Decrosslinking reaction kinetics of silane-crosslinked polyethylene in sub- and supercritical fluids

Baek, Bum Ki; La, Yun Ho; Lee, Albert S.; Han, Haksoo; Kim, Seong Hun; Hong, Soon Man; Koo, Chong Min

doi:10.1016/j.polymdegradstab.2016.05.025

Cited by 15 publications

(8 citation statements)

References 26 publications

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“…Baek and co-workers studied the kinetics of the selective de-crosslinking of silane-XLPE in sc alcohols in a batch process [ 69 ] and in a continuous process [ 68 , 70 , 71 ]. For example, in their Ref.…”

Section: Recycling Of Polysiloxanes In Supercritical Mediamentioning

confidence: 99%

“…Finally, in Ref. [ 71 ], a comparison of the kinetics of the de-crosslinking of silane-XLPE in various sc alcohols and in SCW is given. It is shown that at 380 °C the reaction rate constants for sc methanol, ethanol, 2-propanol, and water are, respectively, 2.8 min −1 , 2.6 min −1 , 2.4 min −1 and 2.1 min −1 .…”

Section: Recycling Of Polysiloxanes In Supercritical Mediamentioning

confidence: 99%

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Chemical Recycling of High-Molecular-Weight Organosilicon Compounds in Supercritical Fluids

et al. 2022

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The main known patterns of thermal and/or catalytic destruction of high-molecular-weight organosilicon compounds are considered from the viewpoint of the prospects for processing their wastes. The advantages of using supercritical fluids in plastic recycling are outlined. They are related to a high diffusion rate, efficient extraction of degradation products, the dependence of solvent properties on pressure and temperature, etc. A promising area for further research is described concerning the application of supercritical fluids for processing the wastes of organosilicon macromolecular compounds.

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Section: Recycling Of Polysiloxanes In Supercritical Mediamentioning

confidence: 99%

Section: Recycling Of Polysiloxanes In Supercritical Mediamentioning

confidence: 99%

Chemical Recycling of High-Molecular-Weight Organosilicon Compounds in Supercritical Fluids

et al. 2022

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“…It is more and more used in plumbing (Kelley et al, 2014) as it is cheaper, does not feature corrosion issues in comparison to its metallic equivalents and can display a whole better environmental performance than more classic options (Asadi et al, 2016). However, PEX is a concern in mechanical recycling since it has poorer processability as a thermoset (Baek et al, 2016;Shamsaei et al, 2017) and represents an infusible fraction when mixed to regular PE. Sadly, they have very similar spectra, even identical in MWIR (Fig.…”

Section: Pex: Crosslinked Pementioning

confidence: 99%

MIR spectral characterization of plastic to enable discrimination in an industrial recycling context: II. Specific case of polyolefins

et al. 2019

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Sorting at industrial scale is required to perform mechanical recycling of plastics in order to obtain properties that could be competitive with virgin polymers. As a matter of fact, the most part of the various types of plastic waste are not miscible and even compatible. Mid-Infrared (MIR) HyperSpectral Imagery (HSI) is viewed as one of the solutions to the problem of black plastic sorting. Many Waste of Electrical and Electronic Equipment (WEEE) plastics are black. Nowadays, these materials are difficult to sort at an industrial scale because the main used pigment to produce this color, carbon black, masks the Near-Infrared (NIR) spectra of polymers, the currently most used technology for acute sorting in industrial conditions. In this study, laboratory Fourier-Transform Infrared (FTIR) in Attenuated Total Reflection mode (ATR) has been used as a theoretical toolbox based on physical chemistry to help building an automated HSI discrimination despite its limited conditions, especially shorter wavelengths ranges. Weaker resolution and very short acquisition times are other HSI limitations. Helping fast and exhaustive laboratory characterizations of polymeric waste stocks is the other goal of this study. This study focusses on polyolefins as they represent the second biggest fraction of WEEE plastics (WEEP) after styrenics and since little quantities mixed to styrenics during mechanical recycling can lead to important decrease in mechanical properties. Twelve references were thus evaluated and compared between each other and with real waste samples to highlight spectral elements, which can enable differentiation. Charts compiling the signals of discussed polymers were built aiming to the same objective.

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“…Crosslinking substantially improves compression strength, compression set, tensile strength, thermal stability, and water absorption resistance [3]. However, due to covalent bonds forming the network, XLPE behaves as a thermoset that would degrade before melting, posing challenges in mechanical and physical recyclability [4][5][6]. Second, there are currently a few methods of decrosslinking, but their involvement of supercritical fluids or cryogenic gases far exceeds the cost of landfill or incineration [7].…”

Section: Introductionmentioning

confidence: 99%

Crosslinked Polyethylene (XLPE) Recycling via Foams

Bawareth

Ravichandran

et al. 2022

Polymers

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Efficient recycling of crosslinked polyethylene has been challenging due to manufacturing difficulties caused by chemical crosslinking. This study focuses on simple processing via solid waste powder generation and particle fining for the subsequent crosslinked polyethylene inclusion and dispersion in rigid polyurethane foam. In addition, the concentration effects of crosslinked polyethylene in polyurethane were studied, showing a well-controlled foam microstructure with uniform pores, retained strength, better thermal degradation resistance, and, more importantly, increased thermal capabilities. Thus, the simple mechanical processing of crosslinked polyethylene and chemical urethane foaming showed the massive potential of recycling large amounts of crosslinked polyethylene in foams for broad applications in food packaging, house insulation, and sound reduction.

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Decrosslinking reaction kinetics of silane-crosslinked polyethylene in sub- and supercritical fluids

Cited by 15 publications

References 26 publications

Chemical Recycling of High-Molecular-Weight Organosilicon Compounds in Supercritical Fluids

Chemical Recycling of High-Molecular-Weight Organosilicon Compounds in Supercritical Fluids

MIR spectral characterization of plastic to enable discrimination in an industrial recycling context: II. Specific case of polyolefins

Crosslinked Polyethylene (XLPE) Recycling via Foams

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