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Melamine–Formaldehyde Microcapsules: Micro- and Nanostructural Characterization with Electron Microscopy

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Heidari, Hamed [University of Antwerp, EMAT, Belgium] Rivero, Guadalupe [Ghent University, Belgium] Idrissi, Hosni [UCL] Ramachandran, Dhanya [University of Antwerp, EMAT, Belgium] Cakir, Seda [Ghent University, Belgium] Schryvers, Dominique [University of Antwerp, EMAT, Belgium]

A systematic study has been carried out to compare the surface morphology, shell thickness, mechanical properties, and binding behavior of melamine–formaldehyde microcapsules of 5–30 μm diameter size with various amounts of core content by using scanning and transmission electron microscopy including electron tomography, in situ nanomechanical tensile testing, and electron energy-loss spectroscopy. It is found that porosities are present on the outside surface of the capsule shell, but not on the inner surface of the shell. Nanomechanical tensile tests on the capsule shells reveal that Young’s modulus of the shell material is higher than that of bulk melamine–formaldehyde and that the shells exhibit a larger fracture strain compared with the bulk. Core-loss elemental analysis of microcapsules embedded in epoxy indicates that during the curing process, the microcapsule-matrix interface remains uniform and the epoxy matrix penetrates into the surface micro-porosities of the capsule shells.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2016
Language Anglais
Journal information "Microscopy and Microanalysis" - Vol. 22, no.06, p. 1222-1232 (2016)
Peer reviewed yes
Publisher Cambridge University Press (Cambridge)
issn 1431-9276
e-issn 1435-8115
Publication status Publié
Affiliations UCL - SST/IMMC/IMAP - Materials and process engineering
University of Antwerp - EMAT
Ghent University - Department of Organic and Macromolecular Chemistry, Polymer Chemistry Research Group
Instituto de Investigaciones en Ciencia y Tecnologia de Materiales, Argentina
Vrije Universiteit Brussel - Research Group Electrochemical and Surface Engineering (SURF)
Keywords Transmission electron microscopy ; Melamine formaldehyde ; in situ mechanical TEM ; Electron tomography ; EELS
Links
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Bibliographic reference Heidari, Hamed ; Rivero, Guadalupe ; Idrissi, Hosni ; Ramachandran, Dhanya ; Cakir, Seda ; et. al. Melamine–Formaldehyde Microcapsules: Micro- and Nanostructural Characterization with Electron Microscopy. In: Microscopy and Microanalysis, Vol. 22, no.06, p. 1222-1232 (2016)
Permanent URL http://hdl.handle.net/2078.1/184053