The permeability and stability of microencapsulated epoxy resins

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

doi:10.1007/s10853-006-0606-6

Cited by 51 publications

(33 citation statements)

References 21 publications

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“…This is because at higher agitation rate, shear force is stronger that breaks suspended droplets and forms narrow particle size distribution and microcapsules of smaller size, while at lower agitation rate, the particle size distribution is comparatively broad. [34,37,41] Figure 9 shows the effect of percent loading of core on the particle size and distribution of the synthesized PAMAM-based polyurea microcapsules. Effect of different set parameters on mean diameter is indicated in Table 2.…”

Section: Particle Size Analysismentioning

confidence: 99%

Fabrication of dendritic 0 G PAMAM-based novel polyurea microcapsules for encapsulation of herbicide and release rate from polymer shell in different environment

Hedaoo

Tatiya

Mahulikar

et al. 2013

Designed Monomers and Polymers

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New sequence of microcapsules with dendritic PAMAM-based novel polyurea as shell wall material containing herbicide as a core moiety has been prepared by interfacial polymerization technique. Dendrimer-based polymeric microcapsules were fabricated with aim to study the effect of different reaction parameters such as surfactant dose, core loading, agitation speed, and amount of solvent on particle size, particle size distribution, and appearance of microcapsules. Prepared microcapsules were characterized by FTIR, thermo gravimetric analysis, particle size analysis, scanning electron microscope, and other microscopic technique. In present investigation, surfactant dose of 2.5% with 5 mL of solvent at 400 rpm was found to be optimum for fabrication of stable new polyurea microcapsules containing 1 g of core. The synthesized microcapsules with optimized parameters were evaluated quantitatively for controlled release study by gas chromatography in different environmental conditions. The highest percent release of core was found in acidic conditions compared to that of basic and least in neutral medium.

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Section: Particle Size Analysismentioning

confidence: 99%

Fabrication of dendritic 0 G PAMAM-based novel polyurea microcapsules for encapsulation of herbicide and release rate from polymer shell in different environment

Hedaoo

Tatiya

Mahulikar

et al. 2013

Designed Monomers and Polymers

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“…In previously reported self-healing composites, microcapsules which fulfilled the above capsule requirements were mainly synthesized with a poly(urea-formaldehyde) shell containing endo-dicyclopentadiene (endo-DCPD) [1][2][3][4][5][6][7][8] and epoxy resin [9][10][11][12][13] through in situ emulsion polymerization. Composites using DCPD-filled urea-formaldehyde (UF) microcapsules have exhibited substantial healing ability in monotonic fracture and fatigue.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Melamine‐Urea‐Formaldehyde Microcapsules Containing ENB‐Based Self‐Healing Agents

Liu

Sheng

Lee

et al. 2009

Macro Materials & Eng

118

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Microcapsules for self‐healing applications were produced with a melamine‐urea‐formaldehyde (MUF) polymer shell containing two different healing agent candidates, 5‐ethylidene‐2‐norbornene (ENB) and ENB with 10 wt.‐% of a norbornene‐based crosslinking agent (CL), by in situ polymerization in an oil‐in‐water emulsion. Relatively neat outer surfaces with minor roughness were observed on the MUF microcapsules under optical and scanning electron microscopy. Shell thickness of the capsules ranged from 700 to 900 nm. Particle size analysis of the microcapsules showed narrow size distributions with a mean diameter of 113 µm for ENB‐filled and 122 µm for ENB + CL‐filled microcapsules at an agitation rate of 500 rpm. The microcapsules were found to be thermally stable up to 300 °C and exhibited a 10 to 15% weight loss when isothermally held at 150 °C for 2 h from thermogravimetric analysis. Overall, these MUF microcapsules exhibited superior properties compared to the urea‐formaldehyde (UF) microcapsules used extensively for self‐healing composites to date. In addition, the manufacturing process of MUF microcapsules is much simpler than those made from UF. Additional advantages of MUF microcapsules for self‐healing composites are discussed.magnified image

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“…It was reported that the PUF microcapsules with optimal wall thickness (56±5 !m), diameter (400±50 !m) and surface morphology have the lower permeability and high stability. This makes them applicable to polymers fabricated at higher temperature (<250°C) [35]. However, it was found that the presence of microcapsules caused a reduction in modulus and strength of the matrix [33,24].…”

Section: Polymer Capsules In Epoxy Compositesmentioning

confidence: 99%

‘Containers’ for self-healing epoxy composites and coating: Trends and advances

Vijayan¹,

Al-Maadeed²

2016

Express Polym. Lett.

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Abstract.The introduction of self-healing functionality into epoxy matrix is an important and challenging topic. Various micro/nano containers loaded self-healing agents are developed and incorporated into epoxy matrix to impart self-healing ability. The current report reviews the major findings in the area of self-healing epoxy composites and coatings with special emphasis on these containers. The preparation and use of polymer micro/nano capsules, polymer fibers, hollow glass fibers/bubbles, inorganic nanotubes, inorganic meso-and nano-porous materials, carbon nanotubes etc. as self-healing containers are outlined. The nature of the container and its response to the external stimulations greatly influence the self-healing performance. The self-healing mechanism associated with each type of container and the role of container parameters on self-healing performance of self-healing epoxy systems are reviewed. Comparison of the efficiency offered by different types of containers is introduced. Finally, the selection of containers to develop cost effective and green self-healing systems are mentioned.

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The permeability and stability of microencapsulated epoxy resins

Cited by 51 publications

References 21 publications

Fabrication of dendritic 0 G PAMAM-based novel polyurea microcapsules for encapsulation of herbicide and release rate from polymer shell in different environment

Fabrication of dendritic 0 G PAMAM-based novel polyurea microcapsules for encapsulation of herbicide and release rate from polymer shell in different environment

Synthesis and Characterization of Melamine‐Urea‐Formaldehyde Microcapsules Containing ENB‐Based Self‐Healing Agents

‘Containers’ for self-healing epoxy composites and coating: Trends and advances

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