Preparation and characterization of linseed oil-filled urea–formaldehyde microcapsules and their effect on mechanical properties of an epoxy-based coating

Behzadnasab, M.; Esfandeh, Masoud; Mirabedini, S.M.; Zohuriaan‐Mehr, M. J.; Farnood, Ramin

doi:10.1016/j.colsurfa.2014.05.033

Cited by 96 publications

(55 citation statements)

References 19 publications

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“…It has been reported that functionality, mechanical properties and appearance of microcapsules are affected by their size [29][30][31]. Also, in the case of self-healing coatings, the amount of healing agent available for delivery to the crack area depends on the microcapsule size [31].…”

Section: Microcapsules Characterizationmentioning

confidence: 99%

Preparation of self-healing acrylic latex coatings using novel oil-filled ethyl cellulose microcapsules

Mirabedini

Dutil

Gauquelin

et al. 2015

Progress in Organic Coatings

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a b s t r a c tNovel oil-filled microcapsules were prepared by introducing a phase separation method using ethyl cellulose as a shell-forming containing rapeseed oil. The prepared oil-filled microcapsules were evaluated by optical microscopy, scanning electron microscopy and particle size analysis. Results showed that spherical microcapsules with a diameter of 10 to 45 m and a rough porous shell were obtained. Carboxylated styrene/butadiene copolymer latex films containing various levels of these microcapsules were subjected to various levels of pre-elongation and their tensile properties were examined. The addition of oil-filled microcapsules resulted in a significant improvement in the modulus, strain-to-break, and toughness of the films. The self-healing mechanism of latex films was examined through the colorimetric measurements of the release of dye-containing following the pre-elongation of the samples. These measurements confirmed that pre-elongation of samples resulted in the release of oil within the latex films, hence plasticizing the surrounding polymeric network and partly restoring the mechanical properties of the pre-elongated films.

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Section: Microcapsules Characterizationmentioning

confidence: 99%

Preparation of self-healing acrylic latex coatings using novel oil-filled ethyl cellulose microcapsules

Mirabedini

Dutil

Gauquelin

et al. 2015

Progress in Organic Coatings

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“…These microcapsules can be used in the development of polymer self-healing composites for various applications such as aerospace, automotive, marine and building components etc. Currently, urea and melamineformaldehyde are the predominant shell wall materials in the preparation of such microcapsules [1][2][3][4][5][6][7][8][9][10][11][12]. However, the use of both shell wall materials has their own limitations and challenges.…”

Section: Introductionmentioning

confidence: 99%

Parametric study for epoxy loaded PMMA microcapsules using Taguchi and ANOVA methods

Sharma¹,

Choudhary²

2017

Express Polym. Lett.

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Abstract. In this study, we systematically investigated the effect of various process parameters, such as surfactant concentration, core-to-shell ratio taken in the initial feed, temperature and agitation speed on the core content of microcapsules. For this study epoxy loaded poly(methyl methacrylate) microcapsules were prepared by solvent evaporation method. Taguchi orthogonal array with L 25 matrix was implemented to optimize the experimental parameters for such microcapsules. The signal-to-noise ratio (SNR) and analysis of variance (ANOVA) were also performed to determine the optimum parameters and significance of various parameters. Morphological characterization (optical microscopy, scanning electron microscopy and transmission electron microscopy) and particle size analysis (mean particle size and particle size distribution) was done to investigate the effect of various parameters on the prepared microcapsules. SNR analysis identified the optimum levels of various parameters as: surfactant concentration-10 wt%, core-to-shell ratio-3:1, temperature-40°C and agitation speed-300 rpm. ANOVA analysis showed that surfactant concentration was the most significant parameter in improving the core content of such microcapsules. The findings of Taguchi method were also verified with contour plots. Maximum core content obtained under optimum conditions was 63.53 wt% and such microcapsules can find applications for the development of self-healing polymer composites.

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“…In contrast to it, core-shell capsules with special core materials form a novel insulating coating layer that prevent further connections to corrosive media. The mechanical properties of the microcapsules-embedded coatings are somewhat weaker according to pulloff- [13], adhesion- [14] or tensile tests [15]. In the literature there are several papers on preparation of core-shell microcapsules with various core materials: linseed oil [13,15,16,17,18,19,20], tung oil [21], two-component epoxy hardeners [22], water reactive silyl esters [23], methyl methacrylate [24], dicyclopentadiene [23,25,26,27] etc.…”

Section: Introductionmentioning

confidence: 99%

Linseed oil-filled microcapsules containing drier and corrosion inhibitor – Their effects on self-healing capability of paints

Szabó

Telegdi

Nyikos

2015

Progress in Organic Coatings

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Core-shell microcapsules of urea-resorcinol-formaldehyde shell and linseed oil (LO) core material as paint additives for self-healing coatings were prepared. The capsules contained LO either with or without Co-octoate as drier material and/or octadecylamine (ODA) as corrosion inhibitor. The microcapsules embedded in a commercial paint were applied on sandblasted mild steel sheets. After scratching the coated surface, the inhibition efficiency of core-shell microcapsule-containing coat, dipped into corrosive media, was followed visually and evaluated numerically by electrochemical impedance spectroscopy (EIS). In separate experiments, to optimize for the self-healing process, the composition of the core material, the effect of the drier and/or the inhibitor ODA on drying process of LO films were monitored by infrared spectroscopy. Pure LO needed 6-7 days to dry completely. The drying period could be shortened (to 5 h) via application of a dryer, but the addition of the corrosion inhibitor alone increased significantly the time needed for solifidicaiton. To minimize the drying period we have found the proper combination of the ODA and the dryer of the LO. The EIS measurements, in accordance with the drying tests, resulted in the next order of selfhealing ability: LO

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Preparation and characterization of linseed oil-filled urea–formaldehyde microcapsules and their effect on mechanical properties of an epoxy-based coating

Cited by 96 publications

References 19 publications

Preparation of self-healing acrylic latex coatings using novel oil-filled ethyl cellulose microcapsules

Preparation of self-healing acrylic latex coatings using novel oil-filled ethyl cellulose microcapsules

Parametric study for epoxy loaded PMMA microcapsules using Taguchi and ANOVA methods

Linseed oil-filled microcapsules containing drier and corrosion inhibitor – Their effects on self-healing capability of paints

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