Self-healing epoxy composites: preparation, characterization and healing performance

Chowdhury, Raqib; Hosur, Mahesh; Nuruddin, Md.; Tcherbi-Narteh, Alfred; Kumar, Ashok; Boddu, Veera M.; Jeelani, Shaik

doi:10.1016/j.jmrt.2014.10.016

Cited by 75 publications

(41 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The peaks that appeared at 3300–3500 cm −1 represented the stretching mode of OH and NH of the urea‐formaldehyde shell. Also, the peaks of 1720, 1460, 1380, and 1033 cm −1 could be attributed to carbonyl group (CO), the stretching mode of CH, CN, and COC of the shell, respectively . Thus, based on the FT‐IR results, the encapsulation of epoxy by the nanosilica‐urea formaldehyde composite shell was confirmed.…”

Section: Resultsmentioning

confidence: 70%

Microcapsulated epoxy resin with nanosilica‐urea formaldehyde composite shell

Ebrahimnezhad‐Khaljiri

Eslami‐Farsani

Chirani

2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this study, the epoxy microcapsules with the nanosilica (0, 1, 2, and 3 wt %)-urea formaldehyde composite shell were synthesized and then characterized by optical microscope (OM), field emission scanning electron microscope (FESEM), Fouriertransform infrared spectroscopy (FT-IR), and thermogravimetric analysis. According to the OM analysis, the without nanosilica microcapsules had the semitransparent structures and equal size distributions. Also, the formation of the microcapsule clusters and rupturing microcapsules in the sample containing 3 wt % nanosilica were observed by OM method. The FESEM analysis showed that without nanosilica, microcapsules had a smooth surface, whereas by increasing the percentage of nanosilica up to 2 wt %, the surface roughness was enhanced. It was also observed that on the surface of the microcapsules without nanosilica, two size ranges of the submicrocapsules with the average diameters of 1.12 μm and 208 nm were formed. By adding 1 wt % nanosilica, three size ranges of submicrocapsules were formed, with the average size of 2.63 μm, 824 and 179 nm. The interesting phenomena in the microcapsules containing 2 and 3 wt % nanosilica were the packing submicrocapsules with the polymeric shell and the formation of the microcapsule clusters, respectively.

show abstract

Section: Resultsmentioning

confidence: 70%

Microcapsulated epoxy resin with nanosilica‐urea formaldehyde composite shell

Ebrahimnezhad‐Khaljiri

Eslami‐Farsani

Chirani

2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Os picos característicos como o estiramento da ligação N-H a 1548 cm -1 , o estiramento da ligação C=O a 1625 cm -1 e o estiramento da ligação C-N a 1230 cm -1 confirmam a formação de poli(ureia-formaldeído). O grupo OH aparece como uma banda larga em ~3320 cm -1 , associada a adsorção de água [9] [19]. [19].…”

Section: Espectroscopia No Infravermelho Por Transformada De Fourier unclassified

“…Os materiais mais utilizados como parede para as microcápsulas são a ureia-formaldeído (PUF) [6,7], melanina-formaldeído (MF) e melanina-ureia-formaldeído (MUF) [8]. Cápsulas produzidas por esses materiais possuem uma resistência mecânica adequada, permanecendo intactas na sua maioria, quando incorporadas na matriz polimérica; contudo, quando ocorre o dano no material, elas são facilmente quebradas deixando o "agente de cicatrização" fluir para o plano da trinca [9].…”

Section: Introductionunclassified

Modificação do diâmetro de microcápsulas de poli(ureia-formaldeído) pelo uso de octanol

et al. 2018

View full text Add to dashboard Cite

RESUMO Em polímeros autorregeneráveis faz-se uso de cápsulas preenchidas com agentes cicatrizantes, cuja parede rompe em função de estímulo externo, liberando e selando as trincas nos materiais. Assim, esse trabalho teve como objetivo avaliar as possíveis mudanças na morfologia e diâmetro de microcápsulas (MC) de poli(ureia-formaldeído) (PUF) pela variação da concentração de octanol. Medidas de microscopia ótica (MO) e microscopia eletrônica de varredura com efeito de campo (FEGSEM) mostraram que o diâmetro das MC e a rugosidade da parede, associada com a formação de nanocápsulas na emulsão, aumentaram conforme a quantidade de octanol adicionada na síntese aumentou. As curvas termogravimétricas (TG) mostraram que as microcápsulas são mais estáveis termicamente comparadas a trabalhos da literatura. Concluiu-se que o uso do octanol contribui para a obtenção de MC de tamanho mais uniforme e com superfície mais lisa.

show abstract

“…SEM has been used to study the surface roughness of microcapsules qualitatively (Chowdhury et al, 2015), but it is not easy to quantify the surface roughness from SEM images. If quantitative characterization of the surface roughness is required, atomic force microscopy (AFM) and interferometry can be used.…”

Section: Microcapsule Surface Roughness and Morphologymentioning

confidence: 99%

Determination of microcapsule physicochemical, structural, and mechanical properties

et al. 2016

View full text Add to dashboard Cite

a b s t r a c tResearch into the fundamental properties of microcapsules and use of the results to develop a wide variety of products in industries such as printing, fast-moving consumer goods, construction, pharmaceuticals, and agrochemicals is a dynamic and ever-progressing field of study. For microcapsules to be effective in providing protection from harsh environments or delivering large payloads, it is essential to have a good understanding of their properties to enable quality control during formulation, storage, and applications. This review aims to outline the commonly used techniques for determining the physicochemical, structural, and mechanical properties of microcapsules, and highlights the interlinked nature of these three areas with respect to the end-use industrial application. This review provides information on techniques that are well supported in the literature, and also examines microcapsule analytical techniques that will become more prevalent as a result of new technological developments or extensions from other areas of study.

show abstract

Self-healing epoxy composites: preparation, characterization and healing performance

Cited by 75 publications

References 15 publications

Microcapsulated epoxy resin with nanosilica‐urea formaldehyde composite shell

Microcapsulated epoxy resin with nanosilica‐urea formaldehyde composite shell

Modificação do diâmetro de microcápsulas de poli(ureia-formaldeído) pelo uso de octanol

Determination of microcapsule physicochemical, structural, and mechanical properties

Contact Info

Product

Resources

About