COLORIMETRIC STUDY OFMUTUAL SYNERGETICS OF BIO-BASED PVC THERMAL STABILIZERS

Abstract

Colorimetric analysis was employed to determine whether a synergistic effect occurs when calcium and aluminum carboxylates synthesized as thermal stabilizers are used in combination to enhance the thermal stability of polyvinyl chloride (PVC)-based composite materials. For comparative evaluation, a commercial NV-brand Ca/Zn stearate-based thermal stabilizer was used as a reference. The results indicated that both bio-based thermal stabilizers improved the long-term thermal stability of the polymer; however, they did not exert a significant influence on the initial color characteristics. The chemical compatibility of the thermal stabilizers with PVC was evaluated by assessing the flow behavior of the melt blends. The findings demonstrated a high degree of compatibility between aluminum carboxylate and PVC, whereas the commercial thermal stabilizer led to phase separation.