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Effect of lanthanum cyanurate as novel organic thermal stabilizers for polyvinyl chloride
Author(s) -
Li Mei,
Jiang Zaiyong,
Liu Zhaogang,
Hu Yanhong,
Wang Mitang,
Wang Haiou
Publication year - 2013
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.23419
Subject(s) - zinc stearate , lanthanum , calcium stearate , materials science , stabilizer (aeronautics) , thermal stability , zinc , nuclear chemistry , stearate , polyvinyl chloride , polymer chemistry , inorganic chemistry , chemistry , organic chemistry , composite material , metallurgy , raw material , mechanical engineering , engineering
Lanthanum cyanurate was synthesized by reacting cyanuric acid and lanthanum nitrate at basic condition and was characterized by elemental analysis and Fourier transform infrared spectroscopy. Its application as thermal stabilizer for poly(vinyl chloride) (PVC) was investigated by Congo red test and discoloration test. In comparison with other heat stabilizers, including lanthanum stearate, calcium stearate, and zinc stearate, lanthanum cyanurate exhibits high stabilizing effect with excellent initial color of PVC. The stability time reaches the maximum (80 min) when the percentage of lanthanum cyanurate in PVC is 2.5%. The combination stabilizers (LaC 3 N 3 O 3 /Zn(St) 2 obviously increase the complete discoloration time of PVC in comparison with the stabilizer of Zn(St) 2 . The stability time of PVC increases from 14 min (stabilized by zinc stearate) to 26 min (stabilized by LaC 3 N 3 O 3 /Zn(St) 2 ). LaC 3 N 3 O 3 also shows a slightly stronger effect on tensile strength of PVC than La(St) 3 . Therefore, the LaC 3 N 3 O 3 can be used to replace La(St) 3 and serve as a costabilizer to improve stabilization efficiency of calcium/zinc stabilizers for PVC. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers