Produção Nacional
Revisado por pares
Influence of synthesis parameters on properties and characteristics of poly (urea-formaldehyde) microcapsules for self-healing applications
2019; Taylor & Francis; Volume: 36; Issue: 4 Linguagem: Inglês
10.1080/02652048.2019.1638462
ISSN1464-5246
AutoresAna Cláudia Medeiros de Carvalho, Evans Paiva da Costa Ferreira, M.R.D. Bomio, José Daniel Diniz Melo, Ana Paula Cysne Barbosa, Maria Carolina Burgos Costa,
Tópico(s)Antimicrobial agents and applications
ResumoPoly(urea-formaldehyde) (PUF) microcapsules filled with dicyclopentadiene (DCPD) were prepared by in situ polymerisation and the effect of synthesis parameters, such as pH of the solution and agitation rate, on microcapsules size and shell thickness was evaluated. Scanning electron microscopy (SEM) and Fourier transform infra-red spectroscopy (FTIR) were performed. Adjusted pH conditions (pH = 3.5) and agitation rate (1350 RPM) were found using a design of experiments (DOE). SEM results indicated that microcapsule size was directly affected by agitation rate, whereas shell thickness was mostly affected by pH. After obtaining adjusted synthesis conditions, microcapsules presenting mean size of 60 µm and mean shell thickness of 4 µm were embedded in an epoxy matrix for evaluating the self-healing effect. FTIR and SEM analyses in damaged samples suggested that a healing agent was delivered to the crack location.
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