Preparation， thermal stability and antibacterial properties of pentaerythritol fumarate⁃based lanthanum rare earth compounds for use in PVC

doi:10.19491/j.issn.1001-9278.2025.01.002

Abstract

Abstract:

A rare earth compound， fumaric acid pentaerythritol lanthanum （FGPE⁃La）， was synthesized using fumaric acid， pentaerythritol， and lanthanum acetate as raw materials. The chemical structure and composition of the resultant FGPE⁃La were characterized， and its thermal stability and antibacterial properties when used in PVC were investigated. The results indicated that FGPE⁃La could be used as a multifunctional PVC additive with both good thermal stability and antibacterial properties. When a mixer of FGPE⁃La and ZnSt2 at a mass ratio of 3：1 was used for PVC， good initial whiteness and long⁃term thermal stability could be obtained in the modified PVC. Moreover， the thermal stability time of the modified PVC reaches 68 minutes when 4 phr FGPE⁃La was incorporated alone， indicating a significant improvement in the long⁃term stability. An antibacterial rate of 99.1 % was achieved for the modified PVC containing 6 wt.% FGPE⁃La， and its hemolysis rate was only 4.6 %， indicating good biocompatibility.

Key words: fumaric acid, pentaerythritol, rare earth compounds, thermal stability, antibacterial property

CLC Number:

TQ325.3

CHEN Mingguang, LI Mengdi, YU Chen, CAO Hongzhang, YU Xiaoli, LIU Zhaogang, LUO Guoping. Preparation， thermal stability and antibacterial properties of pentaerythritol fumarate⁃based lanthanum rare earth compounds for use in PVC[J]. China Plastics, 2025, 39(1): 6-12.

Figures/Tables 13

Fig.1. Synthetic routes of FGPE⁃La

Fig.2. FTIR of FGPE and FGPE⁃La

Fig.3. XPS spectra of FGPE⁃La

含量/%	C元素	H元素	O元素	La元素
实际含量	39.48	5.99	38.42	16.11
理论含量	40.06	5.28	38.11	16.55

Tab.1. The results of element analysis and rare earth content test of FGPE⁃La

Fig.4. Experiment of heat aging in oven with different heat stabilizers

Fig.5. Electrical conductivity test results of different heat stabilizers

Fig.6. Torque rheological test results of different heat stabilizers

热稳定剂	吸收HCl的量， mg（HCl）/g热稳定剂
FGPE⁃La	93.64
ZnSt2	106.71
CaSt2	88.45

Tab.2. The ability of different heat stabilizers to absorb HCl

Fig.7. Results of oven thermal aging experiments on FGPE⁃La combined with ZnCl2

Fig.8. Antibacterial effect of different proportion of FGPE⁃La added to PVC on Escherichia coli

Fig.9. The change of OD value of E. coli before and after adding FGPE⁃La

Fig.10. Effect of FGPE⁃La on erythrocyte hemolysis

Fig.11. SEM of Escherichia coli before and after adding FGPE La

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