Biobased Zinc Arginine Stearate/Layered Double Hydroxide Multi-mechanism Thermal Stabilizer for Improving PVC Performance

Document Type : Research Paper

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Polymer Chemistry Research Laboratory, Department of Chemistry, University of Isfahan, 81746-73441, Isfahan, Iran

Abstract

Hypothesis: Considering the detrimental impact of conventional thermal stabilizers for polyvinyl chloride (PVC) on the environment, this research proposes a novel green multi-mechanistic thermal stabilizer for PVC. This stabilizer is synthesized from a combination of zinc arginine stearate (ZnArgSt) and layered double hydroxide (LDH). The study aims to investigate the combined effects of these components on the thermal stability and mechanical properties of PVC 
Methods: The ZnArgSt was synthesized through the reaction of zinc acetate and arginine, while LDH was synthesized from aluminum nitrate-nonahydrate and magnesium nitrate-hexahydrate. The effects of each component individually, as well as their combination, were compared regarding their influence on PVC properties The impact of these materials on the thermal stability and mechanical performance of PVC was assessed using various tests including the following: visual color change assessments in an oven at 180 oC to evaluate the color durability of PVC
thermogravimetric analysis (TGA); Congo Red test to determine the release of HCl gas during degradation; UV-Vis spectroscopy to quantify the formation of unsaturated bonds resulting from HCl elimination; differential scanning calorimetry (DSC) Shore-A hardness; and tensile testing
Findings: The results obtained from the tests indicated that this stabilizer exhibits a high capacity for absorbing HCl gas generated from the degradation of the polymer PVC samples containing LDH+ZnArgSt demonstrated improvements of 34% in toughness, 11% in modulus, and 3.5% in hardness compared to PVC with LDH alone Furthermore, compared to PVC containing only ZnArgSt, enhancements of 20% 33%, and 3.5% in mechanical properties were observed, respectively.

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