Surface modification of self-healing poly(urea-formaldehyde) microcapsules using silane-coupling agent

Li, Haiyan; Wang, Rongguo; Hu, Honglin; Liu, Wenbo

doi:10.1016/j.apsusc.2008.06.170

Cited by 186 publications

(89 citation statements)

References 17 publications

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“…PMMA was prepared in the laboratory by bulk polymerization method using azobisisobutyronitrile (AIBN) as initiator, methyl methacrylate (MMA) as monomer and methanol as coagulant. The average molecular weight of the prepared polymer was determined by GPC analysis: M n = 5.38·10 5 and M w = 8.75·10 5 daltons with polydispersity index of 1.6.…”

Section: Experimental 21 Materialsmentioning

confidence: 99%

“…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%

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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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Section: Experimental 21 Materialsmentioning

confidence: 99%

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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“…4), which is important, for example, when fabricating thin self-healing coatings. In other reports, epoxy matrix/microcapsule adhesion was enhanced by grafting either silane coupling agents 90 or epoxy functional groups 91 to the surface of the ureaformaldehyde capsules. One especially interesting variant of these systems was a binary capsule consisting of a large, DCPD filled microcapsule (y140 mm) with smaller capsules (y1?4 mm) containing a second, different liquid at the periphery of the larger capsule 92 ( Fig.…”

Section: Microcapsule Optimisationmentioning

confidence: 93%

Self-healing polymers and composites

Mauldin¹,

Kessler²

2010

International Materials Reviews

235

136

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Inspired by the unique and efficient wound healing processes in biological systems, several approaches to develop synthetic polymers that can repair themselves with complete, or nearly complete, autonomy have recently been developed. This review aims to survey the rapidly expanding field of self-healing polymers by reviewing the major successful autonomic repairing mechanisms developed over the last decade. Additionally, we discuss several issues related to transferring these self-healing technologies from the laboratory to real applications, such as virgin polymer property changes as a result of the added healing functionality, healing in thin films v. bulk polymers, and healing in the presence of structural reinforcements.

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“…The solid shells are most commonly made of urea-formaldehyde [8][9][10] or PMF [10][11][12] as these substances meet all the necessary requirements in most cases. Much emphasis is on the self-healing ability of polymers [13] and even polymer composites [14] involving two components, while the possibility of self-marking [15] is less pronounced in literature.…”

Section: Introductionmentioning

confidence: 99%

Development of Microcapsules

Vermes

Czigány

2017

MSF

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Abstract. Melamine-formaldehyde (PMF) coated microcapsules were produced with liquid pentaerythritol-tetrakis(3-merkaptopropionate) (PETMP) and UV-sensitive indicator colored PETMP cores. Capsules with an average diameter of 43 μm formed due to the adjustments on magnetic stirring, compound ratios, acidity and reaction time. Reproducible recipe was found to produce colored PETMP filled capsules with yields of 1-10%. Optical microscopic investigations were conducted to follow the formation of the particles, and scanning electron-microscope (SEM) was used to verify that the capsules did not break up as an effect of the brittle failure of the epoxy matrix specimens. Improvement of the shell-matrix adhesion was attempted with silane compounds and investigated with X-ray photoelectron spectroscopy (XPS) and SEM.

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Surface modification of self-healing poly(urea-formaldehyde) microcapsules using silane-coupling agent

Cited by 186 publications

References 17 publications

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

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

Self-healing polymers and composites

Development of Microcapsules

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