Lanthanum histidine with pentaerythritol and zinc stearate as thermal stabilizers for poly(vinyl chloride)

Abstract

ABSTRACTLanthanum histidine [La(His)2·(NO3)·2H2O or La(His)2] was synthesized via the reaction of histidine and lanthanum nitrate, and it was investigated as a stabilizer for poly(vinyl chloride) (PVC). The results show that La(His)2 exhibited a stabilizing effect on PVC as a long‐term stabilizer because it prolonged the stability time of PVC to 76 min, which was about 24 times longer than the stability time of the pure PVC. The stabilizing effect of La(His)2 as a costabilizer with pentaerythritol (Pe) and zinc stearate (ZnSt2) was also studied. The results show that the use of La(His)2 with Pe or Pe/ZnSt2 improved the stability time of PVC. La(His)2/Pe/ZnSt2 provided PVC with a good initial color and long‐term stability, and when it was prepared at mass ratios of 0.8:2.4:0.8 and 1.6:1.6:0.8, the stability times of PVC were improved to 86 and 88 min, respectively. As a nontoxic stabilizer, La(His)2/Pe/ZnSt2 has the potential to replace the toxic stabilizers widely used in PVC manufacturing. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 42878.