Fabrication and characterization of self-healing microcapsules containing bituminous rejuvenator by a nano-inorganic/organic hybrid method

Wang, Ying-Yuan; Su, Jun-Feng; Schlangen, Erik; Han, Ningxu; Han, Shan; Li, Wei

doi:10.1016/j.conbuildmat.2016.06.021

Cited by 36 publications

(23 citation statements)

References 23 publications

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“…Figure 3 a–f shows the SEM morphologies of microcapsules with 0%, 2%, 4%, 6%, 8% and 10% contents graphene in shell, respectively. In Figure 3 a, the morphology of microcapsules without graphene is consistent with the previous results [ 16 , 17 , 43 ]. Microcapsules have a global shape without rapture.…”

Section: Resultssupporting

confidence: 90%

“…Then single monomer or prepolymer was absorbed on the droplet surfaces by electrostatic interactions [ 37 ]. Interestingly, inorganic nano-particles were also adhered on the droplets surface by promoting effects of chain entanglement electrostatic attraction [ 16 , 43 ]. At an equilibrium point, MMF-prepolymer molecules were cross-linked to form the nano-inorganic/organic shells under a high temperature and a proper pH value [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

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Fabrication and Characterization of Novel Electrothermal Self-Healing Microcapsules with Graphene/Polymer Hybrid Shells for Bitumenious Material

Wang

Guo

et al. 2018

Nanomaterials

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Self-healing bituminous material has been a hot research topic in self-healing materials, and this smart self-healing approach is a promising a revolution in pavement material technology. Bitumen has a self-healing naturality relating to temperature, healing time, and aging degree. To date, heat induction and microencapsulation rejuvenator are two feasible approaches, which have been put into real applications. However, both methods have disadvantages limiting their practical results and efficiency. It will be an ideal method combining the advantages and avoiding the disadvantages of the above two methods at the same time. The aim of this work was to synthesize and characterize electrothermal self-healing microcapsules containing bituminous rejuvenator with graphene/organic nanohybrid structure shells. The microcapsules owned electric conductivity capability because of the advent of graphene, and realized the self-healing through the two approaches of heat induction and rejuvenation. The microcapsule shells were fabricated using a strength hexamethoxymethylmelamine (HMMM) resin and graphene by two-step hybrid polymerization. Experimental tests were carried out to character the morphology, integrity, and shell structure. It was found that the electric charge balance determined the graphene/HMMM microstructure. The graphene content in shells could not be greatly increased under an electrostatic balance in emulsion. X-ray photoelectron spectroscopy (XPS), Energy dispersive spectrometer (EDS), Transmission electron microscope (TEM) and Atomic force microscopy (AFM) results indicated that the graphene had deposited on shells. TGA/DTG tests implied that the thermal decomposition temperature of microcapsules with graphene had increased to about 350 °C. The thermal conductivity of microcapsules had been sharply increased to about 8.0 W/m2·K with 2.0 wt % graphene in shells. At the same time, electrical resistivity of microcapsules/bitumen samples had a decrease with more graphene in bitumen.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Fabrication and Characterization of Novel Electrothermal Self-Healing Microcapsules with Graphene/Polymer Hybrid Shells for Bitumenious Material

Wang

Guo

et al. 2018

Nanomaterials

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“…It indicates that the microcapsules resisted high temperature and strong squeeze during the asphalt samples production process. It is in agreement with the previous conclusions based on microcapsules in pure bitumen …”

Section: Embedded Rejuvenation Encapsulationsupporting

confidence: 93%

“…The microcapsules have been proved to be able to survive under the temperature of 180–200 °C . The results confirmed that the microcapsules are capable of application in hot mix asphalt.…”

Section: Embedded Rejuvenation Encapsulationsupporting

confidence: 53%

Self‐Healing Asphalt Review: From Idea to Practice

García

et al. 2018

Adv Materials Inter

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126

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In recent decades, researchers have revealed the great healing potential of asphalt and proposed various novel methods to inspire and improve the self‐healing capacity of asphalt aimed to prolong the service life of asphalt pavement. In this review, up to date research progresses in induction healing and embedded rejuvenator encapsulation are presented, respectively. Meanwhile, the trial section applications of induction healing and capsule healing are highlighted, which show promising results. Finally, some recommendations for the future development of self‐healing asphalt are proposed.

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“…Although it has a certain self-healing ability, it will develop into a macro crack under the action of continuous traffic load [ 7 , 8 , 9 , 10 ]. In view of this, bitumen containing various capsules with self-healing property to prolong its service life has been widely investigated [ 11 , 12 , 13 , 14 , 15 ]. However, synthesis of those capsules generally has some disadvantages: limited encapsulation, high cost, and complex synthesis process.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic Synthesis of Ca-Alginate Microcapsules for Self-Healing of Bituminous Binder

Shu

Dong

et al. 2018

Materials

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This work aims to develop an original alginate micro-emulsion combining with droplets microfluidic method to produce multinuclear Ca-alginate microcapsules containing rejuvenator for the self-healing of bituminous binder. The sizes of the Ca-alginate microcapsules could be easily controlled by tuning flow rates of the continuous and dispersed phases. The addition of a surfactant Tween80 not only improved the stability of the emulsion, but it also effectively reduced the size of the microcapsules. Size predictive mathematical model of the microcapsules was proposed through the analysis of fluid force. Optical microscope and remote Fourier infrared test confirmed the multinuclear structure of Ca-alginate microcapsules. Thermogravimetric analysis showed that the microcapsules coated with nearly 40% rejuvenator and they remained intact during the preparation of bitumen specimen at 135 °C. Micro self-healing process of bituminous binder with multinuclear Ca-alginate microcapsules containing rejuvenator was monitored and showed enhanced self-healing performance. Tensile stress-recovery test revealed that the recovery rate increased by 32.08% (in the case of 5% microcapsules), which meant that the Ca-alginate microcapsules containing rejuvenator could effectively enhance the self-healing property of bituminous binder.

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Fabrication and characterization of self-healing microcapsules containing bituminous rejuvenator by a nano-inorganic/organic hybrid method

Cited by 36 publications

References 23 publications

Fabrication and Characterization of Novel Electrothermal Self-Healing Microcapsules with Graphene/Polymer Hybrid Shells for Bitumenious Material

Fabrication and Characterization of Novel Electrothermal Self-Healing Microcapsules with Graphene/Polymer Hybrid Shells for Bitumenious Material

Self‐Healing Asphalt Review: From Idea to Practice

Microfluidic Synthesis of Ca-Alginate Microcapsules for Self-Healing of Bituminous Binder

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