New Approach for the Synthesis of Nanozirconia Fortified Microcapsules

Li, Chia‐Chen; Yu, Dzu-How; Chang, Shinn‐Jen; Chen, Jiawei

doi:10.1021/acs.langmuir.7b01066

Cited by 9 publications

(3 citation statements)

References 51 publications

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“…Additionally, the mechanical strengths of epoxy samples containing different amounts of microcapsules were measured and are compared in Figure 3d. 22 The inset of Figure 3d illustrates the dimensions of epoxy specimens used for the tensile strength tests; the thickness of the specimens was 100 μm. The pristine epoxy without any embedded microcapsules showed a tensile strength of 31 MPa.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The deagglomeration and improved dispersion of the microcapsules in the epoxy because of the addition of OP can also be observed in the OM image in Figure c (Figures S2 and S3, Supporting Information). Additionally, the mechanical strengths of epoxy samples containing different amounts of microcapsules were measured and are compared in Figure d . The inset of Figure d illustrates the dimensions of epoxy specimens used for the tensile strength tests; the thickness of the specimens was 100 μm.…”

Section: Resultsmentioning

confidence: 99%

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Dispersion of Poly(urea-formaldehyde)-Based Microcapsules for Self-Healing and Anticorrosion Applications

Zhang

Wang

et al. 2019

Langmuir

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An effective dispersant, oleyl phosphate (OP), for the dispersion of poly(urea-formaldehyde)-based microcapsules in a typical epoxy coating material is proposed. Based on electron microscopy observations and rheological and mechanical characterizations, it is observed that the addition of merely 0.5 wt % of OP is sufficient to obtain good dispersion of the microcapsules in the epoxy. In the selfhealing and anticorrosion experiments, a microcapsule content of at least 15 wt % is required to efficiently restore the epoxy matrix and provide corrosion protection to underlying lowcarbon steel when the particles are not dispersed; however, the amount of microcapsules required to obtain good selfhealing and anticorrosion efficiencies can be greatly reduced to only 5 wt % when the microcapsules are dispersed by OP.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Dispersion of Poly(urea-formaldehyde)-Based Microcapsules for Self-Healing and Anticorrosion Applications

Zhang

Wang

et al. 2019

Langmuir

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“…Li et al . also synthesized a nanozirconia‐UF composite shell based on a new approach through the one‐stage method.…”

Section: Introductionmentioning

confidence: 99%

Microcapsulated epoxy resin with nanosilica‐urea formaldehyde composite shell

Ebrahimnezhad‐Khaljiri

Eslami‐Farsani

Chirani

2019

J of Applied Polymer Sci

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In this study, the epoxy microcapsules with the nanosilica (0, 1, 2, and 3 wt %)-urea formaldehyde composite shell were synthesized and then characterized by optical microscope (OM), field emission scanning electron microscope (FESEM), Fouriertransform infrared spectroscopy (FT-IR), and thermogravimetric analysis. According to the OM analysis, the without nanosilica microcapsules had the semitransparent structures and equal size distributions. Also, the formation of the microcapsule clusters and rupturing microcapsules in the sample containing 3 wt % nanosilica were observed by OM method. The FESEM analysis showed that without nanosilica, microcapsules had a smooth surface, whereas by increasing the percentage of nanosilica up to 2 wt %, the surface roughness was enhanced. It was also observed that on the surface of the microcapsules without nanosilica, two size ranges of the submicrocapsules with the average diameters of 1.12 μm and 208 nm were formed. By adding 1 wt % nanosilica, three size ranges of submicrocapsules were formed, with the average size of 2.63 μm, 824 and 179 nm. The interesting phenomena in the microcapsules containing 2 and 3 wt % nanosilica were the packing submicrocapsules with the polymeric shell and the formation of the microcapsule clusters, respectively.

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