IR and Uv-visible study of the thermal stabilization for pvc stabilized with (Ho, Tb and Dy)‎ stearate and synergistic mixtures

الملخص EN

Three types of metal carboxylates (IIo,Tb and Dy) stearates were used as thermal stabilizers for P\'rC'.

Infrared spectra (1500-1900 cm‘؛) were studied for PVC ^ln^s stabilized with these metal earboxylates.

Two types of oxygen were found -containing produets that were formed during the thermal degradation .٠١٦ the other hand , the prcsenec of atmospheric oxygen leading to the formation of carbonyl groups on the chain seems to play a great role in the stabilization of p^c.

It was found that IR spcctroscopy was suitable to follow the consumption of the earbox>’lates within the thermal stress periods via antisymmetrical stretching vibration of coo.

The thermal stability for the PVC in present of synergistic mixtures (Ho-Tb,Ho-Dy and Tb-Dv) stearates was studied by Ultraviolet-visible spectra.The results indicate that these mixtures have eonsiderable stabilization efficiency for the PVC.sz