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Organic thermal stabilizers for rigid poly(vinyl chloride) IX. N-Benzoyl-N′-p-substituted phenylthiourea derivatives by Magdy W. Sabaa; Riham R. Mohamed; Ahmady A. Yassin is a Materials Science article available to read on EtoBox.

What is Organic thermal stabilizers for rigid poly(vinyl chloride) IX. N-Benzoyl-N′-p-substituted phenylthiourea derivatives about?

N-Benzoyl-N 0 -p-substituted phenylthiourea derivatives have been investigated as thermal stabilizers or co-stabilizers for rigid PVC at 180 C in air. The results reveal the higher stabilizing potency of the investigated organic stabilizers as compared with some of the commercially known reference stabilizers, which is proved by their greater induction period values (Ts), during which no detectable amount of hydrogen chloride gas could be detected, but with higher dehydrochlorination rate at the later stages of degradation. Complexation of these materials with the chlorides of Ni 2+ and Cd 2+ improved greatly the induction period values, however the dehydrochlorination rate is only slightly improved. On the other hand, blending these thermal stabilizers with some of the commercially known reference stabilizers in different proportions leads to a true synergistic effect. The induction period values and the degradation rate were remarkably improved. A probable ionic mechanism for the stabilizing action of N-Benzoyl-N 0 -psubstituted phenylthiourea derivatives is proposed. The stabilizing efficiency is attributed to the replacement of the labile chloride ions on the PVC chains by a re

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Author

Magdy W. Sabaa; Riham R. Mohamed; Ahmady A. Yassin

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0141-3910)

Published

2003

Language

EN

Field

Materials Science (Physical Sciences)