Versatility of the microencapsulation technique via integrating microfluidic T-Junction and interfacial polymerization in encapsulating different polyamines

Yang, Zhitao; Fang, Xinglei; Peng, Junjie; Cao, Xianwu; Liao, Zicen; Yan, Zhibin; Jiang, Chuanxia; Liu, Bin; Zhang, H.

doi:10.1016/j.colsurfa.2020.125097

Cited by 19 publications

(11 citation statements)

References 39 publications

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“…To further increase the compactness of the outer wall, C10 in the reaction solution was completely substituted by C16 to reduce the polarity of the reaction solution. Similar to the previous study, [ 36 , 37 , 40 ] the newly collected microcapsules were dry and free-flowing; however, they gradually became wet during their storage. Figure 6 shows the appearance of the microcapsules fabricated by using 50C10–50C16 and pure C16 as the solvent of the reaction solution.…”

Section: Resultssupporting

confidence: 80%

“…However, it also reduces the production efficiency of the microencapsulation technique to fabricate microcapsules. According to our previous studies, [36,37] the use of smaller tubing to feed polyamines can also generate smaller droplets and thus prepare small-size polyamine microcapsules. To further reduce the microcapsule size, in principle, we can still use the T-junction T1/T2 by further reducing the feeding rate of the polyamine.…”

Section: Figurementioning

confidence: 99%

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Fabrication and Property Regulation of Small-Size Polyamine Microcapsules via Integrating Microfluidic T-Junction and Interfacial Polymerization

Lai¹,

He²,

Xiong³

et al. 2021

Materials

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The self-healing system based on microencapsulated epoxy-amine chemistry is currently the self-healing system with the most practical application potential. It can be widely used in many epoxy-based materials with a size restriction for the microcapsules, such as fiber-reinforced composites, anti-corrosion coatings, etc. Although epoxy microcapsules of different sizes can be fabricated using different techniques, the preparation of polyamine microcapsules with suitable sizes and good performance is the prerequisite for further developing this self-healing system. In this investigation, based on the novel microencapsulation technique via integrating microfluidic T-junction and interfacial polymerization, the feasibility of preparing small-size polyamine microcapsules and the process regulation to optimize the properties of the small-size microcapsules were studied. We show that polyamine microcapsules with sizes smaller than 100 μm can be obtained through the T-junction selection and the feeding rate control of the polyamine. To regulate the small-size microcapsules’ quality, the effects of the concentration of the shell-forming monomer and the solvent with different polarity in the reaction solution and the reaction condition were studied. It shows that dry, free-flowing small-size microcapsules can still be obtained when the shell-forming monomer concentration is higher and the solvent’s polarity is lower, compared with the preparation of larger polyamine microcapsules. Although the change of reaction conditions (reaction temperature and duration) has a certain effect on the microcapsules’ effective core content, it is relatively small. The results of this investigation further promote the potential application of the self-healing systems based on microencapsulated epoxy-amine chemistry in materials with a size restriction for the microcapsules.

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Section: Resultssupporting

confidence: 80%

Section: Figurementioning

confidence: 99%

Fabrication and Property Regulation of Small-Size Polyamine Microcapsules via Integrating Microfluidic T-Junction and Interfacial Polymerization

Lai¹,

He²,

Xiong³

et al. 2021

Materials

Self Cite

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“…The amine microcapsules (Am-MCs) were fabricated using a microencapsulation technique based on directly microencapsulating non-equilibrium amine droplets via integrating microfluidic T-junction and interfacial polymerization. 23,31,32 During the microencapsulation process, the amine droplets produced by the microfluidic T-junction flowed into the reaction solution and were immediately enwrapped by polyurea membrane generated by rapid interfacial polymerization between the polyamine in the droplet and HMDI in the reaction solution. Briefly, the amine mixture, consisting of 25.0 wt% TEPA and 75.0 wt% JEFFAMINE T403 (25TEPA75T403), and the co-flow solution, consisting of n-hexadecane with 1.0 wt% surfactant Arlacel P135, were charged into two syringes, respectively, connected to the tubing T1 (inner diameter: 50 μm and outer diameter: 120 μm) and the tubing T2 (inner diameter: 300 μm and outer diameter: 760 μm) of a T-junction unit (T1/T2).…”

Section: Fabrication Of the Amine Microcapsulementioning

confidence: 99%

High‐performance self‐healing anticorrosion epoxy coating based on microencapsulated epoxy‐amine chemistry

