A novel polyol compound, N-(1,1-hydroxymethyl-2-hydroxyethyl) maleamic acid(MT), was synthesized using maleic anhydride and tris(hydroxymethyl) aminomethane(Tris), and was investigated as an auxiliary thermal stabilizer for rigid poly(vinyl chloride)(PVC). The results of static-aging and dehydrochlorination tests show that, MT is more effective a PVC co-stabilizer with long-term thermal stability than the typical polyol co-stabilizers(pentaerythritol(PER) and Tris). The zinc burning time reach 80, 130 and 2...