Microencapsulation of diglycidyl 1,2-cyclohexanedicarboxylate by in situ polymerization: preparation and characterization

Wang, Haiping; Li, Meng-Qiang; Guo, Chang Xin; Hu, Siqian

doi:10.1515/epoly-2015-0027

Cited by 10 publications

(7 citation statements)

References 9 publications

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“…This proves that the chemical structure of prepolymer used as core material does not change at all. The results are consistent with the literature (Wang et al , 2015; An et al , 2014).…”

Section: Resultssupporting

confidence: 93%

Production of thermochromic microcapsulated inks for smart packaging and examination of printability properties

Kandırmaz

Ozcan

Ulusoy

2020

PRT

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Purpose Stimulant-sensitive materials exhibit physical or chemical reversible changes in their properties as a result of environmental variables. One of these materials is thermochromic materials. Materials with thermochromic sensitivity change their color with heat exchange. For this reason, it can be used in many different fields such as security inks. Such substances decompose rapidly by being affected by weather conditions. Furthermore, the particle sizes are larger than normal pigments, and therefore, it is difficult to stabilize thermochromic dyes. Because of all these adverse conditions, thermochromic colorants must be protected before use in the ink. This protection is planned to be provided by the microcapsulation technique. The purpose of this study is to determine the thermochromic printing inks that can be stored stably by microcapsulation technique, to protect it from environmental conditions and the determination of printability parameters. Design/methodology/approach In this study, capsules with a core material of thermochromic dyeing with polyurea formaldehyde (PUF) or poly-phenolmelamine formaldehyde (PMF) shell were synthesized at appropriate pH and temperature using the appropriate solvent and mixing speed. The chemical structure and dimensions of the obtained capsules were examined by ATR-FTIR and scanning electron microscopy, respectively. The produced thermochromic microcapsules were mixed with alkyd resin and mineral oil and screen printing ink was obtained. Printability tests such as surface morphology, color, gloss and light fastness were applied. Findings As a result, it was determined that PMF is not a suitable encapsulation technique for thermochromic dyes under suitable conditions and eliminates thermochromic property by providing heat stability. It was found that PUF microcapsulation can be used in thermochromic dyestuff encapsulation and does not lose the thermochromic property. It has also been found that PUF microcapsules increase the lightfastness and stability of thermochromic dye ink. Originality/value This study provides experimental research on the encapsulation of a thermochromic dye and its use in ink.

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“…This proves that the chemical structure of prepolymer used as core material does not change at all. The results are consistent with the literature (Wang et al , 2015; An et al , 2014).…”

Section: Resultssupporting

confidence: 93%

Production of thermochromic microcapsulated inks for smart packaging and examination of printability properties

Kandırmaz

Ozcan

Ulusoy

2020

PRT

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“…Similar observations have been made for other types of microcapsules, with the spectrum of the core material being very similar to that of the microcapsules. 27,28,53…”

Section: Resultsmentioning

confidence: 99%

“…Many researchers have found that these parameters (such as the pH of the system, 30 core/shell mass ratio 27,29 and rotating speed 25,27 ) have a great influence on the particle size, morphology and thermal stability of microcapsules. According to the results of previous studies, the microcapsules were prefabricated and a basic investigation was conducted.…”

Section: Methodsmentioning

confidence: 99%

“…Currently, there has been considerable focus on the preparation and performance of microcapsules based on MF resin. 25 –29 Salaun et al 30 analysed the influence of the phase volume ratio, surfactant type, stirring speed, pH, reaction temperature and core/shell mass ratio on the properties of microcapsules. The results indicated that optimal synthesis conditions during the emulsion phase are as follows: a pH of 4, temperature of 55°C and volume ratio of 0.42 between Tween 20 and Brij-35.…”

Section: Introductionmentioning

confidence: 99%

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Influence of synthetic conditions on the performance of melamine–phenol–formaldehyde resin microcapsules

Cheng

et al. 2018

High Performance Polymers

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Melamine (M), phenol (P) and formaldehyde (F) were used as raw materials to synthesize a melamine–phenol–formaldehyde resin (MPF) which was used as shell material to prepare a self-healing microcapsule with E-51 epoxy resin as the core, via in situ polymerization. Fourier transform infrared spectroscopy, environmental scanning electron microscopy and laser particle size analysis were used to characterize the surface morphology, structure and properties of the microcapsule. The influence of the reaction conditions on the properties of the microcapsule was investigated by orthogonal testing. The mass ratio between the MPF shell and the epoxy resin core was found to be 1.2:1.0, optimum pH for shell formation was found to be 3, the emulsification speed was 800 r/min, the acidification speed was 400 r/min and the acidification temperature was 60°C. Under these conditions, the prepared microcapsules are regular and spherical with a smooth, dense surface and uniform particle size with a normal distribution. The microcapsules remained well dispersed and did not aggregate. The orthogonal test revealed that the average particle size and yield of the microcapsules are mainly determined by the core/shell mass ratio, whereas the reaction temperature had a greater impact on the core content of the microcapsules. Although the best microcapsule samples showed poor anti-permeability in ethanol, they exhibited good thermal, isothermal and storage stabilities. This indicates that they may be stored at a constant temperature.

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“…Microcapsules containing DGCHD were prepared using the method reported by Wang et al [10]. An average microcapsule diameter of 60 μm and core content of 89.1 wt % were obtained at 11000 rpm emulsifying rate.…”

Section: Raw Materialsmentioning

confidence: 99%

Self-healing Epoxy with Epoxy-amine Dual-capsule Healing System

Wang¹,

Zhu²,

Li³

2017

Proceedings of the 3rd Annual International Conference on Advanced Material Engineering (AME 2017)

Self Cite

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Abstract.A new type of epoxy composite with self-healing functionality was successfully developed in this work. Self-healing is achieved via embedded microcapsules containing diglycidyl 1,2-cyclohexanedicarboxylate(DGCHD)and microcapsules containing modified aliphatic amine(HB-1618) hardener. This paper also investigated the preparation and properties of curing agent microcapsule which was prepared by the solvent evaporation method. Recovery of impact strength is assessed through izod notched impact testing for impact specimens. It was found that the content of both microcapsules largely influenced the healing efficiency at a certain range. As a result, the optimal filling contents of epoxy-containing microcapsules and hardener-containing microcapsules embedded in the epoxy matrix are 6 wt. % and 9 wt. %, offering a ~65.6% healing efficiency. Scanning electron microscope (SEM) photos of fracture surface before and after healing process proved that the healing process was successfully realized.

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Microencapsulation of diglycidyl 1,2-cyclohexanedicarboxylate by in situ polymerization: preparation and characterization

Cited by 10 publications

References 9 publications

Production of thermochromic microcapsulated inks for smart packaging and examination of printability properties

Production of thermochromic microcapsulated inks for smart packaging and examination of printability properties

Influence of synthetic conditions on the performance of melamine–phenol–formaldehyde resin microcapsules

Self-healing Epoxy with Epoxy-amine Dual-capsule Healing System

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