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The effect of Zn-Al-hydrotalcites composited with calcium stearate and β-diketone on the thermal stability of PVC.

Tong M, Chen H, Yang Z, Wen R - Int J Mol Sci (2011)

Bottom Line: The results showed that the Zn-Al-hydrotalcites can be successfully synthesized at three different Zn/Al ratios of 3:1, 2:1 and 1:1.The results showed that Zn-Al-LDHs can not only enhance the stability of PVC significantly due to the improved capacity of HCl-adsorption but also increase the initial stability and ensure good-initial coloring due to the presence of the Zn element.The effects of various amounts of Zn-Al-LDHs, CaSt(2) and β-diketone on the thermal stability of PVC were discussed.

View Article: PubMed Central - PubMed

Affiliation: Hunan Chemical Vocational and Technical College, Zhuzhou 412004, China; E-Mail: 13973327103@163.com.

ABSTRACT
A clean-route synthesis of Zn-Al-hydrotalcites (Zn-Al-LDHs) using zinc oxide and sodium aluminate solution has been developed. The as-obtained materials were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The effects of metal ions at different molar ratios on the performance of hydrotalcites were discussed. The results showed that the Zn-Al-hydrotalcites can be successfully synthesized at three different Zn/Al ratios of 3:1, 2:1 and 1:1. Thermal aging tests of polyvinyl chloride (PVC) mixed with Zn-Al-LDHs, calcium stearate (CaSt(2)) and β-diketone were carried out in a thermal aging test box by observing the color change. The results showed that Zn-Al-LDHs can not only enhance the stability of PVC significantly due to the improved capacity of HCl-adsorption but also increase the initial stability and ensure good-initial coloring due to the presence of the Zn element. The effects of various amounts of Zn-Al-LDHs, CaSt(2) and β-diketone on the thermal stability of PVC were discussed. The optimum composition was determined to be 0.1 g Zn-Al-LDHs, 0.15 g CaSt(2) and 0.25 g β-diketone in 5 g PVC.

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The color stability of PVC with 0.1 g LDHs, 0.15 g CaSt2 and 0.25 g β-diketone.
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f6-ijms-12-01756: The color stability of PVC with 0.1 g LDHs, 0.15 g CaSt2 and 0.25 g β-diketone.

Mentions: The active ZnSt2 is generated and the undesirable ZnCl2 is consumed. The product ZnSt2 can scavenge HCl and react with the labile chlorine (allylic chlorine) atoms on the PVC chain. From Table 3, the optimum amount of CaSt2 is thought to be 0.15 g. The photos for the color changes of PVC with 0.15 g CaSt2 are presented in Figure 6.


The effect of Zn-Al-hydrotalcites composited with calcium stearate and β-diketone on the thermal stability of PVC.

Tong M, Chen H, Yang Z, Wen R - Int J Mol Sci (2011)

The color stability of PVC with 0.1 g LDHs, 0.15 g CaSt2 and 0.25 g β-diketone.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC3111632&req=5

f6-ijms-12-01756: The color stability of PVC with 0.1 g LDHs, 0.15 g CaSt2 and 0.25 g β-diketone.
Mentions: The active ZnSt2 is generated and the undesirable ZnCl2 is consumed. The product ZnSt2 can scavenge HCl and react with the labile chlorine (allylic chlorine) atoms on the PVC chain. From Table 3, the optimum amount of CaSt2 is thought to be 0.15 g. The photos for the color changes of PVC with 0.15 g CaSt2 are presented in Figure 6.

Bottom Line: The results showed that the Zn-Al-hydrotalcites can be successfully synthesized at three different Zn/Al ratios of 3:1, 2:1 and 1:1.The results showed that Zn-Al-LDHs can not only enhance the stability of PVC significantly due to the improved capacity of HCl-adsorption but also increase the initial stability and ensure good-initial coloring due to the presence of the Zn element.The effects of various amounts of Zn-Al-LDHs, CaSt(2) and β-diketone on the thermal stability of PVC were discussed.

View Article: PubMed Central - PubMed

Affiliation: Hunan Chemical Vocational and Technical College, Zhuzhou 412004, China; E-Mail: 13973327103@163.com.

ABSTRACT
A clean-route synthesis of Zn-Al-hydrotalcites (Zn-Al-LDHs) using zinc oxide and sodium aluminate solution has been developed. The as-obtained materials were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The effects of metal ions at different molar ratios on the performance of hydrotalcites were discussed. The results showed that the Zn-Al-hydrotalcites can be successfully synthesized at three different Zn/Al ratios of 3:1, 2:1 and 1:1. Thermal aging tests of polyvinyl chloride (PVC) mixed with Zn-Al-LDHs, calcium stearate (CaSt(2)) and β-diketone were carried out in a thermal aging test box by observing the color change. The results showed that Zn-Al-LDHs can not only enhance the stability of PVC significantly due to the improved capacity of HCl-adsorption but also increase the initial stability and ensure good-initial coloring due to the presence of the Zn element. The effects of various amounts of Zn-Al-LDHs, CaSt(2) and β-diketone on the thermal stability of PVC were discussed. The optimum composition was determined to be 0.1 g Zn-Al-LDHs, 0.15 g CaSt(2) and 0.25 g β-diketone in 5 g PVC.

Show MeSH