Selective Decomposition Process and Mechanism of Si–O–Si Cross-Linking Bonds in Silane Cross-Linked Polyethylene by Solid-State Shear Milling

Sun, Fasen; Yang, Shuangqiao; Wang, Qi

doi:10.1021/acs.iecr.0c01956

Cited by 19 publications

(23 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mass ( W i ) of samples with different cycles was precisely weighed, and the weighed samples were extracted in acetone for 30 h. After extraction, the residue was taken out and placed in a fume hood to volatilize naturally for 24 h and then dried in a vacuum oven at 80 °C for 24 h. Finally, the mass ( W ) of the remaining material was accurately weighed. Hence, the gel fraction of the WEP could be obtained by gel fraction = W / W i × 100% . The nuclear magnetic resonance (NMR) of the material was tested by an Avance II-400 MHz NMR spectrometer (Bruker, CHE) at a temperature of 25 °C using CDCl 3 as the solvent.…”

Section: Methodsmentioning

confidence: 99%

Novel Application of Mechanochemistry in Waste Epoxy Recycling via Solid-State Shear Milling

Kang

Yang

Bai

et al. 2021

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

Epoxy resin is one of the most popular thermosetting resins and has been widely used in many fields for its excellent performance. However, the stable crosslinking structure of waste epoxy (WEP) caused poor interfacial compatibility, which makes it very difficult to be recycled. This paper reported a novel method for recycling the waste epoxy through partial de-crosslinking and recrosslinking processes via solid-state shear milling (S3M). The waste epoxy was effectively pulverized into an ultrafine powder about 17 μm and the crosslinking density decreased from 3.43 × 10 −3 to 2.69 × 10 −3 mol/mL. The C−N, C−C, and C−O−C bonds in the WEP were broken by the mechanochemical action and many hydroxyl and amino groups were formed on the surface of the WEP powder, which could react with the epoxy and curing agent to form the new crosslinking network. The interface strength between the WEP powder and epoxy (EP) resin matrix was improved greatly and there were no voids that could be observed by scanning electron microscopy (SEM) after the re-crosslinking process. The maximum tensile strength, flexural strength, and non-notched impact strength of WEP/EP composites reached up to 42.2 MPa, 73.2 MPa, and 8.8 kJ/ m 2 , which means 62, 41, and 109% enhancement, respectively. This low-cost, high-efficiency, and environmentally friendly method shows great potential for value-added recycling of thermosetting resins.

show abstract

Section: Methodsmentioning

confidence: 99%

Novel Application of Mechanochemistry in Waste Epoxy Recycling via Solid-State Shear Milling

Kang

Yang

Bai

et al. 2021

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

show abstract

“… 15 − 17 In order to recycle XLPE in a simple and efficient way, solid-state shear milling (S 3 M) technology was used. 18 − 20 S 3 M equipment is based on a traditional Chinese stone pan mill, which is a mechanochemical reactor. With the unique three-dimensional shear structure, the materials in the equipment are subjected to shearing, squeezing, and stretching stress fields.…”

Section: Introductionmentioning

confidence: 99%

“… 21 The motion trajectory of materials is a spiral line, increasing the milling path, which can realize the functions of crushing, dispersing, mixing, etc. 21 It can be applied to destroy the cross-linked bond of silane cross-linked polyethylene (Si-XLPE) and achieve the fracture between some −C–Si– and −O–Si–O– bonds, 20 resulting in the thermoplastic processing of Si-XLPE. However, different from the heterogeneous cross-link network of Si-XLPE, the cross-linked bond of P-XLPE is the same as the C–C chemical bond of the main chain, so it belongs to a homogeneous network structure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Using Asphalt as an Additive for Waste Cross-Linked Polyethylene Recycled Materials to Improve Thermoplastic Processing

et al. 2022

Self Cite

View full text Add to dashboard Cite

With good insulation, cross-linked polyethylene (XLPE) cables are widely used as an important basic material for power transportation. Due to being insoluble and infused, the cross-linked network structure caused a challenge in the recycling of waste XLPE, which is usually treated by incineration and landfilling. In this research, XLPE was part-de-cross-linked via solid-state shear milling (S 3 M) technology, but the resulting powder was difficult to process. In order to improve the re-processability of XLPE, asphalt with a similar structure was added during the thermoplastic processing. To deeply understand the influence of asphalt on the matrix, the compatibility, dispersion, and rheological properties of the composites were characterized. Due to the good compatibility between de-cross-linked XLPE and asphalt, the viscosity of the composites decreased significantly. Some sea-island structures also formed in composites, which increased the toughness of the composites, so the elongation at break reached as high as 322%. The use of asphalt to achieve the processing performance of part-de-cross-linked XLPE powder was highly effective. Furthermore, the prepared composites showed potential application in the field of waterproofing, which could recycle waste XLPE cables on a large scale.

show abstract

“…The motion trajectory of material is a spiral line, which has a long path enables the equipment to realize the functions of crushing, dispersing, mixing, etc [17]. This technology has been reported to destroy the crosslinked bond of silane cross-linked polyethylene (Si-XLPE) and achieved the fracture between some -C-Siand -O-Si-O-bonds [21], resulting in thermoplastic processable polyethylene. To further realize the valueadded application of XLPE powder, it is important to improve the processing performance of composites.…”

Section: Introductionmentioning

confidence: 99%

The Novel Application of Asphalt in Cross-Linked Polyethylene Composite

Liao

Lai

Yang

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

The cross-linked polyethylene (XLPE) cables are widely used as an important basic material for power transportation. However, the cross-linked network structure caused challenge in the recycling of waste XLPE, which usually be treated by incineration and landfilling. In this research, XLPE was de-crosslinked via solid-state shear milling (S3M) and the asphalt was used as plasticizer during the thermoplastic processing. To deeply understand the influence of asphalt on the matrix, the compatibility, dispersion, and rheological properties of composites were characterized. Due to the good compatibility between de-crosslinked XLPE and asphalt, the viscosity of the composites decreased significantly. Some sea-island structure also formed in composites, which increased the toughness of the composites and the elongation at break reach as high as 322%. The use of asphalt to achieve the processing performance of de-crosslinked XLPE powder was highly effective and composites can be processed by ordinary polymer processing equipment. Furthermore, the prepared composites show potential application in the field of waterproofing which could recycle of waste XLPE cables in large-scale.

show abstract

Selective Decomposition Process and Mechanism of Si–O–Si Cross-Linking Bonds in Silane Cross-Linked Polyethylene by Solid-State Shear Milling

Cited by 19 publications

References 50 publications

Novel Application of Mechanochemistry in Waste Epoxy Recycling via Solid-State Shear Milling

Novel Application of Mechanochemistry in Waste Epoxy Recycling via Solid-State Shear Milling

Using Asphalt as an Additive for Waste Cross-Linked Polyethylene Recycled Materials to Improve Thermoplastic Processing

The Novel Application of Asphalt in Cross-Linked Polyethylene Composite

Contact Info

Product

Resources

About