Separation mechanism of asphalt rubber and improvement with microwave irradiation

Yao, Zechen; Yang, Renfeng; Shi, Jierong; Chun-hai, Zhang; Zhang, Yong

doi:10.1016/j.conbuildmat.2022.127862

Cited by 12 publications

(7 citation statements)

References 48 publications

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“…Given the microwave irradiation field that created an alternating electric field, plentiful heat energy would be generated at specific locations in the vicinity of both the graphene nanosheets and the polar groups. 35 It is apparent that the characteristic bands at 754 and 699 cm −1 were gradually suppressed with extending the MAD duration, indicating the sufficient rupture of C−S bonds within 8 min. 36 This was accompanied by accumulative cleavage of other polar groups like C−O−C (band 1082 cm −1 ) and C−O/C−C (band 968 cm −1 ), as demonstrated by the progressive reduction in the diffraction intensities at the bands 1082 and 968 cm −1 , respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 92%

“…Figure offers spectroscopic identification for the evolution of macromolecular characteristics during the MAD process, including scissions of rubber main backbone chains and breakdown of cross-linking bonds (e.g., C–S and S–S bonds). Given the microwave irradiation field that created an alternating electric field, plentiful heat energy would be generated at specific locations in the vicinity of both the graphene nanosheets and the polar groups . It is apparent that the characteristic bands at 754 and 699 cm –1 were gradually suppressed with extending the MAD duration, indicating the sufficient rupture of C–S bonds within 8 min .…”

Section: Resultsmentioning

confidence: 99%

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Unexpected Toughening of Poly(lactic acid) by Microwave-Assisted Devulcanization of Waste Latex Rubber

Jiang

et al. 2022

ACS Appl. Polym. Mater.

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Vulcanized, foamed latex rubber features high density of intercommunicated cells and controlled elastomeric properties, rendering wide applications from elastic sponges to rubbery coatings. This provides an emergent incentive for properly recycling, devulcanizing and reusing the waste latex rubber (WLR). Here, a microwave-assisted devulcanization (MAD) approach was disclosed to cleave the cross-links without severe rupture of backbone rubber chains, strategically involving the use of a microwave-assisted hydrothermal reaction at 180 °C for several minutes and incorporation of graphene nanosheets serving as the nanoabsorbers of microwave irradiation. The MAD processing duration was examined to be a vital parameter controlling the macromolecular characteristics: a high devulcanization degree of 83.6% was obtained with 8 min MAD, whereas the soluble content was undesirably increased to 76.2% after 16 min. The devulcanization efficacy was examined by melt compounding with poly(lactic acid) (PLA), displaying extensive interfacial interactions and thereby, creating strong and resilient interfacial adhesion within the PLA composites. With the addition of 10 wt % devulcanized WLR by 8 min MAD, the tensile strength and elongation at break of PLA composites were largely promoted to 58.2 MPa and 16.6%, increasing nearly 62% and 240% compared to those of pure PLA, respectively. The proposed MAD approach may open an environment-respecting and reliable pathway to sustainable recycling of waste rubber, yielding useful components to toughen PLA without sacrificing the strength.

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Section: ■ Results and Discussionmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Unexpected Toughening of Poly(lactic acid) by Microwave-Assisted Devulcanization of Waste Latex Rubber

Jiang

et al. 2022

ACS Appl. Polym. Mater.

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“…However, the monosulfidic bonds with higher energy were not affected and remained intact (Figure 12). The study [45] also found that the intensity of the C-N functional group increased after microwave irradiation, which can prompt interactions and alleviate separation. Reprinted from [29] with the permission of Elsevier, copyright 2021.…”

Section: Microwave Radiationmentioning

confidence: 84%

“…These forms of radiation are capable of penetrating various materials of petroleum origin to varying depths or interacting only with their surfaces, which can be effectively utilized for modifying these materials, offering precision and versatility in grafting [28,41,42]. Additionally, microwave radiation, known for its efficient and controlled heating properties, serves as another valuable tool in the arsenal of radiationinduced grafting methods [43][44][45]. Currently, microwave-induced devulcanization and pyrolysis are viewed as promising methods, particularly for the modification of waste tire rubber recyclate for bitumen additives [46].…”

Section: Radiation-induced Grafting (Rig)mentioning

confidence: 99%

Radiation and Radical Grafting Compatibilization of Polymers for Improved Bituminous Binders—A Review

Baranowska,

Rzepna,

Ostrowski

et al. 2024

Materials

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This review scrutinizes current research on new methods for enhancing bituminous binder performance through radiation and radical grafting of polymer modifiers of bitumen. It investigates innovative methods, including using waste polymers as modifiers and applying radiation for polymer grafting, to overcome challenges like high costs, low aging resistance, and storage stability issues, of which separation of phases polymer/bitumen is the most significant obstacle. These advanced modification techniques promise sustainability through the decrease of the carbon footprint of transportation systems by improving the properties and durability of binders. Additionally, this review discusses the parameters and mechanistic aspects from a scientific perspective, shedding light on the underlying processes that contribute to the improved performance of modified bituminous binders.

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“…These forms of radiation are capable of penetrating various materials of petroleum origin to varying depths or interacting only with their surfaces, which can be effectively utilized for modifying these materials, offering precision and versatility in grafting [25,34,35]. Additionally, microwave radiation, known for its efficient and controlled heating properties, serves as another valuable tool in the arsenal of radiation-induced grafting methods [36][37][38]. Currently, microwave-induced devulcanization and pyrolysis are viewed as promising methods, particularly for the modification of waste tire rubber recyclate for bitumen additives [39].…”

Section: Radiation-induced Grafting (Rig)mentioning

confidence: 99%

Radiation and Radical Grafting Compatibilization of Polymers for Improved Bituminous Binder Performance

Baranowska,

Rzepna,

Ostrowski

et al. 2024

Preprint

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The review scrutinizes the currently performed research on the new methods for enhancing bituminous binder performance through radiation and radical grafting of polymer modifers of bitumen. It investigates innovative methods, including using waste polymers as modifiers, and applying radiation for polymer grafting, to overcome challenges like high costs, low aging resistance and storage stability issues, of which separation of phases polymer/bitumen is the most significant obstacle. These advanced modification techniques promise sustainability through the decrease of the carbon footprint of transportation systems by improving the properties and durability of binders. Additionally, the review discusses the parameters and mechanistic aspects from a scientific perspective, shedding light on the underlying processes that contribute to the improved performance of modified bituminous binders.

show abstract

Separation mechanism of asphalt rubber and improvement with microwave irradiation

Cited by 12 publications

References 48 publications

Unexpected Toughening of Poly(lactic acid) by Microwave-Assisted Devulcanization of Waste Latex Rubber

Unexpected Toughening of Poly(lactic acid) by Microwave-Assisted Devulcanization of Waste Latex Rubber

Radiation and Radical Grafting Compatibilization of Polymers for Improved Bituminous Binders—A Review

Radiation and Radical Grafting Compatibilization of Polymers for Improved Bituminous Binder Performance

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