Synthesis and characterization of poly(urea-formaldehyde) microcapsules containing linseed oil for self-healing coating development

[Display omitted] •A reliable synthesis method is developed to generate stable microcapsules.•Microcapsules are uniformly dispersed in coating matrix characterized by micro-CT.•The self-healing performance is directly observed by Optical microscope and SEM.•The high content of embedded linseed oil e...

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Bibliographic Details
Published inProgress in organic coatings Vol. 105; pp. 99 - 110
Main Authors Lang, Sinuo, Zhou, Qixin
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 01.04.2017
Elsevier BV
Subjects
Chemical synthesis
Coating
Computed tomography
Epoxy coatings
Formaldehyde
Fourier transforms
In-situ polymerization
Infrared analysis
Linseed oil
Microencapsulation
Molecular weight
Polymerization
PUF microcapsule
PVA stabilizer
Scanning electron microscopy
Self healing materials
Self-healing coating
Thermogravimetric analysis
PUF microcapsule
Self-healing coating
In-situ polymerization
PVA stabilizer
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Summary:[Display omitted] •A reliable synthesis method is developed to generate stable microcapsules.•Microcapsules are uniformly dispersed in coating matrix characterized by micro-CT.•The self-healing performance is directly observed by Optical microscope and SEM.•The high content of embedded linseed oil ensures the self-healing function.•The self-healing coating presents excellent healing performance on cracks. In this study, linseed oil was successfully encapsulated in poly(urea-formaldehyde) (PUF) shell via in-situ polymerization to achieve a microcapsule-based self-healing coating. A set of techniques including Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), optical microscope, and scanning electron microscope (SEM) were used to completely characterize the synthesized microcapsules. The effects of the molecular weight of poly(vinyl alcohol) (PVA) stabilizers, stir rates, and reaction temperatures on the property of microcapsules were investigated. Micro-computed tomography (micro-CT) showed a uniform distribution of microcapsules inside the coating matrix. The stable microcapsules with the high content of core materials ensured the self-healing function. By observation from SEM, the self-healing coating showed excellent healing performance upon artificial cracks comparing to the blank epoxy coating.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2016.11.015