Determination of solid-phase reaction mechanism and chlorine migration behavior of co-pyrolyzing PVC CaCO3 based polymer using temperature-dependent FTIR and XRD analysis

Zou, Yanyan; Li, Yaoqiang; Bourbigot, Serge; Zhang, Jiaqing; Guo, Yi; Li, Kaiyuan; He, Xuanze; Baolati, Jiayidaer

doi:10.1016/j.polymdegradstab.2021.109741

Cited by 33 publications

(9 citation statements)

References 40 publications

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“…Figure 3A compares the DTG curves of OTIP, TIP, and transformer oil. From Figure 3A, it can be confirmed that the first and second mass loss peaks of OTIP belong to dehydration and pyrolysis of the transformer oil, 25 respectively, while the third peak corresponds to pyrolysis of TIP. Figure 3B,C shows the TG and DTG curves of the surface and core samples of OTIP.…”

Section: Resultsmentioning

confidence: 89%

Effect of immersion time on the combustion characteristics of oil‐impregnated transformer insulating paperboard

et al. 2022

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Transformer insulating paperboard is an insulating material commonly used in the oil-filled equipment in substations, which is usually immersed in the transformer oil.In this study, the effects of immersion time on the combustion characteristics of oil-impregnated transformer insulating paperboard are studied using the thermogravimetric, UL94 vertical flammability, and cone calorimeter experiments. The experimental results show that the total oil content increases with increasing immersion time and reaches the saturation state in 240 h, with a saturation content of 14.7% ± 0.5%. However, the distribution of oil content inside the paperboard is uneven. At the saturation state, the surface oil content is 35.5%, being about 3 times of the core oil content. The results of UL94 vertical flammability experiments show that the flame spread rate increases with increasing immersion time and is controlled by the total oil content. In the cone calorimeter experiments, the time to ignition is significantly reduced compared to the clean paperboard. Unlike the flame spread rate, the ignition time is controlled by the surface oil content and barely varies with immersion time. The critical heat flux of oil-impregnated transformer insulating paperboard is found as 3.9 kW/m 2 , being only 1/3 of clean paperboard. With increasing immersion time, the peak heat release rate increases, while the total heat release, fire growth index, and effective heat of combustion present linear correlations with the total oil content. The CO yield increases with increasing immersion time, and the released CO mainly comes from the combustion of transformer oil.

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Section: Resultsmentioning

confidence: 89%

Effect of immersion time on the combustion characteristics of oil‐impregnated transformer insulating paperboard

et al. 2022

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“…Unlike LCSP, HCSP does not contain N elements. This was attributed to the hightemperature of the shell powder calcined process, which leads to a more thorough decomposition of organic matter [22]. The content of C and O elements in HCSP was significantly reduced due to the high-temperature calcined process that converts most of the calcium carbonate into calcium oxide.…”

Section: Ft-ir and Xps Analysis Of Lcsp And Hcspmentioning

confidence: 99%

Calcined and Hydrated Shell Powder with Layered Porous Structures for Food Sterilization and Pesticide Residue Removal

Liu,

Tang,

Liao

et al. 2023

J. Phys.: Conf. Ser.

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Shell powder, a natural source product with excellent adsorption and antibacterial properties, has exhibited a broad application prospect in daily life. Herein, low-temperature calcined shell powder (LCSP) and high-temperature calcined and hydrated shell powder (HCSP) were prepared using shells as raw materials in different calcination processes. The surface structures and the chemical compositions were analyzed and the specific surface areas and pore size distributions were measured. The LCSP and HCSP reserved the unique layered porous structures of the shell. The main composition of LCSP is CaCO3, which also contains a small number of organisms. The main composition of HCSP is Ca (OH)2, which also contains CaO and a small amount of CaCO3. According to the better adsorption characteristic of the HCSP, the antibacterial activities and the removal abilities of pesticide residues of HCSP were systematically studied. The results indicated that HCSP exhibited excellent antibacterial activity (> 99.99%) and high efficiency in removing common pesticide residues (> 90%).

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“…As illustrated in Figures 5(a) and 5(b), the sheath (CR) and insulation (EPR) of the non-class 1E cable are polymer materials composed of C, H, O, and Cl. These components are volatile elements and exhibit the property of volatilizing in molecular forms such as HCl, CO 2 , and H 2 O in the process of generating cracks in the organic polymer during thermal decomposition [16]. Consequently, the thermal deterioration of the non-class 1E cable triggers instability in the structure of the polymer material by inducing the thermal decomposition of the sheath and insulation, which are polymer materials.…”

Section: Initial Combustion Charactersticsmentioning

confidence: 99%

Combustion Characterization according to Accelerated Deterioration Temperature of a Non-class 1E Cable

et al. 2022

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In this study, the temperature effect of accelerated deterioration on combustion characteristics was investigated when accelerating aging a non-class 1E cable for nuclear power plants. The accelerated aging of 40 years was conducted under five temperature conditions of 90 °C, 100 °C, 110 °C, 130 °C and 150 °C. In the early period of combustion when the first peak of the heat release rate emerged, the heat release of the non-aged cable exhibited the largest peak value of 225 kW/m2 while the heat release of the aged cables exhibited a comparatively low first peak value. The first peaks of aged cables decreased as the temperature condition increased. This tendency is considered to emerge from the thermal decomposition and destabilization of long-chained polymer structure when the sheath and insulation of cables are exposed to a thermal degradation environment. Hence, this loosening of the chemical bond and its decomposition severely affected the degradation of the flame retardant performance. In particular, in the combustion characteristics for the aged cables under temperature conditions of 100 °C or higher, the first peak value of the heat release rate did not exceed 200 kW/m2. In the middle period of combustion, the heat release rates of both the non-aged and the aged cables were kept constant at approximately 25-30 kW/m2 without significant change. In the later period of combustion, the second heat release peaks emerged for only non-aged, 90 °C and 100 °C cables because the cables aged under low temperature conditions (90 °C and 100 °C) maintained a certain level of flame retardant performance while those aged above 100 °C did not. Therefore, it can be considered that the higher accelerated deterioration temperature triggers the higher degradation of the flame retardant performance, and 100 °C is a critical temperature that involves the significant degradation effect.

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Determination of solid-phase reaction mechanism and chlorine migration behavior of co-pyrolyzing PVC CaCO3 based polymer using temperature-dependent FTIR and XRD analysis

Cited by 33 publications

References 40 publications

Effect of immersion time on the combustion characteristics of oil‐impregnated transformer insulating paperboard

Effect of immersion time on the combustion characteristics of oil‐impregnated transformer insulating paperboard

Calcined and Hydrated Shell Powder with Layered Porous Structures for Food Sterilization and Pesticide Residue Removal

Combustion Characterization according to Accelerated Deterioration Temperature of a Non-class 1E Cable

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