Thermal stability and thermal aging of poly(vinyl chloride)/MgAl layered double hydroxides composites

Zhang, Hongmei; Zhang, Shuhua; Stewart, Polite; Zhu, Chenhui; Liu, Weijun; Hexemer, Alexander; Schaible, Eric; Wang, Cheng

doi:10.1007/s10118-016-1778-4

Cited by 23 publications

(12 citation statements)

References 38 publications

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“…The C–Cl bond in the PVC structure has lower bond energy compared to those of the C–C and C–H bonds. Thus, once the PVC is pyrolyzed, the C–Cl bonds will be given priority to break, which will lead to the release of hydrogen chloride. , A group of absorption peaks in the 3100–2600 cm –1 region are found, which are ascribed to asymmetrical stretching of H–Cl . Moreover, when the temperature is at the highest loss rate of the first stage, the intensity of the absorption peak reaches its maximum.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Dechlorination and Charring Reaction of Polyvinyl Chloride by CuAl Layered Double Hydroxide

et al. 2018

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The catalytic effects of CuAl layered double hydroxide (CuAl-LDH) on dechlorination and carbonization of polyvinyl chloride (PVC) during pyrolysis were investigated. The thermal degradation and combustion behaviors were researched via thermogravimetric analysis (TGA) and cone calorimetry (CONE). The released gases were evaluated in detail by thermogravimetric analysis coupled with Fourier transform infrared spectrometry (TGA-FTIR). Subsequently, elemental analysis and scanning electron microscopy-energy dispersive spectrometry (SEM-EDS) were employed to fully characterize the solid residues. The results of TGA and CONE showed that the addition of CuAl-LDH brought about the PVC degradation earlier and the char residues increase significantly. Moreover, the results of TGA-FTIR, elemental analysis, SEM-EDS, and Raman analysis revealed that the existence of CuAl-LDH accelerated the dehydrochlorination and promoted the char formation of PVC. CuAl-LDH maybe a potential catalyst applied to treat PVC waste into carbon materials to realize material and chemical recycling, which possess tremendous environmental and economic benefits.

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Section: Resultsmentioning

confidence: 99%

Catalytic Dechlorination and Charring Reaction of Polyvinyl Chloride by CuAl Layered Double Hydroxide

et al. 2018

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“…There was a broad absorption peak in the wavenumber range 2600–3100 cm −1 , assigned to HCl group stretching, indicating the removal of HCl gas during PVC composite pyrolysis 36,37 . In addition, the peaks in 1724–1921 cm −1 and 1008–1150 cm −1 belonged to the chlorinated compounds, accompanied by the peak at 671 cm −1 for stretching of the CCl bond 38 . In comparison, the intensity of pyrolysis gas emission of the PVC/CMF‐SnO 2 ‐2.5 was much lower than that of the neat PVC.…”

Section: Resultsmentioning

confidence: 97%

Reutilization of melamine‐formaldehyde foam wastes: Removing Sn²⁺ in simulated tin‐containing wastewater to transform a fire hazard suppressant of flexible poly(vinyl chloride)

Qiu

Wang

et al. 2021

J of Applied Polymer Sci

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Melamine‐formaldehyde (MF) foam has wide applications due to good flame retardancy, excellent sound absorption, and high thermal stability. However, the recycling of MF foam wastes remains a challenge due to its thermosetting nature. Here, we demonstrate a new strategy for discarded foams as solid adsorbents for removing tin ions in simulated tin‐containing wastewater. Results showed that the removal rate of tin in simulated wastewater is as high as 99.996%. Moreover, after simple calcination, as‐obtained products can be used as high‐efficiency flame retardants for flexible poly(vinyl chloride) (PVC), reducing the peak of heat release rate and total smoke production of PVC by 51.8% and 45.8%, respectively, under the condition of 2.5 wt.% addition. In short, this strategy successfully converted MF foam and tin wastewater to valuable flame retardants, opening the way for the environmentally friendly recycling of MF waste and the simultaneous treatment of tin‐containing wastewater.

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“…However, too long crystallization time will lead to the aggravation of product agglomeration, which is not conducive to the dispersion of BD–hydrocalumite in PVC. 25 Therefore, the preferred crystallization time was 19 h for the preparation of BD–hydrocalumite.…”

Section: Resultsmentioning

confidence: 99%

Bean Dreg–Hydrocalumite Composite as a Highly Efficient Thermal Stabilizer for Poly(vinyl chloride)

Luo

Tang

Yuan³

et al. 2022

ACS Omega

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Bean dreg (BD)–hydrocalumite composites were prepared by a hydrothermal method with BD, Ca(OH) 2 , Al(OH) 3 , and Na 2 CO 3 as raw materials. The samples were characterized by powder X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and N 2 physical adsorption–desorption. Their properties as a thermal stabilizer for poly(vinyl chloride) were tested using a torque rheometer and static thermal aging method. Compared with traditional hydrocalumite, the crystal size of the BD–hydrocalumite composite was relatively small, which made it exhibit good dispersion and better thermal stability for poly(vinyl chloride). In addition, the effects of preparation conditions on the properties of BD–hydrocalumite as a heat stabilizer were also investigated. Under the conditions of n [Ca(OH) 2 /Al(OH) 3 /Na 2 CO 3 ] = 4.4:2:1, a BD dosage of 5%, a crystallization temperature of 90 °C, and 19 h, the prepared BD–hydrocalumite showed the best performance, and the dynamic thermal stability time of poly(vinyl chloride) reached 2149 s.

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Thermal stability and thermal aging of poly(vinyl chloride)/MgAl layered double hydroxides composites

Cited by 23 publications

References 38 publications

Catalytic Dechlorination and Charring Reaction of Polyvinyl Chloride by CuAl Layered Double Hydroxide

Catalytic Dechlorination and Charring Reaction of Polyvinyl Chloride by CuAl Layered Double Hydroxide

Reutilization of melamine‐formaldehyde foam wastes: Removing Sn²⁺ in simulated tin‐containing wastewater to transform a fire hazard suppressant of flexible poly(vinyl chloride)

Bean Dreg–Hydrocalumite Composite as a Highly Efficient Thermal Stabilizer for Poly(vinyl chloride)

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Thermal stability and thermal aging of poly(vinyl chloride)/MgAl layered double hydroxides composites

Cited by 23 publications

References 38 publications

Catalytic Dechlorination and Charring Reaction of Polyvinyl Chloride by CuAl Layered Double Hydroxide

Catalytic Dechlorination and Charring Reaction of Polyvinyl Chloride by CuAl Layered Double Hydroxide

Reutilization of melamine‐formaldehyde foam wastes: Removing Sn2+ in simulated tin‐containing wastewater to transform a fire hazard suppressant of flexible poly(vinyl chloride)

Bean Dreg–Hydrocalumite Composite as a Highly Efficient Thermal Stabilizer for Poly(vinyl chloride)

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Reutilization of melamine‐formaldehyde foam wastes: Removing Sn²⁺ in simulated tin‐containing wastewater to transform a fire hazard suppressant of flexible poly(vinyl chloride)