عنوان المقالة:Synthesis and characterization of gallic acid derivatives and their utilized as organic photo-stabilizers for poly (vinyl chloride) Synthesis and characterization of gallic acid derivatives and their utilized as organic photo-stabilizers for poly (vinyl chloride)
Ivan Hameed R. Tomi & Gassan Q. Ali & Alaa H. Jawad & Emad Yousif
English Authors
Ivan Hameed R. Tomi & Gassan Q. Ali & Alaa H. Jawad & Emad Yousif
Abstract
Abstract The photo-stabilization of poly (vinyl chloride)
containing 1,3,4-thiadiazole derivatives derived from Gallic
acid as additives were studied. The four different substituents
of 1,3,4-thiadiazole-gallic derivatives, 2-(4-substituted-phenyl)-5-(3,4,5-trimethoxyphenyl)-1,3,4-thiadiazole,
(R1-R4)
were prepared starting from Gallic acid and characterized by
FTIR, 1
HNMR and elemental analysis. The 5% concentration
by weight of these derivatives (R1-R4) in PVC polymer was
used to study the photo-stabilization of PVC. The photostabilization
of PVC films were studied at room temperature
under irradiation of U.V light with λ = 385 nm and an intensity
of 7.75 × 10−7 Einstein dm−3 s
−1
. The photo-stabilization
activity of these compounds was determined by monitoring
the carbonyl (ICO), polyene (Ipo) and hydroxyl (IOH) indices
and weight loss method with irradiation time. It was found that
the (ICO), (Ipo) and (IOH) index values increased with the irradiation
time increase, this increase found to depend on the
type of additives, also it was found that the PVC films in the
presence of additives (R1-R4) were arranged as the following
trend: PVC + R1 > PVC + R2 > PVC + R3 > PVC + R4.
غسان قيس علي | Ghassan Qays Ali | 4451