Xie,

Cheng,

Zhao

et al. 2023

J of Applied Polymer Sci

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Attributed to the merits of excellent material compatibility, healing performance, and long‐term stability, the self‐healing system based on microencapsulated epoxy‐amine chemistry is a potentially practical self‐healing system for both structural and functional materials. Herein, based on the microencapsulated epoxy‐amine chemistry, a self‐healing anticorrosion coating was successfully developed. This self‐healing coating system was modeled theoretically to explore the factors that influence the crack filling and the self‐healing anticorrosion function. The established quantitative relationship shows that the filling depth of the crack in the coating is proportional to the microcapsule parameters and coating thickness, but inversely proportional to the crack width. Based on the above theoretical model, the effects of various parameters on the anticorrosion performance were experimentally studied. The actual filling of small in‐situ cracks (<100 μm) generated by impact damage was semi‐quantitatively characterized using scanning electron microscopy (SEM). The filling behavior is consistent with the theoretical modeling. After being healed at room temperature for 2 days upon impact damage, the formulated self‐healing coatings were subjected to accelerated corrosion tests in 10 wt% sodium chloride (NaCl) solution for 2 days to observe their anticorrosion behavior. Compared to the neat epoxy coating, all the formulated self‐healing epoxy coatings show evident anticorrosion function. Good self‐healing anticorrosion performance was achieved by adding 10.0 wt% microcapsules with a size of 100–150 μm to the coating with a thickness of 300 μm. The results of this investigation laid a theoretical and technical foundation for the further development of both the self‐healing chemistry and the self‐healing anticorrosion coating.

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“…In the polymerization media, the shell forming components could be polymerized in the bath, rather than the oil-water interface, while the latter is the ideal polymerization site for encapsulation. The formation of large quantities of these polymerized shells which are named as debris, could lead to poor-quality capsules, due to less available material for shell formation, and a more difficult filtration is also observed 5,54 (Table S2). The type and concentration of emulsifiers are also highly important factors for the microencapsulation process.…”

Section: Optimization Of Synthesis and Encapsulation Efficacymentioning

confidence: 99%

Development of a dual capsule self‐healing silicone composite using silicone chemistry and poly(melamine‐urea‐formaldehyde) shells

Allahdini

Jafari

Momen

2021

J of Applied Polymer Sci

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This study aims to develop microcapsules that can be used as room-temperature self-healing agents in silicone-based matrices. A telechelic reactive silanolterminated polydimethylsiloxane (PDMS) as the healing agent, was selected to ensure the homogeneity of the polymeric matrix and encapsulated in poly(melamine-urea-formaldehyde) shells through an in-situ emulsion polymerization technique. To catalyze the polycondensation reaction of the healing agent, dibutyltin dilaurate (DBTL) was encapsulated within the same type of polymeric shell. The synthesized microcapsules were characterized using Fourier-transform infrared spectrometry, optical microscopy, scanning electron microscopy (SEM), and differential scanning calorimetry. The analyses confirmed that the spherical microcapsules with an average size of 56 μm for PDMS-MUF microcapsules and 42 μm for DBTL-MUF microcapsules, with a shell wall thickness of 100-200 nm, and good thermal stability were formed. Therefore, the two-component selfhealing silicone composite was successfully developed using 10:1.2 wt% PDMS: DBTL microcapsules within the silicone matrix. SEM showed the self-healing ability of the silicone matrix by observing the successful healing of microcracks at room temperature. Tensile and trouser tear tests were adopted to assess the selfhealing performance of the elastomeric matrix, showing the self-healing efficiencies of 67% and 55%, respectively.

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Versatility of the microencapsulation technique via integrating microfluidic T-Junction and interfacial polymerization in encapsulating different polyamines

Cited by 19 publications

References 39 publications

Fabrication and Property Regulation of Small-Size Polyamine Microcapsules via Integrating Microfluidic T-Junction and Interfacial Polymerization

Fabrication and Property Regulation of Small-Size Polyamine Microcapsules via Integrating Microfluidic T-Junction and Interfacial Polymerization

High‐performance self‐healing anticorrosion epoxy coating based on microencapsulated epoxy‐amine chemistry

Development of a dual capsule self‐healing silicone composite using silicone chemistry and poly(melamine‐urea‐formaldehyde) shells

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