Decrosslinking Effect of Mechanochemistry on Waste Acrylonitrile Butadiene Rubber/Poly (Vinyl Chloride) Blends: A Method for Zero-Waste Recycling

Lai, Shuangxin; Li, Yijun; Ding, Hongmei; Bai, Shibing

doi:10.1089/ees.2020.0217

Cited by 3 publications

(3 citation statements)

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“…It could be seen that WEP had almost no mass loss below 260 °C. The maximum decomposition was in the stage from 260 to 361 °C, with a mass loss of 69%, which was owing to the oxidation of the side chain of the epoxy and the gradual carbonization of the main chain. , Generally, the as-received WEP mainly consisted of epoxy resin, and polymers such as PE, PP, and PA had also been detected …”

Section: Resultsmentioning

confidence: 99%

“…47,48 Generally, the as-received WEP mainly consisted of epoxy resin, and polymers such as PE, PP, and PA had also been detected. 49 Morphological change is one of the most important structural changes of materials in mechanochemistry. The morphology and particle size distribution of the WEP powder with different milling cycles are shown in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

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

Kang

Yang

Bai

et al. 2021

ACS Sustainable Chem. Eng.

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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.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

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.

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“…Because of the unique structure of S3M equipment, the CPF waste can be pulverized into ultrafine powders at room temperature. Compared to conventional milling devices, the S3M equipment has low energy cost and high production capacity (production efficiency exceeding 150 kg/h), showing great commercial application potential in waste recycling and utilization. , Figure b shows the morphology variation and the corresponding size distribution of the CPF during the milling process. One can observe that with the increasing milling cycles, the average particle size of the powders rapidly dropped and the morphology became relatively uniform.…”

Section: Results and Discussionmentioning

confidence: 99%

High-Value Recycling of Isotactic Polypropylene-Based Plastic Waste as a Crystallization Promoter for High-Performance Polypropylene Random Copolymers

Wang

Nie

et al. 2022

ACS Sustainable Chem. Eng.

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Highly efficient recycling of nonrenewable resources is increasingly important at the global concern of resource crisis and environmental issue. Here, a new strategy for value-added application of isotactic polypropylene (iPP)-based plastic waste as a crystallization promoter was proposed, and cigarette packaging film (CPF) waste as a typical single-component iPP was used as a representative example to demonstrate the successful application. First, the CPF wastes were pulverized into ultrafine powders under three-dimensional shearing force generated by solid-state shear milling equipment. Then, the CPF powders as a crystallization promoter were incorporated into a polypropylene random copolymer (PPR) in the presence of a β-nucleator by utilizing high-chain stereoregularity and strong crystallization nature to cultivate rich β-crystals. Finally, the outstanding combination of strength and toughness of the as-prepared PPR sample was exemplified by the increases of 66 and 25.8% in elongation at break and impact strength over a pure PPR sample at the guarantee of mechanical strength. This simple blending approach also can be extended easily to the recycling of the other polypropylene-based waste plastics and thus is an important step toward solving global plastic pollution.

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A Review on Mechanochemistry: Approaching Advanced Energy Materials with Greener Force

Liu

Zeng

et al. 2022

Advanced Materials

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high volatility, and poor security, renewable energy must be converted and stored before it can be stably and efficiently used. [2] Energy conversion refers to the conversion of one form of energy to another form, or several forms. This is achieved through energy conversion devices and corresponding technologies. The core part of energy conversion devices is the active material, which is also the key to providing high conversion efficiency. Chemical synthesis is usually employed for the preparation of various energy conversion active materials, which can be divided into four major categories in terms of reaction principles: thermochemistry, electrochemistry, mechanochemistry, and photochemistry. Among them, mechanochemistry is the study of chemical reactions induced by mechanical energy. [3] Mechanochemical syntheses can be carried out under a variety of conditions, such as at low temperatures, in inert or reactive atmospheres, under high gas pressures, in a solvent or under all-solid-state conditions. Thus, mechanochemical techniques are simple, versatile, and sustainable. Mechanochemistry can be used to develop new methods for some chemical reactions that are difficult to be realized by conventional chemical synthesis.Mechanochemistry was first reported with the development of grinding technology. As early as 315 B.C., Aristotle's students demonstrated for the first time that elemental Hg could be obtained by grinding cinnabar and acetic acid in a mortar. [4] For several decades, the development of mechanochemistry has become more comprehensive and systematic, and mechanochemical methods have been widely used in the fields of inorganic and organic materials, magnetic materials, and metallurgy. Mechanochemical equipment has evolved from the original manual mortar and pestle to a variety of novel mechanized instruments. Mechanochemical techniques including ballmilling, pan-milling, and ultrasonic irradiation have been successfully applied to prepare advanced functional materials for energy conversion and storage. However, most recent surveys/ reviews regarding mechanochemical technologies for material preparation are mainly focused on ball-milling. [3,[5][6][7][8] Recently, the unique advantages of mechanochemistry for energy storage and conversion applications have inspired Mechanochemistry with solvent-free and environmentally friendly characteristics is one of the most promising alternatives to traditional liquid-phase-based reactions, demonstrating epoch-making significance in the realization of different types of chemistry. Mechanochemistry utilizes mechanical energy to promote physical and chemical transformations to design complex molecules and nanostructured materials, encourage dispersion and recombination of multiphase components, and accelerate reaction rates and efficiencies via highly reactive surfaces. In particular, mechanochemistry deserves special attention because it is capable of endowing energy materials with unique characteristics and properties. Herein, the latest advances and progress in me...

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Decrosslinking Effect of Mechanochemistry on Waste Acrylonitrile Butadiene Rubber/Poly (Vinyl Chloride) Blends: A Method for Zero-Waste Recycling

Cited by 3 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

High-Value Recycling of Isotactic Polypropylene-Based Plastic Waste as a Crystallization Promoter for High-Performance Polypropylene Random Copolymers

A Review on Mechanochemistry: Approaching Advanced Energy Materials with Greener Force

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