Preparation, shape memory performance and microstructures of emulsified asphalt modified by multi-walled carbon nanotubes

Sheng, Xiaohui; Xu, Tao; Wang, Mo

doi:10.1016/j.conbuildmat.2019.116954

Cited by 38 publications

(5 citation statements)

References 38 publications

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“…Due to these advantages, preparing epoxy‐based composites using carbon nanotubesis viewed as an important method for improving the overall performance of the materials. Sheng et al 22 have prepared emulsified asphalt from styrene‐butadiene‐styrene/multi‐walled carbon nanotubes (SBS/MWCNTs), and the results indicated 0.03 wt% of MWCNTs content achieved the best effect of reinforcing network structures. Patel et al 23 performed various mechanical tests to investigate composites based from polyurethane/MWCNTs, and discussed shape‐memory performance under microwave.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of modified multi‐walled carbon nanotubes as a reinforcement for epoxy shape‐memory polymer composites

Wang

Tang

et al. 2020

Polymers for Advanced Techs

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Effectively improving the mechanical properties and thermal resistance of epoxy shape-memory polymers (ESMPs) without affecting their shape-memory performance is necessary to expand these polymers in practical applications. In this article, modified multi-walled carbon nanotubes (MWCNTs) were prepared and used as efficient reinforcement for enhancing the comprehensive properties of ESMPs. Increases of nearly 289% to 444% for impact strength and 112% to 184% for tensile force were obtained by adding only 0.1 to 1 wt% epoxy-modified MWCNTs. The addition of unmodified and carboxyl-modified MWCNTs was also investigated but showed less impact on the mechanical properties of the ESMPs than epoxy-modified MWCNTs. Thermogravimetry analysis (TGA) and dynamic mechanical analyses (DMA) showed that less than 1 wt% modified MWCNTs can enhance the heat resistance of ESMPs greatly. Although the shape recovery time for composite materials increased upon adding the MWCNTs, the entire recovery time was still less than 1 minute, and the shape recovery rate was relatively high, nearly 100%.

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Section: Introductionmentioning

confidence: 99%

“…20,21 Due to these advantages, preparing epoxy-based composites using carbon nanotubesis viewed as an important method for improving the overall performance of the materials. Sheng et al 22…”

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confidence: 99%

Preparation of modified multi‐walled carbon nanotubes as a reinforcement for epoxy shape‐memory polymer composites

Wang

Tang

et al. 2020

Polymers for Advanced Techs

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“…X-ray diffraction patterns of raw CNTs and modified CNTs samples were exhibited in Figure 1 d, where the peaks at 25.9° and 42.0° could be ascribed to the (002) and (100) planes of graphite structure (JCPDS card No. 02-0212), respectively [ 40 ]. There were no extra peaks detected in the patterns, indicating the CNTs after treatment well remained the pristine crystal structure.…”

Section: Resultsmentioning

confidence: 99%

Improvement of Carbonyl Groups and Surface Defects in Carbon Nanotubes to Activate Peroxydisulfate for Tetracycline Degradation

et al. 2023

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Carbon nanotubes (CNTs) were considered a promising activator for persulfates due to their high electrical conductivity, large specific surface area and low toxicity. The functional groups and surface defects of CNTs could significantly affect their activation performance. In this study, CNTs with high C=O ratio and defect density (CNT-O-H) were prepared through a facile treatment of raw CNTs with HNO3 oxidation followed by calcination at 800 °C under an argon atmosphere. X-ray photoelectron spectroscopy (XPS) and Raman results showed that the C=O proportion and defect degree (ID/IG) rose to 75% and 1.53, respectively. The obtained CNT-O-H possessed a superior performance towards peroxydisulfate (PDS) activation, and the degradation efficiency of tetracycline (TC) in the CNT-O-H/PDS system was increased to 75.2% from 56.2% of the raw CNTs/PDS system within 40 min. Moreover, the activity of CNT-O-H after use could be easily recovered with re-calcination. In addition, the CNT-O-H/PDS system exhibited high adaptabilities towards wide solution pH (2–10), common coexisting substances and diverse organic pollutants. Singlet oxygen (1O2) was confirmed to be the dominant reactive oxygen species (ROS) generated in the CNT-O-H/PDS system. It was inferred that surface C=O groups and defects of CNTs were the key site to activate PDS for TC degradation.

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“…As illustrated, the addition of Gr or CNTs resulted in a harder consistency of binder. This attributed to the dispersion of modifiers with greater density in asphalt binder [ 51 ].…”

Section: Resultsmentioning

confidence: 99%

Carbon Nanomaterials for Enhancing the Thermal, Physical and Rheological Properties of Asphalt Binders

Liang

et al. 2021

Materials

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Effective thermal conduction modification in asphalt binders is beneficial to reducing pavement surface temperature and relieving the urban heat island (UHI) effect in the utilization of solar harvesting and snow melting pavements. This study investigated the performance of two nanometer-sized modifiers, graphene (Gr) and carbon nanotubes (CNTs), on enhancing the thermal, physical and rheological properties of asphalt binders. Measurements depending on a transient plant source method proved that both Gr and CNTs linearly increased the thermal conductivity and thermal diffusivity of asphalt binders, and while 5% Gr by volume of matrix asphalt contributed to 300% increments, 5% CNTs increased the two parameters of asphalt binders by nearly 72% at 20 °C. Meanwhile, a series of empirical and rheological properties experiments were conducted. The results demonstrated the temperature susceptibility reduction and high-temperature properties promotion of asphalt binders by adding Gr or CNTs. The variation trends in the anti-cracking properties of asphalt binders modified by Gr and CNTs with the modifier content differed at low temperatures, which may be due to the unique nature of Gr. In conclusion, Gr, whose optimal content is 3% by volume of matrix asphalt, provides superior application potential for solar harvesting and snow melting pavements in comparison to CNTs due to its comprehensive contributions to thermal properties, construction feasibility, high-temperature performance and low-temperature performance of asphalt binders.

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Preparation, shape memory performance and microstructures of emulsified asphalt modified by multi-walled carbon nanotubes

Cited by 38 publications

References 38 publications

Preparation of modified multi‐walled carbon nanotubes as a reinforcement for epoxy shape‐memory polymer composites

Preparation of modified multi‐walled carbon nanotubes as a reinforcement for epoxy shape‐memory polymer composites

Improvement of Carbonyl Groups and Surface Defects in Carbon Nanotubes to Activate Peroxydisulfate for Tetracycline Degradation

Carbon Nanomaterials for Enhancing the Thermal, Physical and Rheological Properties of Asphalt Binders

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