Abstract
Biologically active N-benzoyl-4-(N-maleimido)-phenylhydrazide (BMPH) was synthesized and its structure was confirmed by elemental analysis and various spectral tools. It was examined as a thermal stabilizer and co-stabilizer for rigid poly (vinyl chloride) at 180 °C in air. Blending BMPH with reference samples in different ratios greatly lengthens the thermal stability value and improves the extent of discoloration of PVC. TGA confirmed the improved stability of PVC in presence of the investigated organic stabilizer. GPC measurements were done to investigate the changes occurred in the molecular masses of the degraded samples of blank PVC and PVC in presence of the novel stabilizer. BMPH showed good antimicrobial activity towards two kinds of bacteria and two kinds of fungi.
Highlights
It is generally known that poly, PVC, is an unstable polymer when exposed to high temperatures during its molding and applications
The results of the non-stabilized blank PVC as well as those of the samples stabilized by dibasic lead carbonate (DBLC) and Ca–Zn stearate used as reference stabilizers are given for comparison
The results reveal that BMPH exhibits a greater stabilizing efficiency than those of the two reference stabilizers, which is shown by the longer thermal stability value (Ts) during which no detectable amounts of hydrogen chloride gas are liberated (Table 1)
Summary
It is generally known that poly (vinyl chloride), PVC, is an unstable polymer when exposed to high temperatures during its molding and applications. PVC undergoes extensive autocatalytic dehydrochlorination with formation of conjugated double bonds [1]. This in turn leads to unacceptable discoloration of the polymer and changes in its physical and mechanical properties [2,3,4], together with a decrease or an increase in its average molecular weight as a result of chain scission or crosslinking. Stabilization of PVC against thermal degradation is essential for its processing and use at high temperatures. The thermal stabilizers commonly in use for the stabilization of PVC are either basic lead salts [10], which can react with the evolved HCl gas, retarding its deleterious catalytic action, metallic soaps [11] and esters or mercaptides of dialkyltin [12] that can exchange the labile chlorine in the backbone chains for other more stable ester or mercaptide groups derived from the stabilizer
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