Thermal stability of microencapsulated epoxy resins with poly(urea–formaldehyde)

Yuan, Li; Liang, Guozheng; Xie, Jiangjian; Guo, Jing; Li, Lan

doi:10.1016/j.polymdegradstab.2006.04.026

Cited by 78 publications

(29 citation statements)

References 8 publications

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“…The most characteristic absorptions of the uncured epoxy include a band around 910-920 cm -1 [12][13][14] , due to the contraction of the C-C bond and the stretching of both C-O bonds, and a shoulder at 858 cm -1 , due to the stretching of one C-O bond and contraction of the other C-O bond of the epoxide group [4] . After curing, the former band decreases in intensity, shifts to higher values and may even split, whereas the shoulder disappears.…”

Section: Infrared Spectroscopymentioning

confidence: 99%

The effect of acetone addition on the properties of epoxy

et al. 2008

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In this context, the goal of this work is to study the effect of acetone solvent on the curing process as well as on the properties of epoxy matrices. Thus, acetone/epoxy solutions of different acetone concentrations, namely 0.0, 7.0, 10.0 or 13.0 wt.%, were prepared and then subjected to a mild processing route to remove acetone. Viscosimetric, thermogravimetric, tensile and morphological tests were performed in order to evaluate possible changes in the samples. In addition, Fourier transform infrared spectroscopy (FTIR) analyses were also employed in the search for changes in their molecular structure. Experimental MaterialsThe epoxy resin and the hardener used were araldite GY 251 (diglycidylether of bisphenol A, DGEBA, Huntsmann) and aradur HY 956 (Huntsmann), respectively. Acetone (Quimidrol, 99.5% purity) was the chosen solvent. MethodologyA certain amount of acetone (7.0, 10.0, or 13.0% of the resin weight) was added to the resin and the mixture was simultaneously sonicated in a Sonics Vibration (500 W) and magnetically stirred for an hour. The mixture was then subjected to heating at 50 °C for an hour and conditioned under vacuum for five hours. Finally, hardener was added to the mixture with a 5:1 (w/w) epoxy resin:hardener ratio and homogenized. The curing process took place at room tempera-

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Section: Infrared Spectroscopymentioning

confidence: 99%

The effect of acetone addition on the properties of epoxy

et al. 2008

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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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“…Liu et al [13] demonstrated that a mixture of DCPD and 5-ethylidene-2-norbornene (mol ratio ¼ 1:3) can also be used as a potential candidate for a healing agent. Epoxy resins [14,15], isocyanate [16], and styrene [17] can also be used as the healing agent in the self-healing process.…”

Section: Autonomically Self-healing Polymeric Materialsmentioning

confidence: 99%

Reversible cross-linking polymer-based self-healing materials

Wang

2015

Recent Advances in Smart Self-Healing Polymers and Composites

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Thermal stability of microencapsulated epoxy resins with poly(urea–formaldehyde)

Cited by 78 publications

References 8 publications

The effect of acetone addition on the properties of epoxy

The effect of acetone addition on the properties of epoxy

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

Reversible cross-linking polymer-based self-healing materials

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