Synthesis of the complex of lanthanum (III) with N-(2-amino ethyl) maleamic acid radical and its application to PVC as thermal stabilizer

Li, Miao; Liang, Yao-Dong; Wang, Xiaobin; Li, Kanshe; Liu, Xiang-rong

doi:10.1016/j.polymdegradstab.2015.12.002

Cited by 22 publications

(16 citation statements)

References 33 publications

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“…As shown in Fig. , it is observed that there exists a two‐step thermal degradation of PVC; the first of which is due to dehydrochlorination with subsequent formation of conjugated polyenes, and the other is attributed to scission of polyene sequences to low‐molecular‐weight hydrocarbons of linear or cyclic structure .…”

Section: Resultsmentioning

confidence: 99%

“…The stage of thermal weight loss which occurred from room temperature to 400°C is mainly attributed to the elimination of HCl molecules leaving behind longer polyene chains . For the sake of quantificationally evaluating the influence of LaTr, LaTr/Pe, and LaTr/Pe/ZnSt 2 as a stabilizer on thermal stability of PVC, the activation energy values ( E a ) of the first stage for samples stabilized by LaTr, LaTr/Pe, and LaTr/Pe/ZnSt 2 in air atmosphere using Kissinger’ method are calculated and compared . The dependence of the maximum reaction rate on temperature is described in accord with the Kissinger’ method by Eq.…”

Section: Resultsmentioning

confidence: 99%

“…The TGA experiment was performed under air atmosphere. The kinetic parameters such as activation energy ( E a , kJ mol −1 ) were evaluated using Kissinger equation :

\ln ((), \frac{β_{i}}{T_{p}^{2}}) = \ln \frac{A_{a} R}{E_{normala}} - \frac{E_{normala}}{R} \frac{1}{T_{normalp}} ([] i = 1, 2,3,4,5)

where R is the gas constant (8.314 J mol −1 K), T p is the peak temperature on DTA, and β is the heating rate. Equation 1 indicates that ln( β i / T p 2 ) and 1/ T p have a linear correlation.…”

Section: Methodsmentioning

confidence: 99%

“…Among the rare earth stabilizers, organic lanthanum complex stabilizers show higher thermal stability for PVC . Recently, many researchers have taken plenty of time to synthesize lanthanum stabilizers and investigate their thermal stability for PVC . Li et al successfully prepared a basic complex (LaL) by a precipitation method in aqueous solution and used as a stabilizer for PVC.…”

Section: Introductionmentioning

confidence: 99%

“…Li et al successfully prepared a basic complex (LaL) by a precipitation method in aqueous solution and used as a stabilizer for PVC. The results showed that LaL can effectively improve the long‐term thermal stabilizer for PVC . Zhang et al designed and synthesized a lanthanum‐pentaerythritol alkoxide (La‐Pe) by the traditional preparation method.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of lanthanum trioxypurine with zinc stearate and pentaerythritol as complex thermal stabilizers for poly(vinyl chloride)

Guo

et al. 2019

Vinyl Additive Technology

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Lanthanum trioxypurine (LaTr) was triumphantly synthesized by reacting trioxypurine and lanthanum nitrate at neutral condition and was characterized by elemental analysis, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The thermal stability effect of LaTr with its assistant thermal stabilizers about zinc stearate (ZnSt2) and pentaerythritol (Pe) on poly(vinyl chloride) (PVC) was investigated by Congo red test, discoloration test, UV–vis spectroscopy test, and thermal decomposition kinetics. The results showed that the addition of LaTr as thermal stabilizer could significantly enhance static stability time and long‐term stability of PVC. It could be mainly attributed to the anions in the structure of LaTr, could efficiently absorb the hydrogen chloride released by PVC, and have ability to replace unstable chlorine atoms on structure of PVC. Moreover, the mixing of LaTr, Pe, and ZnSt2 could reveal an excellent synergistic effect and both promote the initial color and the long‐term thermal stability of PVC. The thermal stability of PVC reached the optimal state when the ratio of LaTr/Pe/ZnSt2 was 1.8/0.6/0.6. In addition, compared with the reaction energy Ea and UV–vis spectroscopy test's result of PVC samples, the order of PVC's thermal stability was PVC/LaTr/Pe/ZnSt2 > PVC/LaTr/Pe > PVC/LaTr. The result was further ascertained that LaTr/Pe/ZnSt2 showed excellent synergistic effect and could be used as an excellent complex thermal stabilizer for PVC. J. VINYL ADDIT. TECHNOL., 25:347–358, 2019. © 2019 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…The TGA experiment was performed under air atmosphere. The kinetic parameters such as activation energy ( E a , kJ mol −1 ) were evaluated using Kissinger equation :

\ln ((), \frac{β_{i}}{T_{p}^{2}}) = \ln \frac{A_{a} R}{E_{normala}} - \frac{E_{normala}}{R} \frac{1}{T_{normalp}} ([] i = 1, 2,3,4,5)

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation of lanthanum trioxypurine with zinc stearate and pentaerythritol as complex thermal stabilizers for poly(vinyl chloride)

Guo

et al. 2019

Vinyl Additive Technology

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Design of green zinc‐based thermal stabilizers derived from tung oil fatty acid and study of thermal stabilization for PVC

Zhang

Xin

et al. 2016

J of Applied Polymer Sci

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In this study, a new type of mixed calcium (Ca) and zinc (Zn) thermal stabilizers was prepared and evaluated for poly(vinyl chloride) (PVC) thermal stabilization. The mixed stabilizers were based on the Ca and Zn salts of polycarboxylic acid derived from eleostearic acid—the dominant fatty acid of tung oil fatty acids. Eleostearic acid was converted to a 21‐carbon diacid (C21DA) and a 22‐carbon triacid (C22TA), respectively, which were subsequently turned into calcium (Ca) and zinc (Zn) salts. Thermal stability of PVC compounds was examined by thermogravimetric analysis (TGA), discoloration test, Congo red test, and thermal decomposition kinetics. In comparison, commercial mixed Ca/Zn thermal stabilizers composed of stearate salts (CaSt2/ZnSt2), were employed as controls. Because the salts of C21DA, C22TA and stearate have different metal contents, thermal stabilization effects were compared on the basis of both equal salt weight and equal metal ion content. It was noted that under both cases the long‐term thermal stability of the PVC samples followed the order of C21DA‐Ca/C21DA‐Zn > C22TA‐Ca/C22TA‐Zn > CaSt2/ZnSt2. The results suggest that the mixed Ca/Zn salts based on tung oil‐derived polycarboxylic acids have higher metal ion contents and cycloaliphatic structures and can effectively improve the thermal stability of PVC. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44679.

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Synthesis, Characterization, and Reversible Multielectron Redox Properties of a Biradical Yttrium Complex Containing Bis(2‐isopropylaminophenyl)amide

Duan

Jia

et al. 2017

Eur J Inorg Chem

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Synthesis of the complex of lanthanum (III) with N-(2-amino ethyl) maleamic acid radical and its application to PVC as thermal stabilizer

Cited by 22 publications

References 33 publications

Investigation of lanthanum trioxypurine with zinc stearate and pentaerythritol as complex thermal stabilizers for poly(vinyl chloride)

Investigation of lanthanum trioxypurine with zinc stearate and pentaerythritol as complex thermal stabilizers for poly(vinyl chloride)

Design of green zinc‐based thermal stabilizers derived from tung oil fatty acid and study of thermal stabilization for PVC

Synthesis, Characterization, and Reversible Multielectron Redox Properties of a Biradical Yttrium Complex Containing Bis(2‐isopropylaminophenyl)amide

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