Preparation of Zinc–Lanthanum and Zinc–Aluminum–Lanthanum Layered Double Hydroxides and Analysis of Their Thermal Stabilization Mechanism on PVC

IF 1.8 3区 化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR
Jinsheng Duan, Peijie Jia, Zhaogang Liu, Yilin Li, Yanhong Hu, Jinxiu Wu, Jianfei Li, Xiaowei Zhang
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Abstract

Zinc–lanthanum layered double hydroxides (Zn–La LDHs) and zinc–aluminum–lanthanum layered double hydroxides (Zn–Al–La LDHs) were prepared via a hydrothermal method. The effects of cation ratio, hydrothermal time, and hydrothermal temperature on the structure of these two types of layered double hydroxides (LDHs) and their thermal stability in polyvinyl chloride (PVC) were investigated. The optimal preparation conditions were determined to be n(M2+) : n(M3+) = 3 : 1, hydrothermal temperature of 170°C, and hydrothermal time of 8 h. The LDHs obtained under optimal conditions were characterized by X-ray powder diffraction, Fourier-transform infrared spectroscopy (FTIR), and thermal analysis. The effects of different preparation conditions of the LDHs on the thermal stability of PVC were studied through Congo red tests and high-temperature aging experiments. The results indicate that both types of LDHs significantly improve the thermal stability of PVC, with Zn–La LDHs exhibiting superior thermal stability compared to Zn–Al–La LDHs. The rare earth LDH thermal stabilizers inhibit the cleavage of C–Cl and C–H bonds in PVC, suppress the generation of HCl and C=C bonds, and reduce the catalytic effect of HCl on the degradation of PVC.

Abstract Image

锌-镧和锌-铝-镧层状双氢氧化物的制备及其在PVC上的热稳定机理分析
采用水热法制备了锌镧层状双氢氧化物(Zn-La LDHs)和锌铝镧层状双氢氧化物(Zn-Al-La LDHs)。研究了阳离子比、水热时间和水热温度对这两种层状双氢氧化物(LDHs)结构及其在聚氯乙烯(PVC)中的热稳定性的影响。确定了最佳制备条件为n(M2+): n(M3+) = 3:1,水热温度为170℃,水热时间为8 h。采用x射线粉末衍射、傅里叶红外光谱(FTIR)和热分析对最佳条件下得到的LDHs进行了表征。通过刚果红试验和高温老化实验,研究了不同制备条件对聚氯乙烯热稳定性的影响。结果表明,两种类型的LDHs均能显著提高PVC的热稳定性,其中Zn-La LDHs的热稳定性优于Zn-Al-La LDHs。稀土LDH热稳定剂抑制PVC中C - cl和C - h键的裂解,抑制HCl和C=C键的生成,降低HCl对PVC降解的催化作用。
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来源期刊
Russian Journal of Inorganic Chemistry
Russian Journal of Inorganic Chemistry 化学-无机化学与核化学
CiteScore
3.10
自引率
38.10%
发文量
237
审稿时长
3 months
期刊介绍: Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.
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