Microencapsulation by Interfacial Polymerization

Salaön, Fabien

doi:10.1002/9781118729175.ch5

Cited by 12 publications

(12 citation statements)

References 144 publications

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“…Encapsulation technology has been applied to develop controlled-release types of pesticides for crop protection (31). Several encapsulation processes rely on the in situ polymerization technique and have been assayed briefly by different researchers (32). Nanopesticides consist of either very small particles of a pesticide active component (33).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of natural nanopesticides with the origin of Eucalyptus globulus extract for pest control

Khoshraftar

Safekordi

Shamel

et al. 2019

Green Chemistry Letters and Reviews

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Continued use of chemical insecticides causes toxicity to non-target organisms, pest resistance and environmental pollution around the world. Nanocapsules of botanical insecticides are a suitable alternative for this target. The major constituents of Eucalyptus extract were determined by GC-MS: 1,8-cineole (70.94%) and 1,2-benzenedicarboxylic acid (6.08%). The Characterization of nanocapsule was investigated by dynamic light scattering, Zeta potential, scanning electron microscope, optical microscope and FTIR. The mean particle size distribution of nanocapsule is 380 nm and zeta potential of −26.36 ± 5.31 mV was obtained. It could be observed that nanocapsules have a spherical shape. To determine the insecticides of the nanocapsule with loads Eucalyptus extract was impregnated with concentration (0, 10, 15, 25, 35, 50 mg/ml) for 12, 24 and 48-h after exposure. The results indicated, that over time encapsulation exposure from 12 to 48 h, the highest time was comparatively more susceptible (LC 50 = 14.93 mg/ml).

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Section: Introductionmentioning

confidence: 99%

Synthesis of natural nanopesticides with the origin of Eucalyptus globulus extract for pest control

Khoshraftar

Safekordi

Shamel

et al. 2019

Green Chemistry Letters and Reviews

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“…Several encapsulation processes rely on the in situ polymerization technique, and have been discussed briefly in several reviews. 6,11,23,[33][34][35]41,45 In such processes, a solution of the monomeric or oligomeric wall material is added to the core phase, the latter being dispersed to the desired size ( Figure 3c). Controlled deposition and precipitation of the polymer takes place at the interface by using precipitants, or a change in pH, temperature, or solvent quality.…”

Section: In Situ Polymerizationmentioning

confidence: 99%

“…Amino resin-based MCs have been predominantly prepared from the reaction of urea and/or melamine with formaldehyde. 23,35 As described above, the capsule synthesis is often a twostep process that first proceeds by the preparation of an amino prepolymer solution. Further condensation of the amino resin leads to the formation of a polymeric network that forms at the surface of the dispersed phase.…”

Section: Polycondensation Reactionsmentioning

confidence: 99%

“…Currently, the design of smart or multi-functional materials from MCs represents a promising field for both academic research and industries. 5 Since the first application of microencapsulation technology to the production of carbonless copy paper, 1 many synthetic protocols (well over 200 22,23 ) and applications have been reported. A broad range of core materials has been encapsulated using various wall materials such as organic polymers, fats, waxes, 22,24 and more recently inorganic compounds.…”

Section: Introductionmentioning

confidence: 99%

“…Although many reports exist for the encapsulation of various core materials, few recent articles have reviewed the preparation and application of amino resins. 23,[33][34][35] The complexities of the process render material design challenging, and it has often remained an empirical endeavor. However, renewed interest in the field has shed light on some of the mechanistic details of microencapsulation by in situ polymerization.…”

Section: Introductionmentioning

confidence: 99%

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Microencapsulation byin situPolymerization of Amino Resins

et al. 2017

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By surrounding small droplets with a coating, one can obtain micrometer-size capsules (microcapsules), and combine multiple properties into a single system. This technology has allowed the design of advanced and functional materials. Amino resins are composed principally of urea and/or melamine and formaldehyde, and exhibit advantages as wall-forming materials, such as high mechanical strength and chemical resistance. In this review, a general description of the encapsulation process by in situ polymerization of amino resins is given. Characterization methods, and the influence of the physical and design parameters are discussed. A mechanistic description, and some of the promising avenues of research are also presented.

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Study on functional microcapsules containing catalysts for controlling the curing time and temperature of epoxy resin

Hwang

Jeoung

et al. 2019

J of Applied Polymer Sci

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In this study, functional microcapsules (FMs) were designed for controlling the curing time and temperature of epoxy through modifications to thermally expandable microcapsules. The FMs were prepared with a mixture of liquid hydrocarbons and N,N‐dimethylbenzylamine in the core, and acrylonitrile (AN)—methyl methacrylate copolymer or AN–methacrylate copolymer were used for the shell. Since the FMs were intentionally designed to have thermally vulnerable polymeric shells, the catalyst in the core could be released at the designated temperature. Therefore, FMs do not activate in epoxy at room temperature; rather, the FMs only become functional when the epoxy is cured under a heated atmosphere. Released catalyst at the higher temperature was confirmed by pyrolysis gas chromatography–mass spectrometry and optical microscopy. This study shows that the results will depend on the different compositions of liquid hydrocarbons and catalyst. Particle size of the capsules was changed with different ratio of catalyst and liquid hydrocarbon at the core and type of polymeric shell. Differential scanning calorimetry and rheometer results showed that higher catalyst loading resulted lower in crystalline and shear thickening temperature, respectively. Adhesion strength of epoxy containing FMs was analyzed by lap shear strength in order to detect the void effect due to released gas from the FM. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47499.

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Microencapsulation by Interfacial Polymerization

Cited by 12 publications

References 144 publications

Synthesis of natural nanopesticides with the origin of Eucalyptus globulus extract for pest control

Synthesis of natural nanopesticides with the origin of Eucalyptus globulus extract for pest control

Microencapsulation byin situPolymerization of Amino Resins

Study on functional microcapsules containing catalysts for controlling the curing time and temperature of epoxy resin

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