 83% yield, as previously reported from the reaction of an equimolar mixture of 5-amino-1,3,4-thiadiazole-2-thiol and 2-carboxybenzaldehyde in refluxing ethanol for 2.5 h in the presence of acetic acid as a catalyst [41] . The structure of the Schiff base was confirmed and its spectroscopic data were consistent with those reported [42] .…”

A Spectral, Optical, Microscopic Study, Synthesis and Characterization of PVC Films Containing Schiff Base Complexes

“…PVC solution (0.5% concentration) in THF was used to synthesize 40 µm thickness of polymeric films. The films were prepared by pouring the solution onto a glass plate, left to dry for a day to remove any residual of THF (12)(13)(14).…”