INVESTIGADORES
RIVERO Guadalupe
congresos y reuniones científicas
Título:
Microcapsules with melamine-formaldehyde shell
Autor/es:
RIVERO GUADALUPE; RAMACHANDRAN DHANYA ; TEIXEIRA ROBERTO; SCHRYVERS DOMINIQUE; CAKIR SEDA; DU PREZ FILIP E.
Lugar:
Gent
Reunión:
Conferencia; Belgian Polymer Group 2014; 2014
Institución organizadora:
Universiteit Gent
Resumen:
Thermoset materials undergo damages over time due to external forces that can eventually lead to the formation of cracks, thereby deteriorating and weakening the materials. The development of self-healing materials has gained considerable attention over the last decade. The application fields include building and construction, automotive and aerospace, industrial applications, wind energy, marine applications, etc. One of the most studied approaches involves the use of microcapsules as reservoirs for self-healing compounds, dispersed into materials. Deterioration and weakening of materials lead to the formation of cracks and microcapsules in the matrix should break and release their reactive liquid content, allowing the material to recover its strength. In self-healing composites, for capsules to rupture in a reliable fashion, they must have an effective embedded modulus lower than that of the surrounding polymer matrix.
The synthetic routes for the formation of core-shell structures involve mainly the emulsification of the active agent into an immiscible phase upon mechanical stirring and the shell formation by dispersion polycondensation of a prepolymer onto the droplet surface. Melamine-formaldehyde (MF) microcapsules that result from the polycondensation reaction of melamine and formaldehyde have gained interest because of their good mechanical properties.
The capsules need to survive the processing conditions, but they should be broken when the material is damaged. For that reason, the characterization of the capsules using Focussed Ion Beam (FIB), provides useful information for the regulation of the shell strength (thickness and flexibility). Microcapsules with MF shell containing cyclohexane were prepared and characterized in this work.